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Deng J, Wei R, Qiu H, Wu X, Yang Y, Huang Z, Miao J, Liu A, Chai H, Cen X, Wang R. Biomimetic zwitterionic copolymerized chitosan as an articular lubricant. Carbohydr Polym 2024; 330:121821. [PMID: 38368102 DOI: 10.1016/j.carbpol.2024.121821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 12/22/2023] [Accepted: 01/11/2024] [Indexed: 02/19/2024]
Abstract
Restoration of the lubrication functions of articular cartilage is an effective treatment to alleviate the progression of osteoarthritis (OA). Herein, we fabricated chitosan-block-poly(sulfobetaine methacrylate) (CS-b-pSBMA) copolymer via a free radical polymerization of sulfobetaine methacrylate onto activated chitosan segment, structurally mimicking the lubricating biomolecules on cartilage. The successful copolymerization of CS-b-pSBMA was verified by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and 1H nuclear magnetic resonance. Friction test confirmed that the CS-b-pSBMA copolymer could achieve an excellent lubrication effect on artificial joint materials such as Ti6Al4V alloy with a coefficient of friction as low as 0.008, and on OA-simulated cartilage, better than the conventional lubricant hyaluronic acid, and the adsorption effect of lubricant on cartilage surface was proved by a fluorescence labeling experiment. In addition, CS-b-pSBMA lubricant possessed an outstanding stability, which can withstand enzymatic degradation and even a long-term storage up to 4 weeks. In vitro studies showed that CS-b-pSBMA lubricant had a favorable antibacterial activity and good biocompatibility. In vivo studies confirmed that the CS-b-pSBMA lubricant was stable and could alleviate the degradation process of cartilage in OA mice. This biomimetic lubricant is a promising articular joint lubricant for the treatment of OA and cartilage restoration.
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Affiliation(s)
- Junjie Deng
- Cixi Biomedical Research Institute, Wenzhou Medical University, Zhejiang 315300, PR China; Zhejiang International Scientific and Technological Cooperative Base of Biomedical Materials and Technology, Institute of Biomedical Engineering, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China; Ningbo Cixi Institute of Biomedical Engineering, Ningbo 315300, PR China
| | - Rufang Wei
- Cixi Biomedical Research Institute, Wenzhou Medical University, Zhejiang 315300, PR China; Zhejiang International Scientific and Technological Cooperative Base of Biomedical Materials and Technology, Institute of Biomedical Engineering, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China; Ningbo Cixi Institute of Biomedical Engineering, Ningbo 315300, PR China
| | - Haofeng Qiu
- Zhejiang International Scientific and Technological Cooperative Base of Biomedical Materials and Technology, Institute of Biomedical Engineering, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China; Ningbo Cixi Institute of Biomedical Engineering, Ningbo 315300, PR China; School of Materials Science and Engineering, Nanjing University of Science & Technology, Nanjing 210094, PR China
| | - Xiang Wu
- Ningbo Medical Center Li Huili Hospital; Health Science Center, Ningbo University, Ningbo 315000, PR China
| | - Yanyu Yang
- Cixi Biomedical Research Institute, Wenzhou Medical University, Zhejiang 315300, PR China; Zhejiang International Scientific and Technological Cooperative Base of Biomedical Materials and Technology, Institute of Biomedical Engineering, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China; Ningbo Cixi Institute of Biomedical Engineering, Ningbo 315300, PR China
| | - Zhimao Huang
- Zhejiang International Scientific and Technological Cooperative Base of Biomedical Materials and Technology, Institute of Biomedical Engineering, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China; Ningbo Cixi Institute of Biomedical Engineering, Ningbo 315300, PR China
| | - Jiru Miao
- Zhejiang International Scientific and Technological Cooperative Base of Biomedical Materials and Technology, Institute of Biomedical Engineering, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China; Ningbo Cixi Institute of Biomedical Engineering, Ningbo 315300, PR China
| | - Ashuang Liu
- Cixi Biomedical Research Institute, Wenzhou Medical University, Zhejiang 315300, PR China; Zhejiang International Scientific and Technological Cooperative Base of Biomedical Materials and Technology, Institute of Biomedical Engineering, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China; Ningbo Cixi Institute of Biomedical Engineering, Ningbo 315300, PR China
| | - Haiyang Chai
- Cixi Biomedical Research Institute, Wenzhou Medical University, Zhejiang 315300, PR China; Zhejiang International Scientific and Technological Cooperative Base of Biomedical Materials and Technology, Institute of Biomedical Engineering, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China; Ningbo Cixi Institute of Biomedical Engineering, Ningbo 315300, PR China
| | - Xiao Cen
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Sichuan University, Chengdu, 610041, Sichuan, PR China; Department of Temporomandibular Joint, West China Hospital of Stomatology, Sichuan University, No. 14, 3rd Section, South Renmin Road, Chengdu, 610041, Sichuan, PR China.
| | - Rong Wang
- Cixi Biomedical Research Institute, Wenzhou Medical University, Zhejiang 315300, PR China; Zhejiang International Scientific and Technological Cooperative Base of Biomedical Materials and Technology, Institute of Biomedical Engineering, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China; Ningbo Cixi Institute of Biomedical Engineering, Ningbo 315300, PR China.
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Bui HL, Su YH, Yang CJ, Huang CJ, Lai JY. Mucoadhesive, antioxidant, and lubricant catechol-functionalized poly(phosphobetaine) as biomaterial nanotherapeutics for treating ocular dryness. J Nanobiotechnology 2024; 22:160. [PMID: 38589911 PMCID: PMC11000383 DOI: 10.1186/s12951-024-02448-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2024] [Accepted: 03/30/2024] [Indexed: 04/10/2024] Open
Abstract
Dry eye disease (DED) is associated with ocular hyperosmolarity and inflammation. The marketed topical eye drops for DED treatment often lack bioavailability and precorneal residence time. In this study, we investigated catechol-functionalized polyzwitterion p(MPC-co-DMA), composed of 2-methacryloyloxyethyl phosphorylcholine (MPC) and dopamine methacrylamide (DMA) monomers, as potential topical nanotherapeutics for DED. The copolymers were synthesized via random free-radical copolymerization, producing different proportions of catecholic functionalization. All as-prepared polymer compositions displayed good ocular biocompatibility. At a feeding ratio of 1:1, p(MPC1-co-DMA1) can facilitate a robust mucoadhesion via Michael addition and/or Schiff base reaction, thus prolonging ocular residence time after 4 days of topical instillation. The hydration lubrication of MPC and radical-scavenging DMA endow the nano-agent to ease tear-film hyperosmolarity and corneal inflammation. A single dose of p(MPC1-co-DMA1) (1 mg/mL) after 4 days post-instillation can protect the cornea against reactive oxygen species, inhibiting cell apoptosis and the over-expression of pro-inflammatory factors (IL-6 and TNF-α). In clinical assessment, DED-induced rabbit eyes receiving p(MPC1-co-DMA1) could increase lacrimal fluid secretion by 5-fold higher than cyclosporine A. The catechol-functionalized polyzwitterion with enhanced lubricity, mucoadhesion, and anti-oxidation/anti-inflammation properties has shown high promise as a bioactive eye drop formulation for treating DED.
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Affiliation(s)
- Hoang Linh Bui
- Department of Biomedical Sciences and Engineering, National Central University, Taoyuan, 32023, Taiwan
| | - Yun-Han Su
- Department of Biomedical Engineering, Chang Gung University, Taoyuan, 33302, Taiwan
| | - Chia-Jung Yang
- Department of Biomedical Engineering, Chang Gung University, Taoyuan, 33302, Taiwan
| | - Chun-Jen Huang
- Department of Chemical and Materials Engineering, National Central University, Taoyuan, 32023, Taiwan.
- R&D Center for Membrane Technology, Chung Yuan Christian University, Taoyuan, 32023, Taiwan.
- NCU-Covestro Research Center, National Central University, Taoyuan, 32023, Taiwan.
| | - Jui-Yang Lai
- Department of Biomedical Engineering, Chang Gung University, Taoyuan, 33302, Taiwan.
- Department of Ophthalmology, Chang Gung Memorial Hospital, Linkou, 33305, Taoyuan, Taiwan.
- Department of Materials Engineering, Ming Chi University of Technology, New Taipei City, 24301, Taiwan.
- Research Center for Chinese Herbal Medicine, College of Human Ecology, Chang Gung University of Science and Technology, Taoyuan, 33303, Taiwan.
- Center for Biomedical Engineering, Chang Gung University, Taoyuan, 33302, Taiwan.
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Pockle R, Masareddy R, Bambulkar V, Desai R, Kiran S. Exploring magnesium myristate for its dual functionality as a binder and lubricant in the formulation of tablet. Ther Deliv 2024; 15:253-266. [PMID: 38420754 DOI: 10.4155/tde-2023-0101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2024] Open
Abstract
Purpose: To explore 'magnesium myristate' for its dual functionality as a lubricant and binder in the formulation of tablets. Methods: Using (DoE), tablet formulations using magnesium myristate and conventional excipients (magnesium stearate and PVP K30) were developed by wet granulation technique. The prepared granules and formulated tablets were evaluated for pre- and post-compression parameters, respectively. Results: Magnesium myristate exhibited excellent flow properties. The optimized formulations containing magnesium myristate exhibited increased hardness and in vitro drug release in comparison to conventional excipients. f2 similarity index for in vitro drug release showed no significant variations with optimized formulations and with the marketed formulations. Conclusion: Magnesium myristate shows a promising replacement for conventional excipients as both a lubricant and binder in tablet formulation.
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Affiliation(s)
- Rachana Pockle
- Department of Pharmaceutics, KLE College of Pharmacy, KLE Academy of Higher Education & Research, Nehru Nagar, Belagavi - 590010, Karnataka, India
| | - Rajashree Masareddy
- Department of Pharmaceutics, KLE College of Pharmacy, KLE Academy of Higher Education & Research, Nehru Nagar, Belagavi - 590010, Karnataka, India
| | | | | | - Sai Kiran
- Department of Pharmaceutics, KLE College of Pharmacy, KLE Academy of Higher Education & Research, Nehru Nagar, Belagavi - 590010, Karnataka, India
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Gong C, Cui L, Xiong D, Ding Y. In vitro drug release and cartilage interface lubrication properties of biomimetic polymers. J Mech Behav Biomed Mater 2024; 152:106439. [PMID: 38325166 DOI: 10.1016/j.jmbbm.2024.106439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 01/24/2024] [Accepted: 01/26/2024] [Indexed: 02/09/2024]
Abstract
Osteoarthritis is a degenerative disease that is widely found in the elderly population, with a trend towards a younger age group in recent years. In the early stages of arthritis, patients are treated with hyaluronic acid injections and anti-inflammatory drugs. However, it has been found that hyaluronic acid can only play a supportive role and does not have a lubricating effect, and due to the absence of blood vessels, nerves, and lymphatic vessels in the articular cartilage, the oral anti-inflammatory drugs cannot reach the interface of the inflammatory joints adequately, and the drug utilisation rate is low. Herein, we designed and prepared a brush-like bionic lubricant for joint lubrication and drug loading. The poly(2-methyl-2-oxazoline) branched chain was grafted onto the hyaluronic acid main chain by ring-opening polymerisation and graft polymerisation to form a brush-like bionic lubricin containing multiple hydrophilic groups, which was self-assembled to encapsulate the drug by using its multi-branched special structure for drug loading. The friction behaviour tests on the articular cartilage surface showed that the prepared bionic lubricin has excellent lubrication effect, with a minimum friction coefficient of 0.036 close to the lubrication effect of natural synovial fluid, which is mainly due to the hydrophilic groups on its molecular chain that can adsorb the water molecules and form a hydration layer at the cartilage interface, which plays the role of hydration lubrication. In addition, in vitro drug release studies showed that the synthesised drug-loading biomimetic lubricin had a certain drug release capacity, and the maximum drug release rate could reach 77.8 % at 72 h. The synthesis of this bionic lubricant with dual functions of lubrication and drug release provides a new idea for the treatment of osteoarthritis.
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Affiliation(s)
- Chenyang Gong
- School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210009, Jiangsu, PR China
| | - Lingling Cui
- School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210009, Jiangsu, PR China
| | - Dangsheng Xiong
- School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210009, Jiangsu, PR China.
| | - Yan Ding
- School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210009, Jiangsu, PR China
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Lankowski A, Tollefson D, Sánchez H, Cabello R, Hidalgo J, Mathison MN, Molina Y, Duerr A. Acceptability of venue-based HIV testing and prevention interventions for men who have sex with transgender women and transgender women in Lima, Perú: a formative, qualitative study. HIV Res Clin Pract 2024; 25:2331360. [PMID: 38579280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2024]
Abstract
BACKGROUND Despite being at elevated risk for HIV, men who have sex with transgender women (MSTW) are an overlooked population in the global HIV response. Venue-based HIV interventions have previously had success reaching other HIV priority populations, including transgender women (TW). Similar approaches could be applied for MSTW. OBJECTIVE To evaluate the prospective acceptability of venue-based HIV testing and prevention interventions for MSTW and TW in Lima, Peru. METHODS In this exploratory qualitative study, we conducted in-depth interviews (IDI) and focus group discussions (FGD) with three types of participants: MSTW (7 IDIs, 1 FGD), TW (1 FGD), and owners of social venues frequented by MSTW/TW in Lima (2 IDIs). We elicited participants' attitudes and perceptions related to the following four hypothetical interventions delivered at social venues in Lima: rapid HIV testing; HIV self-test distribution; condom/lubricant distribution; and enrolment in a mobile app supporting HIV prevention. We performed a mixed deductive-inductive thematic analysis using the framework method, then applied the Theoretical Framework of Acceptability to classify the overall acceptability of each intervention. RESULTS Condom/lubricant distribution and app-based HIV prevention information were highly acceptable among all participant types. The two HIV testing interventions had relatively lower acceptability; however, participants suggested this could be overcome if such interventions focused on ensuring discretion, providing access to healthcare professionals, and offering appropriate incentives. CONCLUSIONS Overall, MSTW and TW shared similar favourable attitudes towards venue-based HIV interventions. Venue-based outreach warrants further exploration as a strategy for engaging MSTW and TW in HIV prevention activities.
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Affiliation(s)
- Alexander Lankowski
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center, Seattle, WA, USA
- Department of Global Health, University of Washington, Seattle, WA, USA
| | - Deanna Tollefson
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center, Seattle, WA, USA
| | | | | | | | - Mary N Mathison
- School of Medicine, University of Washington, Seattle, WA, USA
| | - Yamilé Molina
- School of Public Health, University of Illinois Chicago, Chicago, IL, USA
| | - Ann Duerr
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center, Seattle, WA, USA
- Department of Global Health, University of Washington, Seattle, WA, USA
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Tong Z, Gao F, Chen S, Song L, Hu J, Hou Y, Lu J, Leung MKH, Zhan X, Zhang Q. Slippery Porous-Liquid-Infused Porous Surface (SPIPS) with On-Demand Responsive Switching between "Defensive" and "Offensive" Antifouling Modes. Adv Mater 2024; 36:e2308972. [PMID: 37917884 DOI: 10.1002/adma.202308972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 10/31/2023] [Indexed: 11/04/2023]
Abstract
Slippery liquid-infused porous surfaces (SLIPS) have received widespread attention in the antifouling field. However, the reduction in antifouling performance caused by lubricant loss limits their application in marine antifouling. Herein, inspired by the skin of a poison dart frog which contains venom glands and mucus, a porous liquid (PL) based on ZIF-8 is prepared as a lubricant and injected into a silicone polyurethane (SPU) matrix to construct a new type of SLIPS for marine antifouling applications: the slippery porous-liquid-infused porous surface (SPIPS). The SPIPS consists of a responsive antifoulant-releasing switch between "defensive" and "offensive" antifouling modes to intelligently enhance the antifouling effect after lubricant loss. The SPIPS can adjust antifouling performance to meet the antifouling requirements under different light conditions. The wastage of antifoulants is reduced, thereby effectively maintaining the durability and service life of SLIPS materials. The SPIPS exhibits efficient lubricant self-replenishment, self-cleaning, anti-protein, anti-bacterial, anti-algal, and self-healing (97.48%) properties. Furthermore, it shows satisfactory 360-day antifouling performance in actual marine fields during boom seasons, demonstrating the longest antifouling lifespan in the field tests of reported SLIPS coatings. Hence, the SPIPS can effectively promote the development of SLIPS for neritic antifouling.
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Affiliation(s)
- Zheming Tong
- College of Chemical and Biological Engineering, Zhejiang University, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou, 310027, China
| | - Feng Gao
- College of Chemical and Biological Engineering, Zhejiang University, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou, 310027, China
| | - Sifan Chen
- College of Chemical and Biological Engineering, Zhejiang University, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou, 310027, China
| | - Lina Song
- College of Chemical and Biological Engineering, Zhejiang University, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou, 310027, China
| | - Jiankun Hu
- College of Chemical and Biological Engineering, Zhejiang University, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou, 310027, China
| | - Yang Hou
- College of Chemical and Biological Engineering, Zhejiang University, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou, 310027, China
- Zhejiang Provincial Innovation Center of Advanced Chemicals Technology, Quzhou Research Institute, Zhejiang University, Quzhou, 324000, China
| | - Jianguo Lu
- School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Michael K H Leung
- School of Energy and Environment, Ability R&D Energy Research Centre, City University of Hong Kong, Hong Kong, 999077, China
| | - Xiaoli Zhan
- College of Chemical and Biological Engineering, Zhejiang University, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou, 310027, China
- Zhejiang Provincial Innovation Center of Advanced Chemicals Technology, Quzhou Research Institute, Zhejiang University, Quzhou, 324000, China
| | - Qinghua Zhang
- College of Chemical and Biological Engineering, Zhejiang University, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou, 310027, China
- Zhejiang Provincial Innovation Center of Advanced Chemicals Technology, Quzhou Research Institute, Zhejiang University, Quzhou, 324000, China
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Du X, Tong W, Zhou X, Luo J, Liu Y, Wang Y, Li P, Zhang Y. An efficient approach for the treatment of radioactive waste perfluoropolyether lubricants via a synergistic effect of thermal catalysis and immobilization. J Environ Sci (China) 2024; 136:512-522. [PMID: 37923460 DOI: 10.1016/j.jes.2023.02.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 02/16/2023] [Accepted: 02/16/2023] [Indexed: 11/07/2023]
Abstract
Perfluoropolyether (PFPE) lubricants are a kind of high-molecular polymer with many excellent properties. However, the use of PFPEs in the nuclear industry can lead to partial decomposition and carrying radionuclides, resulting in a large amount of radioactive waste PFPE lubricants annually. Moreover, radioactive waste PFPE lubricants are difficult to be effectively treated due to their high stability, the risk of possible leakage of radionuclides, and hypertoxic fluorine-containing by-products. In this study, without any precedent, a strategy of MnO2-catalyzed decomposition and Na2CO3-immobilized conversion was proposed for PFPE lubricant decomposition and fluorine immobilization simultaneously based on the Lewis acid-base and oxygen vacancies concept. A high fluorine conversion efficiency of 95.4% was achieved. Meanwhile, the mechanism of decomposition suggested that MnO2 mainly provided Lewis acid sites and attacked the (basic) fluorine or oxygen atoms in PFPE molecules. The decomposition of PFPE chains was proceed down and volatile fluorine-containing gas was released by partial electron transfer, intramolecular disproportionation reaction, and unzipping fashion. Subsequently, gas by-products could be further oxidized and then immobilized into fluoride salts by carbonate solid absorbents. Overall, this study provides a simple, safe, and potentially practical strategy for the harmless conversion of refractory fluorinated organic wastes, especially perfluoropolymers.
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Affiliation(s)
- Xinhang Du
- Department of Pharmaceutical & Biological Engineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Wenhua Tong
- Department of Pharmaceutical & Biological Engineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Xinyu Zhou
- Department of Pharmaceutical & Biological Engineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Jia Luo
- Department of Pharmaceutical & Biological Engineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Yuqiu Liu
- Department of Pharmaceutical & Biological Engineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Yabo Wang
- Department of Pharmaceutical & Biological Engineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Panyu Li
- Department of Pharmaceutical & Biological Engineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, China.
| | - Yongkui Zhang
- Department of Pharmaceutical & Biological Engineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, China.
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8
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Köhn FM. [Vaginal lubricants and desire for children]. MMW Fortschr Med 2024; 166:56-57. [PMID: 38332294 DOI: 10.1007/s15006-024-3563-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2024]
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9
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Fröhlich M, Schurzig D, Rau TS, Lenarz T. On the interdependence of insertion forces, insertion speed, and lubrication: Aspects to consider when testing cochlear implant electrodes. PLoS One 2024; 19:e0295121. [PMID: 38266033 PMCID: PMC10807833 DOI: 10.1371/journal.pone.0295121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Accepted: 11/14/2023] [Indexed: 01/26/2024] Open
Abstract
OBJECTIVES During the insertion of cochlear implant (CI) electrode arrays, forces occur which may cause trauma and poorer hearing outcomes. Unfortunately, research groups investigating factors influencing insertion forces come to contradicting results, especially regarding insertion speed. This study was conducted to investigate the origin of these contradicting results and to determine how different testing conditions influence experimental findings. METHODS Repeated, automated insertions with three different FLEX28 CI electrode arrays (MED-EL, Innsbruck, Austria) were performed into a newly developed, anatomically correct and 3D-printed mean scala tympani phantom. The testing protocol for each electrode included variations in insertion speed (v = 0.1-2.0 mm/s) and lubrication (90%, 50%, and 10% liquid soap), resulting in 51 insertions per electrode array and a total of 153 insertions. RESULTS The test setup and protocol allowed for repeatable insertions with only minimal change in the morphology of the insertion force profiles per testing condition. Strong but varying dependencies of the maximal insertion forces and work were found regarding both lubrication and speed: work-speed dependency is constant for the 10% lubricant, negative for the 50% lubricant and positive for the 90% lubricant. CONCLUSION Our results can explain part of the contradicting results found within previous studies by translating interrelations known from lubricated rubber friction to the field of CI electrode array insertion. We show that the main driver behind measured bulk forces are most likely the generated friction forces, which are strongly dependent on insertion speed and lubrication. The employed test setup allows for conducting repeatable and comparable insertion studies, which can be recapitulated by other centers due to the detailed explanation of the test setup as well as the developed and freely available insertion phantom. This study hence represents another important step toward standardizing CI array insertion testing.
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Affiliation(s)
- Max Fröhlich
- MED-EL Medical Electronics GmbH, MED-EL Research Center, Hannover, Germany
- Department of Otolaryngology, Hannover Medical School, Hannover, Germany
| | - Daniel Schurzig
- MED-EL Medical Electronics GmbH, MED-EL Research Center, Hannover, Germany
- Department of Otolaryngology, Hannover Medical School, Hannover, Germany
| | - Thomas S. Rau
- Department of Otolaryngology, Hannover Medical School, Hannover, Germany
- Cluster of Excellence EXC 2177/1 “Hearing4all”, Hannover, Germany
| | - Thomas Lenarz
- Department of Otolaryngology, Hannover Medical School, Hannover, Germany
- Cluster of Excellence EXC 2177/1 “Hearing4all”, Hannover, Germany
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Majdoub F, Belin M, Perret-Liaudet J. Ultra-low friction in soft contact lenses: Analysis of dynamic free responses measured by the dynamic oscillating tribometer. J Mech Behav Biomed Mater 2024; 149:106236. [PMID: 37984287 DOI: 10.1016/j.jmbbm.2023.106236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 11/06/2023] [Accepted: 11/08/2023] [Indexed: 11/22/2023]
Abstract
Friction coefficient is considered as a measurement for clinical comfort of soft contact lenses. One of the main challenges in the tribology field is to evaluate the friction in soft materials such as soft contact lenses. In this work, we aim to evaluate the friction at the eyelid-lens contact using a new technique. This technique is based on a single-degree-of-freedom (SDOF) mass-spring system having a sliding contact. The experimental technique measures the free responses of the mechanical system. The friction is then evaluated from the damped free responses with a high accuracy. A variety of soft contact lenses are tested with some lubricants under many physiological conditions. The results are discussed and compared with those in the literature.
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Affiliation(s)
- Fida Majdoub
- LabECAM, ECAM La Salle, Université de Lyon, 69005, Lyon, France.
| | - Michel Belin
- Laboratory of Tribology and System Dynamics, École Centrale de Lyon, UMR CNRS 5513, Université de Lyon, 69134, Écully, France
| | - Joël Perret-Liaudet
- Laboratory of Tribology and System Dynamics, École Centrale de Lyon, UMR CNRS 5513, Université de Lyon, 69134, Écully, France
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Tomlinson J, Pooley K, Tomlinson M. Sperm toxicity testing on lubricant gels: should we be recommending 'fertility-friendly' specialist products? HUM FERTIL 2023; 26:1028-1031. [PMID: 35369832 DOI: 10.1080/14647273.2022.2053214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 02/04/2022] [Indexed: 11/04/2022]
Abstract
Couples trying to conceive or providing samples for Assisted Reproductive Technologies (ART) are advised against the use of lubricant-gels due to the risk of sperm-toxicity. However, gels now exist which are specifically formulated to help couples conceive but without consensus on their toxicity relative to non-specialist products. This study tested gels recently introduced as 'sperm friendly' (FertilSafe Plus, Fertile Check) alongside established lubricants intended for pleasure only using a recently published toxicity testing regime. Computer Assisted Sperm Analysis (CASA) was performed at 1 and 2 h on donor sperm (n = 12) pre-incubated with each gel (10% v/v) and controls. All gels led to a significant loss of motility/velocity at 1 and 2 h (p < 0.01), with the most significant loss from the 2 Durex pleasure products (11% and 15%, vs 47% progression) at 60 min, although these performed better than saliva (used as negative control). Incubation with FertilSafePlus led to the smallest loss of motility (24% vs 47%) at 1 h. Saliva and products designed for lubrication only exhibited the most negative effect on motility and those marketed as 'sperm safe' could be considered the best performers. Whether these affects are due to direct toxicity or are indirect due to other factors such as viscosity, pH or osmolality remains uncertain.
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Affiliation(s)
- Joseph Tomlinson
- Faculty of Medicine and Healthcare Sciences, Nottingham University Hospital, Nottingham, UK
| | - Karen Pooley
- NUH Life Fertility Services, Nottingham University Hospital, Nottingham, UK
| | - Mathew Tomlinson
- NUH Life Fertility Services, Nottingham University Hospital, Nottingham, UK
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Faruk Yilmaz O, Sarmis A, Ali Mutlu M, Büsra Sahin Z, Pelin Kaya S, Oguz H. Bacterial contamination of multi-use tear drops, gels, and ointments. Cont Lens Anterior Eye 2023; 46:102064. [PMID: 37806847 DOI: 10.1016/j.clae.2023.102064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Revised: 09/22/2023] [Accepted: 09/27/2023] [Indexed: 10/10/2023]
Abstract
PURPOSE This study aimed to investigate the bacterial contamination of multi-use tear drops, gels, and ointments that patients use at home. METHOD A total of 271 multi-use containers used by 168 patients were examined. Conjunctival culture samples were obtained from patients who used tear drops, gels, and ointments that were found to be contaminated. RESULTS Bacterial contamination was detected in 33 (12.2 %) out of the 271 containers. The contamination rate was 7.9 % in tear drops, 11.7 % in gels, and 32 % in ointments. A statistically significant difference was found between the drops, gels, and ointment groups (P = 0.04). Bacterial contamination was detected in 25 (18.9 %) out of 132 collapsible tubes and 8 (5.8 %) out of 139 plastic bottles (P = 0.01). Important bacteria, including Pseudomonas stutzeri, Pseudomonas aeruginosa, Bacillus licheniformis, Paenibacillus pabuli, Proteus mirabilis, Pantoea agglomerans, Morganella morganii, Serratia marcescens, and Serratia liquefaciens, were detected. Mucorales spp. fungus was seen in a gel. Staphylococcus epidermidis, methicillin-resistant Staphylococcus aureus, and M. morganii were found in the conjunctival microbiota of three patients. CONCLUSION The overall contamination rate of ocular lubricants was low (12.2%); however, a significant difference was found between the drops, gels, and ointments. The contamination rate was higher in gels and ointments than that in drops. The contamination rate was found to be increased in the collapsible tube. The use of ocular lubricants is safe; however, patients must be cautious when using multi-use tear drops, gels, and ointments to avoid contamination. Whenever possible, bottles should be preferred instead of collapsible tubes.
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Affiliation(s)
- Omer Faruk Yilmaz
- Goztepe Prof. Dr. Süleyman Yalçin City Hospital, Department of Ophthalmology, Istanbul, Turkey.
| | - Abdurrahman Sarmis
- Goztepe Prof. Dr. Süleyman Yalçin City Hospital, Department of Medical Microbiology, Istanbul, Turkey
| | - Muhammed Ali Mutlu
- Fatih Sultan Mehmet Training and Research Hospital, Department of Medical Microbiology, Istanbul, Turkey
| | - Zahide Büsra Sahin
- Istanbul Medeniyet University Faculty of Medicine, Department of Ophthalmology, Istanbul, Turkey
| | - Sabire Pelin Kaya
- Istanbul Medeniyet University Faculty of Medicine, Department of Ophthalmology, Istanbul, Turkey
| | - Halit Oguz
- Istanbul Medeniyet University Faculty of Medicine, Department of Ophthalmology, Istanbul, Turkey
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Borgogna JLC, Grace SG, Holm JB, Aviles Zuniga T, Kadriu H, He X, McCoski SR, Ravel J, Brotman RM, Yeoman CJ. Investigating the impact of condomless vaginal intercourse and lubricant use on the vaginal metabolome: a pre-post observational study. Sex Transm Infect 2023; 99:489-496. [PMID: 37258272 DOI: 10.1136/sextrans-2022-055667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 05/06/2023] [Indexed: 06/02/2023] Open
Abstract
OBJECTIVE The vaginal metabolome is a significant factor in the vaginal microenvironment, and data are emerging on its independent role in urogenital health. Condomless vaginal intercourse and personal lubricant use are common practices that may affect the vaginal metabolome. The aim of the present study is to describe the associations between condomless intercourse and lubricant use on the vaginal metabolome. METHODS This study used archived mid-vaginal swabs from a 10-week observational cohort of reproductive age women who self-collected samples and recorded behavioural diaries daily. Cases and controls were defined as participants who self-reported condomless vaginal intercourse with or without lubricant use, respectively. Samples were drawn prior to and following condomless vaginal intercourse. Twenty-two case participants were race/ethnicity matched to 22 control participants. Mid-vaginal swabs were subjected to 16S rRNA gene amplicon sequencing and untargeted ultrahigh performance liquid chromatography tandem mass spectroscopy metabolomics. Bayesian mixed-effects regression (unadjusted and adjusted for the vaginal microbiota) was used to evaluate differences in metabolite concentration associated with vaginal intercourse and lubricant use. RESULTS Both condomless penile-vaginal intercourse and lubricant use were independently associated with higher (up to 8.3-fold) concentrations of metabolites indicative of epithelial damage (eg, sarcosine) and many host-produced antioxidants. Lubricant use was significantly associated with increases in lipids related to cellular damage, host-produced sphingolipids (antimicrobials), antioxidants and salicylate, a cooling agent common to lubricants, in a study design which controls for the independent effect of intercourse. Metabolites involved in oxidative stress and salicylate were strongly correlated with several molecular bacterial vaginosis-associated bacteria. CONCLUSIONS This study provides important foundational data on how condomless vaginal-penile intercourse and lubricant use affect the vaginal metabolome and may affect the protective mechanisms in the vaginal microenvironment.
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Affiliation(s)
- Joanna-Lynn C Borgogna
- Department of Microbiology and Cell Biology, Montana State University, Bozeman, Montana, USA
- Department of Animal and Range Sciences, Montana State University, Bozeman, Montana, USA
| | - Savannah G Grace
- Department of Animal and Range Sciences, Montana State University, Bozeman, Montana, USA
| | - Johanna B Holm
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Tadeo Aviles Zuniga
- Department of Microbiology and Cell Biology, Montana State University, Bozeman, Montana, USA
| | - Herlin Kadriu
- Department of Microbiology and Cell Biology, Montana State University, Bozeman, Montana, USA
- Department of Animal and Range Sciences, Montana State University, Bozeman, Montana, USA
| | - Xin He
- Department of Epidemiology and Biostatistics, University of Maryland School of Public Health, College Park, Maryland, USA
| | - Sarah R McCoski
- Department of Animal and Range Sciences, Montana State University, Bozeman, Montana, USA
| | - Jacques Ravel
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland, USA
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Rebecca M Brotman
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, Maryland, USA
- Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Carl J Yeoman
- Department of Microbiology and Cell Biology, Montana State University, Bozeman, Montana, USA
- Department of Animal and Range Sciences, Montana State University, Bozeman, Montana, USA
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Gupta A, Mudie LI, Yen MT. Flammability of Ocular Surface Lubricants. Ophthalmic Plast Reconstr Surg 2023; 39:632-635. [PMID: 37486341 DOI: 10.1097/iop.0000000000002469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/25/2023]
Abstract
PURPOSE Surgical fires pose a substantial risk to patients and can cause significant injury, especially in oculofacial surgery. Ocular surface lubricants can potentially act as fuel for an operating room fire. We present an experimental analysis of the flammability of 9 commonly used ophthalmic lubricants under 4 ignition sources used in oculofacial surgery with and without supplemental oxygen. METHODS The flammability of 9 ophthalmic lubricants were tested under various operating room conditions. Each lubricant was exposed to 4 different ignition sources: an open flame lighter, monopolar cautery, bipolar cautery, and hand-held high temperature cautery, and the response of the lubricant was recorded. The testing was conducted both in room air and with 6 L/minute of 100% oxygen directed at the lubricant through a nasal cannula. Any reaction in which there was ignition, sparking, smoking, or a transient or permanent change in appearance of the lubricant was deemed notable. RESULTS Of the 9 lubricants tested, 4 displayed a reaction to the ignition source. Without supplemental oxygen, 100% petrolatum and neomycin-polysporin-bacitracin-hydrocortisone ointment produced some smoke when applied with the high temperature cautery. Notably, under both the conditions of no supplemental oxygen and with the addition of 6 L/minute of 100% oxygen, the carboxymethylcellulose drops and lidocaine jelly both conducted and sparked with the monopolar cautery leaving visible burn marks on the paper. CONCLUSIONS The overall fire hazard posed by ocular surface lubricants is low. Some topical lubricants can conduct electricity from monopolar cautery, which could increase the risk of inadvertent electrical burns. Certain lubricants could potentially become a fuel source when used in combination with hand-held high temperature battery cautery. Bipolar cautery was not associated with either increased conductivity or flammability with any of the lubricants tested.
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Affiliation(s)
- Akash Gupta
- Department of Ophthalmology, Baylor College of Medicine, Houston, Texas, U.S.A
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Santos DMD, Matos MBFOCD, Sousa ARB, Fertusinhos FCDA, Pendás RMC. Effect of Lubricant Use on Cervicovaginal Cytology - What's the Evidence? Rev Bras Ginecol Obstet 2023; 45:e724-e728. [PMID: 38029774 PMCID: PMC10686751 DOI: 10.1055/s-0043-1776025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Accepted: 08/14/2023] [Indexed: 12/01/2023] Open
Abstract
OBJECTIVE To determine if the use of lubricating gel on the speculum during the cervicovaginal cytology examination interferes with the results obtained, as well as whether it reduces reported discomfort in patients. DATA SOURCES A systematic review was carried out according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) recommendations, with a search in the Pubmed/Medline, Scielo, Cochrane Library, Embase databases of articles published between January 2011 and May 2022. The keywords used were cytology, speculum, lubricant, result, and pain. SELECTION OF STUDIES The initial search resulted in 306 articles, of which were excluded three because they were duplicates, 257 after reading the title and abstract and 41 after reading the full text. Thus, five articles were selected for the study: four randomized clinical trials and one metanalysis. DATA COLLECTION The selection of articles was performed by two investigators. The 5 selected articles were read in full and submitted to a comparative analysis. DATA SYNTHESIS Screening through cervicovaginal cytology allows for early diagnosis and reduction of associated mortality, but the procedure can be associated with pain. A small amount of aqueous lubricating gel in the speculum can be used to reduce the discomfort associated with performing cervicovaginal cytology. CONCLUSION The use of lubricating gel in the speculum does not seem to be associated with a change in the cytology result and reduces the discomfort associated with its insertion into the vagina.
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16
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Sun X, Zhou J, Xu K, Wu W, Xu L, Jiang R, Fang L. Effects of different factors on the friction and wear mechanical properties of titanium alloy materials with cortical bones at near service conditions. PLoS One 2023; 18:e0290346. [PMID: 37856508 PMCID: PMC10586624 DOI: 10.1371/journal.pone.0290346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Accepted: 08/05/2023] [Indexed: 10/21/2023] Open
Abstract
The artificial joint is one of the most effective methods to treat joint injuries. The service performance of artificial joints is gradually weakened because of the wear of artificial joints in actual service. In order to obtain the potential failure mechanism of the artificial joint in actual service, the study was carried out with the multiple factors that affect the service performance of the artificial joint. The experimental study was carried out on the change rule of mechanical behavior of the contact interface between the artificial joint of titanium alloy and cortical bone. The multi-factor is compression load, contact load, friction velocity, and lubrication environment, respectively. The results indicate that the friction coefficient, wear mass, and wear coefficient of Ti-6A1-4V titanium alloy decreased with the increasing of the compression load. The friction rate and the friction coefficient of Ti-6A1-4V titanium alloy decreased with the increasing of the contact load. The wear mass and friction coefficient of Ti-6A1-4V titanium alloy increased with the increasing of contact load. The lubrication effect is better with the increasing of lubricant concentration. Based on the observation of the SEM, the wear type influenced by compression load and friction rate is mainly abrasive wear and oxidation wear. The wear type influenced by contact load is mainly abrasive wear and adhesive wear. The wear type influenced by lubricants is mainly oxidation wear. When wear mass and wear coefficient are used as the criteria for evaluating friction and wear, the order of influential factors to friction and wear of Ti-6Al-4V titanium alloy plate is friction rate, compression load, contact load, and lubricant concentration. This research can provide a theoretical reference for the optimal manufacture of the artificial joint of titanium alloy and optimal rules of safe service conditions.
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Affiliation(s)
- Xingdong Sun
- School of Engineering, Anhui Agricultural University, Hefei, China
| | - Jianfei Zhou
- School of Engineering, Anhui Agricultural University, Hefei, China
| | - Ke Xu
- School of Engineering, Anhui Agricultural University, Hefei, China
| | - Wandi Wu
- School of Engineering, Anhui Agricultural University, Hefei, China
| | - Liangyuan Xu
- School of Engineering, Anhui Agricultural University, Hefei, China
| | - Rui Jiang
- School of Engineering, Anhui Agricultural University, Hefei, China
| | - Liangfei Fang
- School of Engineering, Anhui Agricultural University, Hefei, China
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17
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Brown SE, Brotman RM. Letter to the Editor on "A randomized trial on the effectiveness and safety of 5 water-based personal lubricants". J Sex Med 2023; 20:1257. [PMID: 37553097 PMCID: PMC10545533 DOI: 10.1093/jsxmed/qdad077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 05/08/2023] [Indexed: 08/10/2023]
Affiliation(s)
- Sarah E Brown
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD 21202, United States
| | - Rebecca M Brotman
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD 21202, United States
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18
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Palacios S, Hood S, Abakah-Phillips T, Savania N, Krychman M. Response to Letter to the Editor on "A randomized trial on the effectiveness and safety of 5 water-based personal lubricants". J Sex Med 2023; 20:1264. [PMID: 37553099 DOI: 10.1093/jsxmed/qdad078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 05/08/2023] [Indexed: 08/10/2023]
Affiliation(s)
| | - Sarah Hood
- Reckitt Benckiser Healthcare UK Ltd, Slough, GB 4021, United States
| | | | - Nina Savania
- Reckitt Benckiser Healthcare UK Ltd, Slough, GB 4021, United States
- Southern California Center for Sexual Health, PO BOX 2718, Newport beach, 92659, United States
| | - Michael Krychman
- Southern California Center for Sexual Health and Survivorship Medicine, 1501 Superior, Newport Beach, 92659, United States
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19
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Puckhaber D, Kwade A, Finke JH. Investigation of Dispersion Kinetics of Particulate Lubricants and their Effect on the Mechanical Strength of MCC Tablets. Pharm Res 2023; 40:2479-2492. [PMID: 37752367 PMCID: PMC10661788 DOI: 10.1007/s11095-023-03602-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 09/01/2023] [Indexed: 09/28/2023]
Abstract
INTRODUCTION Tablets are commonly produced by internally adding particulate lubricants, which are known to possibly lower the mechanical strength of tablets. This reduction is caused by the coverage of matrix forming components by lubricant particles, resulting in decreased interparticulate interactions. The known incompatibilities with some active compounds of the predominantly used lubricant, magnesium stearate, call for the in-depth characterization of alternative lubricants. PURPOSE Investigation of the dispersion behavior of five commonly applied pharmaceutical lubricants by mathematically modeling the dispersion kinetics for short and extended mixing times. METHODS The dispersion behavior of five different pharmaceutical lubricants were examined by systematically varying lubricant concentration and mixing time of binary formulations and evaluating the kinetic of tensile strength reduction by theoretically estimating the surface coverage based on particle sizes. RESULTS For short mixing times, a unifying relationship between compactibility reduction and theoretical surface coverage was identified. Subsequently, for extended mixing times, distinct differences in the shear strength and dispersion kinetics of the investigated lubricants were found. CONCLUSIONS The lubricant particle size controls the tensile strength reduction if short mixing times are applied. For extended mixing times, the investigated lubricants can be divided into two groups in terms of dispersion kinetics. Possible underlying reasons are discussed in detail in order to enhance the general understanding of lubricant dispersions in tablet formulations.
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Affiliation(s)
- Daniel Puckhaber
- Institute for Particle Technology, Technische Universität Braunschweig, Braunschweig, Germany.
- Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, Braunschweig, Germany.
| | - Arno Kwade
- Institute for Particle Technology, Technische Universität Braunschweig, Braunschweig, Germany
- Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, Braunschweig, Germany
| | - Jan Henrik Finke
- Institute for Particle Technology, Technische Universität Braunschweig, Braunschweig, Germany
- Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, Braunschweig, Germany
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Melrose J. Emergence of proteoglycan-4, (lubricin) as a multifunctional, cell instructive, anti-inflammatory boundary lubricant. Bioessays 2023; 45:e2300090. [PMID: 37318319 DOI: 10.1002/bies.202300090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Accepted: 06/02/2023] [Indexed: 06/16/2023]
Affiliation(s)
- James Melrose
- Raymond Purves Bone and Joint Research Laboratory, Kolling Institute, Northern Sydney Local Health District, St. Leonards, NSW, Australia
- Graduate School of Biomedical Engineering, University of New South Wales, Sydney, NSW, Australia
- Sydney Medical School, Northern, The University of Sydney, Sydney, NSW, Australia
- Faculty of Medicine and Health, The University of Sydney, Royal North Shore Hospital, St. Leonards, NSW, Australia
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Gjerde PB, Tollånes MC, Tropé A, Eide ML, Natvik M, Puntervoll HE. Livmorhalsprøvetaking i primærhelsetjenesten. Tidsskr Nor Laegeforen 2023; 143:23-0066. [PMID: 37589352 DOI: 10.4045/tidsskr.23.0066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/19/2023] Open
Abstract
BACKGROUND In Norway, approximately 360 000 cervical screening samples were taken in 2020, of which 11 000 were registered as inadequate. We therefore wished to investigate doctors' knowledge of cervical sample-taking in the primary health service. MATERIAL AND METHOD An anonymous survey on cervical sample-taking was sent by email to around 4 700 members of the Norwegian College of General Practice in September 2021. RESULTS Of the 1 039 doctors who responded to the survey, 820 (79 %) reported that they always indicate the reason for taking the sample in the requisition form, and 898 (86 %) reported that they avoid taking a sample during menstruation. Only one in three doctors (343) correctly indicated the location of the squamocolumnar junction in postmenopausal women. In response to a question aimed at users of the ThinPrep method, which is particularly sensitive to sampling errors, 426 out of 697 (61 %) answered that they either avoid using a lubricant or use a water-based lubricant, while only 35 % of the doctors responded that they stop taking the sample if bleeding occurs. INTERPRETATION The results show that although many doctors have satisfactory knowledge, a continuous focus on cervical sample-taking is essential. Correct sampling and knowledge of anatomical factors in postmenopausal women may be significant for reducing the number of inadequate samples.
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Affiliation(s)
- Priyanthi Borgen Gjerde
- Norsk kvalitetsforbedring av laboratorieundersøkelser (Noklus), og, Allmennmedisinsk forskningsenhet, Norce
| | - Mette Christophersen Tollånes
- Norsk kvalitetsforbedring av laboratorieundersøkelser (Noklus), og, Institutt for global helse og samfunnsmedisin, Universitetet i Bergen, og, Bergen kommune
| | | | - Maj Liv Eide
- Avdeling for patologi, St. Olavs hospital, og, Institutt for bioingeniørfag, NTNU
| | - Marianne Natvik
- Avdeling for allmennmedisin, Institutt for helse og samfunn, Universitetet i Oslo
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22
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Li W, Liang F, Dong S, Lü W, Liu Y, Wang X, Ma J. [Antifriction and anti-wear performances of bionic lubricating fluid containing gelatin nanoparticles for artificial joint materials]. Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi 2023; 37:196-201. [PMID: 36796816 DOI: 10.7507/1002-1892.202209035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
Objective The antifriction and antiwear effects of gelatin nanoparticles (GLN-NP) on artificial joint materials in bionic joint lubricant were investigated to provide a theoretical basis for the development of new bionic joint lubricant. Methods GLN-NP was prepared by cross-linking collagen acid (type A) gelatin with glutaraldehyde by acetone method, and the particle size and stability of GLN-NP were characterized. The biomimetic joint lubricants with different concentrations were prepared by mixing 5, 15, and 30 mg/mL GLN-NP with 15 and 30 mg/mL hyaluronic acid (HA), respectively. The friction reduction and antiwear effects of the biomimetic joint lubricants on zirconia ceramics were investigated on a tribometer. The cytotoxicity of each component of bionic joint lubricant on RAW264.7 mouse macrophages was evaluated by MTT assay. Results The particle size of GLN-NP was about 139 nm, and the particle size distribution index was 0.17, showing a single peak, indicating that the particle size of GLN-NP was uniform. In complete culture medium, pH7.4 PBS, and deionized water at simulated body temperature, the particle size of GLN-NP did not change more than 10 nm with time, indicating that GLN-NP had good dispersion stability and did not aggregate. Compared with 15 mg/mL HA, 30 mg/mL HA, and normal saline, the friction coefficient, wear scar depth, width, and wear volume were significantly reduced by adding different concentrations of GLN-NP ( P<0.05); there was no significant difference between different concentrations of GLN-NP ( P>0.05). Biocompatibility test showed that the cell survival rate of GLN-NP, HA, and HA+GLN-NP solution decreased slightly with the increase of concentration, but the cell survival rate was more than 90%, and there was no significant difference between groups ( P>0.05). Conclusion The bionic joint fluid containing GLN-NP has good antifriction and antiwear effect. Among them, GLN-NP saline solution without HA has the best antifriction and antiwear effect.
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Affiliation(s)
- Weihua Li
- Department of Orthopaedics, Huaihe Hospital, Henan University, Kaifeng Henan, 475000, P. R. China
| | - Fengguang Liang
- Department of Orthopaedics, Huaihe Hospital, Henan University, Kaifeng Henan, 475000, P. R. China
| | - Shiyu Dong
- Henan University of Science and Technology, Luoyang Henan, 471000, P. R. China
| | - Weizhen Lü
- Department of Orthopaedics, Huaihe Hospital, Henan University, Kaifeng Henan, 475000, P. R. China
| | - Yantao Liu
- Department of Orthopaedics, Huaihe Hospital, Henan University, Kaifeng Henan, 475000, P. R. China
| | - Xiao Wang
- Department of Orthopaedics, Huaihe Hospital, Henan University, Kaifeng Henan, 475000, P. R. China
| | - Jingyi Ma
- Nanoengineering Technology Center of Henan University, Kaifeng Henan, 475004, P. R. China
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23
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Nakamura S, Ito N, Sakurada A, Sakamoto T. Effects of Granulated Lactose Characteristics and Lubricant Blending Conditions on Tablet Physical Properties in Direct Powder Compression. Chem Pharm Bull (Tokyo) 2023; 71:687-694. [PMID: 37661374 DOI: 10.1248/cpb.c23-00262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/05/2023]
Abstract
Lactose is an excipient used extensively for bulking, diluting, and molding active pharmaceutical ingredients in tablet manufacturing. Particularly, granulated lactose (GL) intended for direct powder compression has distinct properties due to differences in manufacturing methods. It contributes to handling blended powders for tableting and tablet quality. In this study, we aimed to compare the functions of different forms of GL added as excipients during direct powder compression on the tablet properties and the effect of magnesium stearate (Mg-S) used as a lubricant on each type of GL. Different GL types obtained using different manufacturing methods (agitated granulation, GL-AG; spray-dried granulation, GL-SD; fluidized bed granulation, GL-FB) were blended with maize starch, low-substituted hydroxypropyl cellulose, and paracetamol in a V-type blender for 10 min. Mg-S was added at varying amounts (0.1, 1.0, and 2.0%) and blending times (5, 10, and 30 min) for the nine types of blended powders for tableting formulation. The powders were tableted, and the tablets were evaluated for weight and drug loading variations, tensile strength, friability, and disintegration time. When tablets with the same blending conditions were compared, the tensile strength and disintegration time were in the order of GL-FB > GL-SD > GL-AG. For each GL, we analyzed the effects of changes in the added amount of Mg-S and blending time using contour plots, evaluated the effects of blending conditions on tablet properties, and determined the target tablet properties. We investigated the optimization of the lubricant blending conditions to obtain suitable tablets.
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Affiliation(s)
- Shohei Nakamura
- Department of Pharmaceutical Technology, School of Clinical Pharmacy, College of Pharmaceutical Sciences, Matsuyama University
| | - Nanami Ito
- Department of Pharmaceutical Technology, School of Clinical Pharmacy, College of Pharmaceutical Sciences, Matsuyama University
| | - Ayumi Sakurada
- Department of Pharmaceutical Technology, School of Clinical Pharmacy, College of Pharmaceutical Sciences, Matsuyama University
| | - Takatoshi Sakamoto
- Department of Pharmaceutical Technology, School of Clinical Pharmacy, College of Pharmaceutical Sciences, Matsuyama University
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Jomar DE, Al-Shahwan S, Al-Beishri AS, Freidi A, Malik R. Risk Factors for Glaucoma Drainage Device Exposure in Children: A Case-Control Study. Am J Ophthalmol 2023; 245:174-183. [PMID: 36002072 DOI: 10.1016/j.ajo.2022.08.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 08/06/2022] [Accepted: 08/12/2022] [Indexed: 11/18/2022]
Abstract
PURPOSE To identify the risk factors for glaucoma drainage device (GDD) exposure in children. DESIGN Retrospective case-control study. METHODS The study population comprised children (one eye each) who presented with a history of GDD exposure to a tertiary care eye hospital over the period January 2014 to January 2020. Consecutive children (age <18 years) were included. A control group from the same time period (children without GDD exposure) were included in the ratio of 5 controls to every 1 case of exposure. The main outcome measures included risk factors for exposure (univariate and multivariate analysis). RESULTS A total of 21 eyes (of 21 children with implant exposure) and 115 eyes (of 115 children without exposure) were included in this study. During the same study period, a total of 494 eyes had undergone GDD implantation, giving an estimated incidence of exposure of 4.25%). In the bivariate analysis, GDD exposure was associated with multiple previous ocular surgeries (P = .001), longer follow-up duration (P < .001), combined procedure at the time of primary implantation (P = .002), and a younger age at the time of primary implantation (P = .006). The former 3 risk factors continued to prove a statistically significant association on multivariable regression analysis. Postoperative use of eye lubricants was more common among children in the control group (P = .007). CONCLUSION In pediatric glaucoma patients, younger age and combined procedure at the time of primary GDD implantation, in addition to multiple previous ocular surgeries, were associated with greater risk of implant exposure. Postoperative use of eye lubricants may be protective.
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Affiliation(s)
- Deema E Jomar
- From the Glaucoma Division, King Khaled Eye Specialist Hospital (D.E.J., S.A.-S., A.S.A.-B., R.M.), Riyadh, Saudi Arabia
| | - Sami Al-Shahwan
- From the Glaucoma Division, King Khaled Eye Specialist Hospital (D.E.J., S.A.-S., A.S.A.-B., R.M.), Riyadh, Saudi Arabia
| | - Ali S Al-Beishri
- From the Glaucoma Division, King Khaled Eye Specialist Hospital (D.E.J., S.A.-S., A.S.A.-B., R.M.), Riyadh, Saudi Arabia
| | - Alia Freidi
- Faculty of Health Sciences, American University of Beirut (A.F.), Beirut, Lebanon
| | - Rizwan Malik
- From the Glaucoma Division, King Khaled Eye Specialist Hospital (D.E.J., S.A.-S., A.S.A.-B., R.M.), Riyadh, Saudi Arabia; Department of Ophthalmology and Visual Science, University of Alberta (R.M.), Edmonton, Alberta, Canada; Department of Ophthalmology, Sheikh Khalifa Medical City, Abu Dhabi, United Arab Emirates.
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25
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Yao X, Lin W, Wang M, Wang S. Nature-Inspired High Temperature Scale-Resistant Slippery Lubricant-Induced Porous Surfaces (HTS-SLIPS). Small 2022; 18:e2203615. [PMID: 36148852 DOI: 10.1002/smll.202203615] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 08/28/2022] [Indexed: 06/16/2023]
Abstract
Scale formation is a longstanding and unresolved problem in a number of fields, including power production, petroleum exploration, thermal desalination, and construction. Herein, a high-temperature scale-resistant slippery lubricant-induced surface (HTS-SLIPS) is developed by one-step electrodeposition and lubricant infusion. The fractal cauliflower-like morphology with lubricant oil is conducive to forming an ultralow contact angle hysteresis of ≈1°. The 10-d real-world boiling trial indicates that by replacing the uncoated surface with HTS-SLIPS, the reduction in scale mass is greater than 200% because of the low surface free energy (4.3 mJ m-2 ) and outstanding smoothness (Ra = 41 ± 8 nm) of HTS-SLIPS. Thanks to the scale retardation, the bubble departure frequency of HTS-SLIPS is eightfold higher than that of uncoated surfaces, signifying superior heat transfer efficiency. In these demonstrations, HTS-SLIPS coated spiral tube exhibits better flowability and lower pressure drop than the uncoated one. In addition, favorable compatibility between HTS-SLIPS and mechanical vibration is experimentally verified to strengthen the descaling of SLIPS synergistically. It is anticipated that the simple and scalable coating fabrication approach will be applicable in numerous industrial high-temperature processes where scale formation is encountered.
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Affiliation(s)
- Xiaoxue Yao
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, P. R. China
| | - Wenzhu Lin
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, P. R. China
| | - Mingmei Wang
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, P. R. China
| | - Steven Wang
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, P. R. China
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Iizuka M, Mizukami M, Kurihara K. Viscosity of Nanoconfined Branched-Chain Fatty Acids Studied by Resonance Shear Measurements. Langmuir 2022; 38:12944-12950. [PMID: 36240007 DOI: 10.1021/acs.langmuir.2c02090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Lubricant performance can be improved using additives such as organic friction modifiers (OFMs) and is influenced by their conformation and properties in the space confined between the substrate surfaces, rendering the detailed property analysis of confined OFMs and lubricants a matter of high practical significance. To date, studies on fatty acids as confined OFMs have mainly focused on linear- and unsaturated-chain molecules, leaving branched-chain structures underexplored. To bridge this gap, we used resonance shear measurements in this study to probe the viscosity of two branched-chain C18 fatty acids (isostearic acid T and isostearic acid) confined between mica surfaces at different applied normal loads (L) and surface separation distances (D). The viscosity parameter (bs) of both acids significantly increased at D < ∼4 nm because of structuring and was lower for isostearic acid than that for isostearic acid T at L > ∼0.6 mN. This reversal of bulk viscosity order under nanoconfinement was ascribed to the ability of the bulky methyl-substituted side chain of isostearic acid to prevent ordering in the nanospace between the mica surfaces and thus preserve fluidlike properties. The obtained results provide fundamental insights into the lubricity of branched-chain fatty acids and are expected to promote the development of novel high-performance OFMs.
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Affiliation(s)
- Masanori Iizuka
- Nissan Chemical Corporation, Tsuboi-Nishi, Funabashi274-8507, Japan
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Aoba-ku, Sendai980-8577, Japan
| | - Masashi Mizukami
- New Industry Creation Hatchery Center, Tohoku University, Aoba-ku, Sendai980-8577, Japan
| | - Kazue Kurihara
- New Industry Creation Hatchery Center, Tohoku University, Aoba-ku, Sendai980-8577, Japan
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27
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Stark JS. Effects of lubricant oil and diesel on macrofaunal communities in marine sediments: A five year field experiment in Antarctica. Environ Pollut 2022; 311:119885. [PMID: 35977637 DOI: 10.1016/j.envpol.2022.119885] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 07/24/2022] [Accepted: 07/31/2022] [Indexed: 06/15/2023]
Abstract
Hydrocarbons pose significant risks to marine ecosystems. A field experiment investigated the effects of four different hydrocarbon products (diesel fuel and three lubricating oils: Unused, Used and Biodegradable) on sediment macrofaunal communities over a five year period, in a shallow Antarctic marine embayment. Sediments were defaunated, treated with a hydrocarbon and deployed in trays (including a control) on the seabed. Diesel fuel had the biggest initial impact on communities, with strong effects at 5 weeks and 1 year, in particular on annelids, but also on amphipods, ostracods and cumaceans. By five years, however, the effect of diesel was less than that of lubrication oils and showed more recovery than oiled treatments and the biggest effect was from the Used oil. There was an effect of hydrocarbons on diversity, especially diesel, at 5 weeks and 1 year, but by 2 and 5 years diversity was not different or greater in hydrocarbon treatments than controls. Total abundance was always lower in hydrocarbon treatments than controls, especially for crustaceans, but annelids were more abundant in oil treatments than controls at 5 years. Oils, and in some cases diesel, enhanced the abundance of some taxa at 2-5 years, including molluscs, some polychaete families (capitellids, cirratulids, dorvilleids), oligochaetes, as well as ostracods, cumaceans and isopods. Amphipods and tanaids were most sensitive to hydrocarbons, and annelids were very sensitive to diesel. The Biodegradable oil had similar magnitude community effects to standard oil at 5 years, but annelids were more affected by Biodegradable oil, particularly at 1 and 2 years, and it did not enhance annelid or mollusc abundance at 5 years like the other oils, except for some polychaete families. Impacts of spilled hydrocarbons in Antarctica will persist well beyond 5 years, but diesel impacts will recover faster than oil.
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Affiliation(s)
- Jonathan S Stark
- East Antarctic Monitoring Program, Australian Antarctic Division, Department of Climate Change, Energy, the Environment and Water, 203 Channel Highway, Kingston, Tasmania, 7050, Australia.
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28
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Lin H, Habibova L, Rauf A, Cojal González JD, Severin N, Kirstein S, Sokolov IM, Rabe JP. At Least 10-fold Higher Lubricity of Molecularly Thin D 2O vs H 2O Films at Single-Layer Graphene-Mica Interfaces. Nano Lett 2022; 22:7761-7767. [PMID: 36170968 PMCID: PMC9562466 DOI: 10.1021/acs.nanolett.2c01425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 09/01/2022] [Indexed: 06/16/2023]
Abstract
Interfacial water is a widespread lubricant down to the nanometer scale. We investigate the lubricities of molecularly thin H2O and D2O films confined between mica and graphene, via the relaxation of initially applied strain in graphene employing Raman spectroscopy. Surprisingly, the D2O films are at least 1 order of magnitude more lubricant than H2O films, despite the similar bulk viscosities of the two liquids. We propose a mechanism based on the known selective permeation of protons vs deuterons through graphene. Permeated protons and left behind hydroxides may form ion pairs clamping across the graphene sheet and thereby hindering the graphene from sliding on the water layer. This explains the lower lubricity but also the hindering diffusivity of the water layer, which yields a high effective viscosity in accordance with findings in dewetting experiments. Our work elucidates an unexpected effect and provides clues to the behavior of graphene on hydrous surfaces.
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29
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Ben-Trad L, Matei CI, Sava MM, Filali S, Duclos ME, Berthier Y, Guichardant M, Bernoud-Hubac N, Maniti O, Landoulsi A, Blanchin MG, Miossec P, Granjon T, Trunfio-Sfarghiu AM. Synovial Extracellular Vesicles: Structure and Role in Synovial Fluid Tribological Performances. Int J Mol Sci 2022; 23:ijms231911998. [PMID: 36233300 PMCID: PMC9570016 DOI: 10.3390/ijms231911998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 09/30/2022] [Accepted: 10/04/2022] [Indexed: 11/06/2022] Open
Abstract
The quality of the lubricant between cartilaginous joint surfaces impacts the joint’s mechanistic properties. In this study, we define the biochemical, ultrastructural, and tribological signatures of synovial fluids (SF) from patients with degenerative (osteoarthritis-OA) or inflammatory (rheumatoid arthritis-RA) joint pathologies in comparison with SF from healthy subjects. Phospholipid (PL) concentration in SF increased in pathological contexts, but the proportion PL relative to the overall lipids decreased. Subtle changes in PL chain composition were attributed to the inflammatory state. Transmission electron microscopy showed the occurrence of large multilamellar synovial extracellular vesicles (EV) filled with glycoprotein gel in healthy subjects. Synovial extracellular vesicle structure was altered in SF from OA and RA patients. RA samples systematically showed lower viscosity than healthy samples under a hydrodynamic lubricating regimen whereas OA samples showed higher viscosity. In turn, under a boundary regimen, cartilage surfaces in both pathological situations showed high wear and friction coefficients. Thus, we found a difference in the biochemical, tribological, and ultrastructural properties of synovial fluid in healthy people and patients with osteoarthritis and arthritis of the joints, and that large, multilamellar vesicles are essential for good boundary lubrication by ensuring a ball-bearing effect and limiting the destruction of lipid layers at the cartilage surface.
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Affiliation(s)
- Layth Ben-Trad
- Laboratory of Contact and Structural Mechanics, University of Lyon, CNRS, INSA Lyon, UMR5259, Villeurbanne, 69100 Lyon, France
- Institute de Chimie et Biochimie Moléculaires et Supramoléculaires, ICBMS UMR 5246, University of Lyon, Université Lyon 1, CNRS, 69622 Lyon, France
- Faculty of Sciences of Bizerte, University of Carthage, Laboratory of Risques Liés aux Stress Environnementaux: Lutte et Prévention, Zarzouna 1054, Tunisia
- Institut Multidisciplinaire de Biochimie des Lipides, 69621 Villeurbanne, France
| | - Constantin Ionut Matei
- Laboratory of Contact and Structural Mechanics, University of Lyon, CNRS, INSA Lyon, UMR5259, Villeurbanne, 69100 Lyon, France
- Institut Multidisciplinaire de Biochimie des Lipides, 69621 Villeurbanne, France
- Institute Lumiere Mat, University of Lyon, CNRS, UCBL, ILM, UMR5506, 69622 Villeurbanne, France
| | - Mirela Maria Sava
- Laboratory of Contact and Structural Mechanics, University of Lyon, CNRS, INSA Lyon, UMR5259, Villeurbanne, 69100 Lyon, France
- Institut Multidisciplinaire de Biochimie des Lipides, 69621 Villeurbanne, France
| | - Samira Filali
- Unit of Immunogenetics & Inflammation EA-4130 & Department of Clinical Immunology and Rheumatology, University of Lyon, Hôpital Edouard Herriot, 69437 Lyon, France
| | - Marie-Eve Duclos
- Charles River Laboratories, 13, Allée de Nudlingen, 27950 Saint-Marcel, France
| | - Yves Berthier
- Laboratory of Contact and Structural Mechanics, University of Lyon, CNRS, INSA Lyon, UMR5259, Villeurbanne, 69100 Lyon, France
- Institut Multidisciplinaire de Biochimie des Lipides, 69621 Villeurbanne, France
| | - Michel Guichardant
- Laboratory of Contact and Structural Mechanics, University of Lyon, CNRS, INSA Lyon, UMR5259, Villeurbanne, 69100 Lyon, France
- Institut Multidisciplinaire de Biochimie des Lipides, 69621 Villeurbanne, France
| | - Nathalie Bernoud-Hubac
- Laboratory of Contact and Structural Mechanics, University of Lyon, CNRS, INSA Lyon, UMR5259, Villeurbanne, 69100 Lyon, France
- Institut Multidisciplinaire de Biochimie des Lipides, 69621 Villeurbanne, France
| | - Ofelia Maniti
- Institute de Chimie et Biochimie Moléculaires et Supramoléculaires, ICBMS UMR 5246, University of Lyon, Université Lyon 1, CNRS, 69622 Lyon, France
- Institut Multidisciplinaire de Biochimie des Lipides, 69621 Villeurbanne, France
| | - Ahmed Landoulsi
- Faculty of Sciences of Bizerte, University of Carthage, Laboratory of Risques Liés aux Stress Environnementaux: Lutte et Prévention, Zarzouna 1054, Tunisia
| | | | - Pierre Miossec
- Unit of Immunogenetics & Inflammation EA-4130 & Department of Clinical Immunology and Rheumatology, University of Lyon, Hôpital Edouard Herriot, 69437 Lyon, France
- Correspondence: (P.M.); (T.G.); Tel.: +33-472-431-503 (T.G.)
| | - Thierry Granjon
- Institute de Chimie et Biochimie Moléculaires et Supramoléculaires, ICBMS UMR 5246, University of Lyon, Université Lyon 1, CNRS, 69622 Lyon, France
- Institut Multidisciplinaire de Biochimie des Lipides, 69621 Villeurbanne, France
- Correspondence: (P.M.); (T.G.); Tel.: +33-472-431-503 (T.G.)
| | - Ana-Maria Trunfio-Sfarghiu
- Laboratory of Contact and Structural Mechanics, University of Lyon, CNRS, INSA Lyon, UMR5259, Villeurbanne, 69100 Lyon, France
- Institut Multidisciplinaire de Biochimie des Lipides, 69621 Villeurbanne, France
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Karkantonis T, Gaddam A, Sharma H, Cummins G, See TL, Dimov S. Laser-Enabled Surface Treatment of Disposable Endoscope Lens with Superior Antifouling and Optical Properties. Langmuir 2022; 38:11392-11405. [PMID: 36069741 PMCID: PMC9494739 DOI: 10.1021/acs.langmuir.2c01671] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/25/2022] [Revised: 08/20/2022] [Indexed: 06/15/2023]
Abstract
Endoscopes are ubiquitous in minimally invasive or keyhole surgeries globally. However, frequent removal of endoscopes from the patient's body due to the lens contaminations results in undesirable consequences. Therefore, a cost-effective process chain to fabricate thermoplastic-based endoscope lenses with superior antifouling and optical properties is proposed in this research. Such multifunctional surface response was achieved by lubricant impregnation of nanostructures. Two types of topographies were produced by femtosecond laser processing of metallic molds, especially to produce single-tier laser-induced periodic surface structures (LIPSS) and two-tier multiscale structures (MS). Then, these two LIPSS and MS masters were used to replicate them onto two thermoplastic substrates, namely polycarbonate and cyclic olefin copolymer, by using hot embossing. Finally, the LIPSS and MS surfaces of the replicas were infiltrated by silicone oils to prepare lubricant-impregnated surfaces (LIS). Droplet sliding tests revealed that the durability of the as-prepared LIS improved with the increase of the lubricant viscosity. Moreover, the single-tier LIPSS replicas exhibited longer-lasting lubricant conservation properties than the MS ones. Also, LIPSS-LIS replicas demonstrated an excellent optical transparency, better than the MS-LIS ones, and almost match the performance of the reference polished ones. Furthermore, the LIPSS-LIS treatment led to superior antifouling characteristics, i.e., regarding fogging, blood adhesion, protein adsorption, and microalgae attachment, and thus demonstrated its high suitability for treating endoscopic lenses. Finally, a proof-of-concept LIPSS-LIS treatment of endoscope lenses was conducted that confirmed their superior multifunctional response.
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Affiliation(s)
- Themistoklis Karkantonis
- Department
of Mechanical Engineering, School of Engineering, The University of Birmingham, Birmingham B15 2TT, U.K.
| | - Anvesh Gaddam
- Department
of Mechanical Engineering, School of Engineering, The University of Birmingham, Birmingham B15 2TT, U.K.
| | - Himani Sharma
- Department
of Chemical and Biomolecular Engineering, University of Notre Dame, Notre
Dame, Indiana 46556, United States
| | - Gerard Cummins
- Department
of Mechanical Engineering, School of Engineering, The University of Birmingham, Birmingham B15 2TT, U.K.
| | - Tian Long See
- The
Manufacturing Technology Centre Ltd., Coventry CV7 9JU, U.K.
| | - Stefan Dimov
- Department
of Mechanical Engineering, School of Engineering, The University of Birmingham, Birmingham B15 2TT, U.K.
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Li Y, Jia Y, Cai X, Xie M, Zhang Z. Oil pollutant identification based on excitation-emission matrix of UV-induced fluorescence and deep convolutional neural network. Environ Sci Pollut Res Int 2022; 29:68152-68160. [PMID: 35534705 DOI: 10.1007/s11356-022-20392-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 04/18/2022] [Indexed: 06/14/2023]
Abstract
Identifying the types of oil pollutants in a spill event can help determine the source of spill and formulate the plan of emergency responses. Excitation-emission matrix (EEM), which is also called three-dimensional fluorometric spectra, includes abundant spectral information in the domain of excitation wavelength and can be potentially applied to identify oil types. UV-induced fluorometric experiments were conducted in this study to collect EEMs for five types of oil that are commonly used in maritime transportation. A deep convolutional neural network (CNN) model for oil types identification was built based on the classic VGG-16 model. According to the identification results, the model was able to provide a reasonable classification on the five types of oil used in the experiments. Additionally, a biased classification result was observed in the experiment: the model was able to provide the most accurate classification on 0W40 lubricant but encounters difficulty distinguishing between - 10# diesel and 92# gasoline. The potential reasons for this result and the approaches to improve the model were also discussed.
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Affiliation(s)
- Ying Li
- Navigation College, Dalian Maritime University, Dalian, China
| | - Yunpeng Jia
- Navigation College, Dalian Maritime University, Dalian, China
| | - Xiaohua Cai
- Navigation College, Dalian Maritime University, Dalian, China
| | - Ming Xie
- Navigation College, Dalian Maritime University, Dalian, China.
| | - Zhenduo Zhang
- Navigation College, Dalian Maritime University, Dalian, China
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Lee D, Seo JM, Kooistra K, Lee H. Identification of bilge oil with lubricant: Recent oil spill case studies. Environ Res 2022; 212:113325. [PMID: 35439455 DOI: 10.1016/j.envres.2022.113325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 04/10/2022] [Accepted: 04/13/2022] [Indexed: 06/14/2023]
Abstract
Oil spills have many adverse effects on the marine environment. Bilge oil spills occur frequently in the sea as a result of maritime accidents or illegal discharge. It is difficult to unambiguously identify the specific sources of such spills because bilge oil contains a mixture of fuel oil and lubricant. In this study, bilge oils with different fuel oil/lubricant ratios were prepared and analyzed using a modified version of the CEN/TR methodology (European Committee for Standardization, 2012). As the lubricant content of bilge oil increased, the intensity of the C20-C24 group, which is the commonly-used normalization compound group for fuel oil in the percentage weathering (PW) plot, also changed. Therefore, the mean area of the C15-C18 group, which was affected by the lubricant content, was used instead. Although heavy fuel oil is usually normalized to a hopane, bilge oil with a high lubricant content cannot be analyzed based on a mass spectrometry (MS)-PW plot; thus, heavy fuel oil-based bilge oil was normalized to a phytane in this study. Although hopanes and styrenes are unsuitable comparison compounds for heavy fuel oil-based bilge oil analysis, for light fuel oil-based bilge oil, hopanes and steranes could be applied as diagnostic ratio comparisons when the lubricant peak was clearly detected in the chromatograms of the spilled and suspected oil samples. By applying the CEN/TR methodology according to this approach, the similarities between spilled and suspected oil samples were more easily revealed. In addition, the field applicability of the proposed method was tested for four actual oil spills.
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Affiliation(s)
- Duwon Lee
- Korea Coast Guard Research Center, Korea Coast Guard Academy, Korea Coast Guard, Cheonan, 31254, South Korea
| | - Jeong Mog Seo
- Korea Coast Guard Research Center, Korea Coast Guard Academy, Korea Coast Guard, Cheonan, 31254, South Korea
| | - Kees Kooistra
- Rijkswaterstaat Laboratory, Ministry of Infrastructure and Water Management, Lelystad, 8224, the Netherlands
| | - Heejin Lee
- Korea Coast Guard Research Center, Korea Coast Guard Academy, Korea Coast Guard, Cheonan, 31254, South Korea.
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Nitzan DW, Naaman HL. Athrocentesis: What, When, and Why? Atlas Oral Maxillofac Surg Clin North Am 2022; 30:137-145. [PMID: 36116872 DOI: 10.1016/j.cxom.2022.06.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The introduction of temporomandibular joint (TMJ) arthroscopy by Onishi in 1970 (results published in 1975 and 1980) opened a new modality for TMJ treatment. The efficiency of arthroscopic lavage and lysis led in the 1990s to its simplification: TMJ arthrocentesis. Always associated with load control, physiotherapy, and elimination of any occlusal hazards, arthrocentesis, a simple procedure, entails less expensive and more available tools and is performed under local anesthesia. Although lacking direct visual inspection of the joint structures, it has become quite popular. Arthrocentesis is most efficient in localized joint pain and limited joint movements such as closed lock, anchored disc phenomenon, osteoarthritis, and various inflammatory diseases. In clicking joint, the results are somewhat controversial. The efficiency of arthrocentesis elicited many enquiries that led to the study and a better understanding of joint function and dysfunction and the actual role of disc location. The release of closed lock without disc repositioning was quite surprising; it improved our understanding of the pathogenesis of closed lock and led to the discovery of the anchored disc phenomenon. This was followed by the awareness of the joint-lubrication system and, in turn, alternative suggestions for the pathogenesis of TMJ disc displacement with and without reduction, open lock, and osteoarthritis, and ultimately by the development of an effective bio-lubricant. Awareness of the role of joint overloading led to the development of an interocclusal appliance that reduces intraarticular pressure; it has become a "must" support for arthrocentesis and any surgical intervention. In our view, arthrocentesis is the definitive indication of the need for surgical intervention and, therefore, should be the first in the cascade of interventions in TMJ disorders.
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Affiliation(s)
- Dorrit W Nitzan
- Department of Oral and Maxillofacial Surgery, Hadassah School of Dental Medicine, The Hebrew University, Jerusalem, Israel.
| | - Hadas Lehman Naaman
- Oral and Maxillofacial Surgery, Shaare Zedek Medical Center, Jerusalem, Israel
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Cavazzoli S, Selonen V, Rantalainen AL, Sinkkonen A, Romantschuk M, Squartini A. Natural additives contribute to hydrocarbon and heavy metal co-contaminated soil remediation. Environ Pollut 2022; 307:119569. [PMID: 35680061 DOI: 10.1016/j.envpol.2022.119569] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2022] [Revised: 05/23/2022] [Accepted: 05/31/2022] [Indexed: 06/15/2023]
Abstract
A biological treatment method was tested in laboratory conditions for the removal of hydrocarbons contained in a waste disposal soil sample consisting of excavated sandy soil from a former fueling station. Two fractions of hydrocarbons were quantified by GC-FID: diesel (C10-C21) and lubricant oil (C22-C40). Meat and bone meal (MBM, 1% w/w) was used as a bio-stimulant agent for soil organisms. Cyclodextrin, an oligosaccharide produced from starch by enzymatic conversion, was also used to assess its ability to improve the bioavailability/biodegradability of hydrocarbons in the soil. Parameters such as temperature, pH, water content and aeration (O2 availability) were monitored and optimized to favor degradation processes. Two different experimental tests were prepared: one to measure the degradation of hydrocarbons; the other to monitor the mobility of some elements in the soil and in the leachate produced by watering with tap water. Soil samples treated with MBM and cyclodextrin showed, over time, a greater removal of the more persistent hydrocarbon fraction (lubricant oil). MBM-treated soils underwent a faster hydrocarbon removal kinetic, especially in the first treatment period. However, the final hydrocarbon concentrations are comparable in all treatments, including control. Over time, the effect of cyclodextrin on hydrocarbon degradation seemed to be relevant. MBM-treated soils sequestered lead in the very first weeks. These results highlight the intrinsic capacity of soil, and its indigenous microbial communities, to degrade petroleum hydrocarbons and suggest that MBM-induced bioremediation is a promising, environmentally friendly technology which should be considered when dealing with hydrocarbon/heavy metal co-contaminated soils.
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Affiliation(s)
- Simone Cavazzoli
- Department of Civil, Environmental and Mechanical Engineering, University of Trento, Via Mesiano 77, 38123, Trento, Italy; Faculty of Biological and Environmental Sciences, Ecosystems and Environment Research Programme, University of Helsinki, Niemenkatu 73, FI-15140, Lahti, Finland.
| | - Ville Selonen
- Faculty of Biological and Environmental Sciences, Ecosystems and Environment Research Programme, University of Helsinki, Niemenkatu 73, FI-15140, Lahti, Finland
| | - Anna-Lea Rantalainen
- Faculty of Biological and Environmental Sciences, Ecosystems and Environment Research Programme, University of Helsinki, Niemenkatu 73, FI-15140, Lahti, Finland
| | - Aki Sinkkonen
- Faculty of Biological and Environmental Sciences, Ecosystems and Environment Research Programme, University of Helsinki, Niemenkatu 73, FI-15140, Lahti, Finland; Natural Resources Institute Finland Luke, Itäinen Pitkäkatu 4 A, 20520, Turku, Finland
| | - Martin Romantschuk
- Faculty of Biological and Environmental Sciences, Ecosystems and Environment Research Programme, University of Helsinki, Niemenkatu 73, FI-15140, Lahti, Finland
| | - Andrea Squartini
- Department of Agronomy, Food, Natural Resources, Animals and Environment, University of Padova, Via Dell'Università 16, 35020, Legnaro, Italy
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Bresme F, Kornyshev AA, Perkin S, Urbakh M. Electrotunable friction with ionic liquid lubricants. Nat Mater 2022; 21:848-858. [PMID: 35761059 DOI: 10.1038/s41563-022-01273-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 05/02/2022] [Indexed: 06/15/2023]
Abstract
Room-temperature ionic liquids and their mixtures with organic solvents as lubricants open a route to control lubricity at the nanoscale via electrical polarization of the sliding surfaces. Electronanotribology is an emerging field that has a potential to realize in situ control of friction-that is, turning the friction on and off on demand. However, fulfilling its promise needs more research. Here we provide an overview of this emerging research area, from its birth to the current state, reviewing the main achievements in non-equilibrium molecular dynamics simulations and experiments using atomic force microscopes and surface force apparatus. We also present a discussion of the challenges that need to be solved for future applications of electrotunable friction.
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Affiliation(s)
- Fernando Bresme
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London, UK.
| | - Alexei A Kornyshev
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London, UK.
| | - Susan Perkin
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, UK.
| | - Michael Urbakh
- Department of Physical Chemistry, School of Chemistry, The Raymond and Beverly Sackler Faculty of Exact Sciences, and The Sackler Center for Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv, Israel.
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Gottlieb M, Casteel C, Ramsay N. Ring Removal: A Comprehensive Review of Techniques. J Emerg Med 2022; 63:272-282. [PMID: 36045023 DOI: 10.1016/j.jemermed.2022.04.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 02/19/2022] [Accepted: 04/23/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND Entrapped rings can be dangerous, leading to increased pressure and damage to soft tissue, nerves, and vasculature. In order to properly care for these injuries, it is important for emergency medicine clinicians to be aware of the different approaches to remove entrapped rings. METHODS We searched PubMed to determine the different techniques and supporting literature for ring removal. DISCUSSION There are a number of approaches that can be used to remove an entrapped ring. Clinicians should first consider the role of lubricants to reduce surface tension. Specific removal techniques include compression-based methods, traction-based techniques, rotation-based approaches, and the use of ring-cutting devices. There are unique advantages and limitations of each technique that are important to consider. CONCLUSIONS Emergency medicine clinicians need to be familiar with several different approaches to ring removal. This article summarizes the key techniques, variations on these techniques, advantages, and disadvantages for each approach.
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Affiliation(s)
- Michael Gottlieb
- Department of Emergency Medicine, Rush University Medical Center, Chicago, Illinois
| | - Christian Casteel
- Department of Emergency Medicine, Rush University Medical Center, Chicago, Illinois
| | - Nicolas Ramsay
- Department of Emergency Medicine, Rush University Medical Center, Chicago, Illinois
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Safir M, Hecht I, Ahimor A, Zmujack-Yehiam S, Stein R, Bakshi E, Einan-Lifshitz A, Hartstein ME. The effect of thermo-mechanical device (Tixel) treatment on evaporative dry eye disease - A pilot prospective clinical trial. Cont Lens Anterior Eye 2022; 45:101741. [PMID: 35864019 DOI: 10.1016/j.clae.2022.101741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Revised: 07/08/2022] [Accepted: 07/13/2022] [Indexed: 11/18/2022]
Abstract
PURPOSE To examine the effects of treatment with a thermomechanical skin device to the eyelid area on the clinical signs and symptoms of patients who suffer from dry eye disease (DED) secondary to meibomian gland dysfunction (MGD). METHODS Forty patients aged 45 years or older with DED due to MGD were recruited. Both eyes (n = 80) of each patient received three treatments with the Tixel device (Novoxel®, Israel), with each treatment separated by a 2-week period. Treatment was applied across the upper and lower eyelids, with the same intensity, tip protrusion distance, and contact duration. Two additional follow-up visits were performed at 2-week intervals after treatment cessation. DED status was evaluated during each visit via SPEED II questionnaire, tear break-up time (TBUT), corneal staining score (CSS), MGD score, and frequency of lubricant use. Visual acuity (VA) was recorded during first and last visits. RESULTS Mean age was 64.3 ± 12.4 years and 72.5 % (n = 29) were female. 45 % (n = 18) had a history of blepharitis, 12.5 % (n = 5) had chalazia, and 17.5 % (n = 7) suffered from allergic conjunctivitis. Mean follow-up time was 2.1 ± 0.6 months. Comparing the first and last visits, all parameters showed significant improvement after Tixel treatment: mean SPEED II scores (16.5 ± 5.9 to 11.8 ± 6.7, p < 0.001), CSS (2.0 ± 1.3 to 0.5 ± 0.9, p < 0.001), TBUT (2.7 ± 0.8 s to 6.5 ± 2.2 s, p < 0.001), MGD score (2.7 ± 0.5 to 1.2 ± 0.4, p < 0.001), and rate of lubricant use (3.4 ± 2.4 per day to 1.9 ± 2.0, p < 0.001). VA also improved (0.10 ± 0.11 logMAR to 0.08 ± 0.10 logMAR, p < 0.05). No major side effects were observed. CONCLUSIONS In this pilot study Tixel treatment induced significant improvement of signs and symptoms among patients with DED due to MGD. Benefits persisted for at least one month. Further randomized controlled double-blinded studies are needed.
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Affiliation(s)
- Margarita Safir
- Ophthalmology Department, Shamir Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
| | - Idan Hecht
- Ophthalmology Department, Shamir Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Alon Ahimor
- Ophthalmology Department, Shamir Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Sigal Zmujack-Yehiam
- Ophthalmology Department, Shamir Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Ran Stein
- Ophthalmology Department, Shamir Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Erez Bakshi
- Ophthalmology Department, Shamir Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Adi Einan-Lifshitz
- Ophthalmology Department, Shamir Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Morris E Hartstein
- Ophthalmology Department, Shamir Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
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Lacroix-Andrivet O, Moualdi S, Hubert-Roux M, Loutelier Bourhis C, Mendes Siqueira AL, Afonso C. Molecular Characterization of Formulated Lubricants and Additive Packages Using Kendrick Mass Defect Determined by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry. J Am Soc Mass Spectrom 2022; 33:1194-1203. [PMID: 35709480 DOI: 10.1021/jasms.2c00050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Formulated lubricants correspond to high value products used for several applications in automotive, industrial, medicinal, and agro-food sectors. They correspond to complex matrices composed of approximately 80% of base oils (mineral or synthetic) and of about 20% of additives. Additives are generally low molecular weight polymeric molecules with a great diversity of elements. To characterize such complex compositions at the molecular level, ultrahigh resolution mass spectrometers are required. Two formulated lubricants and two additive packages were analyzed by Fourier transform ion cyclotron resonance mass spectrometry in direct infusion. Atmospheric pressure chemical ionization (APCI) and electrospray ionization (ESI) sources were used to have an exhaustive characterization of the samples. The Kendrick mass defects (KMD) plot is a widespread representation to characterize polymeric molecules. Here, the terms apparent mass defect and apparent Kendrick mass defects (aKMD) values were introduced to consider the uncertainty on nominal mass determination. Several additive families including alkyldiphenylamines, trisalkylphenylthiophosphoric acid, zinc dithiophosphates, bisuccinimide dispersants, and their derivatives were observed by APCI(+). ESI(-) also presented a use for the selective ionization of acidic compounds including sulfonates, phenates, and sulfur phenate molecules. The specific aKMD values and polydispersity of many additive families have been reported to create a database of additives. Overall, this study demonstrated the great utility of the aKMD approach and the use of the ESI/APCI combination for a simple and fast characterization of formulated lubricant and additive package samples.
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Affiliation(s)
- Oscar Lacroix-Andrivet
- TotalEnergies Marketing Services, Research Center, 69360 Solaize, France
- Normandie Univ, COBRA, UMR6014 and FR3038, Université de Rouen, INSA de Rouen, CNRS, IRCOF, 1 rue Tesnière, 76821 Mont-Saint-Aignan Cedex, France
- International Joint Laboratory - iC2MC: Complex Matrices Molecular Characterization, TRTG, BP 27, 76700 Harfleur, France
| | - Samira Moualdi
- TotalEnergies Marketing Services, Research Center, 69360 Solaize, France
| | - Marie Hubert-Roux
- Normandie Univ, COBRA, UMR6014 and FR3038, Université de Rouen, INSA de Rouen, CNRS, IRCOF, 1 rue Tesnière, 76821 Mont-Saint-Aignan Cedex, France
- International Joint Laboratory - iC2MC: Complex Matrices Molecular Characterization, TRTG, BP 27, 76700 Harfleur, France
| | - Corinne Loutelier Bourhis
- Normandie Univ, COBRA, UMR6014 and FR3038, Université de Rouen, INSA de Rouen, CNRS, IRCOF, 1 rue Tesnière, 76821 Mont-Saint-Aignan Cedex, France
| | - Anna Luiza Mendes Siqueira
- TotalEnergies Marketing Services, Research Center, 69360 Solaize, France
- Normandie Univ, COBRA, UMR6014 and FR3038, Université de Rouen, INSA de Rouen, CNRS, IRCOF, 1 rue Tesnière, 76821 Mont-Saint-Aignan Cedex, France
| | - Carlos Afonso
- Normandie Univ, COBRA, UMR6014 and FR3038, Université de Rouen, INSA de Rouen, CNRS, IRCOF, 1 rue Tesnière, 76821 Mont-Saint-Aignan Cedex, France
- International Joint Laboratory - iC2MC: Complex Matrices Molecular Characterization, TRTG, BP 27, 76700 Harfleur, France
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Abstract
A man in his 30s, with a history of two operated penetrating keratoplasty (PK), primarily for viral keratitis, presented with pain, redness and diminution of vision in his left eye of 4 days duration. Postoperatively, he was prescribed oral antivirals, topical steroid eyedrops, lubricants and antiglaucoma medications. Eight months after transplantation, an epithelial defect with heaped up margins was noted on anterior segment evaluation on a routine follow-up visit. On checking his medications, it was found that the patient was unknowingly using bromfenac drops in place of brimonidine tartrate for the past month. A diagnosis of neurotrophic keratitis was made in the setting of PK performed for viral keratitis, incited by use of topical bromfenac. The patient was prescribed preservative-free lubricants with immediate discontinuation of bromfenac drops. Topical steroid drops were withheld till the epithelial defect healed. Complete healing of the defect was noted after 4 weeks of therapy.
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Affiliation(s)
- Nimmy Raj
- Cornea, Cataract and Refractive Surgery Services, Dr Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, Delhi, India
| | - Arnav Panigrahi
- Cornea, Cataract and Refractive Surgery Services, Dr Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, Delhi, India
| | - Mahboob Alam
- Cornea, Cataract and Refractive Surgery Services, Dr Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, Delhi, India
| | - Noopur Gupta
- Cornea, Cataract and Refractive Surgery Services, Dr Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, Delhi, India
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Sun X, Kong D, Liang C, Hu Y, Duan JA. Flexible and Precise Droplet Manipulation by a Laser-Induced Shape Temperature Field on a Lubricant-Infused Surface. Langmuir 2022; 38:6731-6740. [PMID: 35587878 DOI: 10.1021/acs.langmuir.2c00680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Light actuation on a lubricant-infused surface (LIS) has attracted great attention because of its flexibility and remote control of droplet motion. However, to actuate a droplet on a LIS flexibly and precisely by light, the key issue is to control two degrees of freedom of the droplet motion in real time. In this paper, we propose a C-shape temperature field (CSTF) induced by rapid and selective laser irradiation on a LIS. The CSTF could not only manipulate a single droplet precisely and flexibly but also process multiple droplets automatically and orderly in real time. The mechanism showed that the droplet was confined by the Marangoni force in two orthogonal directions. For single droplet manipulation, the CSTF had the capability of correcting the off-track droplet motion. Moreover, the droplet motion, including rectilinear motion and curvilinear motion, could be precisely and flexibly controlled by the motion of the CSTF. For manipulation of multiple droplets, coalescence of multiple droplets was successfully achieved by triple rotating CSTFs. Such a method was applied in the detection of 5 μL of bovine serum albumin (BSA) by triggering chromogenic reactions automatically and orderly, which improved the efficiency of the whole process. We believe that this method is a significant candidate for intelligent droplet manipulation.
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Affiliation(s)
- Xiaoyan Sun
- State Key Laboratory of High Performance and Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan, China
| | - Dejian Kong
- State Key Laboratory of High Performance and Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan, China
| | - Chang Liang
- State Key Laboratory of High Performance and Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan, China
| | - Youwang Hu
- State Key Laboratory of High Performance and Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan, China
- Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory, Guangzhou 510610, China
| | - Ji-An Duan
- State Key Laboratory of High Performance and Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan, China
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Russo MJ, Han M, Menon NG, Quigley AF, Kapsa RMI, Moulton SE, Guijt RM, M Silva S, Schmidt TA, Greene GW. Novel Boundary Lubrication Mechanisms from Molecular Pillows of Lubricin Brush-Coated Graphene Oxide Nanosheets. Langmuir 2022; 38:5351-5360. [PMID: 35465662 DOI: 10.1021/acs.langmuir.1c02970] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
There are numerous biomedical applications where the interfacial shearing of surfaces can cause wear and friction, which can lead to a variety of medical complications such as inflammation, irritation, and even bacterial infection. We introduce a novel nanomaterial additive comprised of two-dimensional graphene oxide nanosheets (2D-NSCs) coated with lubricin (LUB) to reduce the amount of tribological stress in biomedical settings, particularly at low shear rates where boundary lubrication dominates. LUB is a glycoprotein found in the articular joints of mammals and has recently been discovered as an ocular surface boundary lubricant. The ability of LUB to self-assemble into a "telechelic" brush layer on a variety of surfaces was exploited here to coat the top and bottom surfaces of the ultrathin 2D-NSCs in solution, effectively creating a biopolymer-coated nanosheet. A reduction in friction of almost an order of magnitude was measured at a bioinspired interface. This reduction was maintained after repeated washing (5×), suggesting that the large aspect ratio of the 2D-NSCs facilitates effective lubrication even at diluted concentrations. Importantly, and unlike LUB-only treatment, the lubrication effect can be eliminated over 15 rinsing cycles, suggesting that the LUB-coated 2D-NSCs do not exhibit any binding interactions with the shearing surfaces. The effective lubricating properties of the 2D-NSCs combined with full reversibility through rinsing make the LUB-coated 2D-NSCs an intriguing candidate as a lubricant for biomedical applications.
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Affiliation(s)
- Matthew J Russo
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Melbourne, Victoria 3216, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Mingyu Han
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Melbourne, Victoria 3216, Australia
| | - Nikhil G Menon
- Biomedical Engineering Department, School of Dental Medicine, UConn Health, Farmington, Connecticut 06030 United States
| | - Anita F Quigley
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3000, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Robert M I Kapsa
- ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Wollongong, New South Wales 2522, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Simon E Moulton
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- Iverson Health Innovation Research Institute, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Rosanne M Guijt
- Centre for Regional and Rural Futures, Deakin University, Geelong, Victoria 3220, Australia
| | - Saimon M Silva
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- Iverson Health Innovation Research Institute, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Tannin A Schmidt
- Biomedical Engineering Department, School of Dental Medicine, UConn Health, Farmington, Connecticut 06030 United States
| | - George W Greene
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Melbourne, Victoria 3216, Australia
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Bizrah M, Yuan PH, Ching G, Holland SP. P-13 Trans-epithelial phototherapeutic keratectomy (PTK) for recurrent corneal erosion syndrome (RCES). BMJ Open Ophthalmol 2022; 7:A4. [PMID: 36161817 DOI: 10.1136/bmjophth-2022-bcm.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023] Open
Abstract
UNLABELLED *Correspondence - Mukhtar Bizrah: m.bizrah@nhs.net OBJECTIVE: To evaluate the efficacy and safety of trans-epithelial phototherapeutic keratectomy (PTK) as a treatment for recurrent cornea erosion syndrome (RCES) in patients with symptoms refractory to conventional treatments. METHODS AND ANALYSIS All patients who received PTK treatment for RCES had failed more than one conventional treatment, and were first vetted and approved by the British Columbia public health authority. A retrospective chart review and telephone survey were conducted at the Pacific Laser Eye Centre. Exclusion criteria were ocular co-morbidities potentially affecting treatment efficacy. RESULTS This study included 593 eyes of 555 patients (46.2% male; 50.9±14.2 years old) who underwent PTK. The leading identified causes of RCES were trauma (45.7%) and anterior basement membrane dystrophy (44.2%). The most common pre-PTK interventions were ocular lubricants (90.9%), hypertonic solutions (77.9%), and bandage contact lenses (50.9%). 36 eyes had undergone surgical interventions such as stromal puncture, epithelial debridement, or diamond burr polishing. Post-PTK, 78% of patients did not require any subsequent therapies, 20% required ongoing drops and 6 patients (1.1%) reported no symptom improvement. All 6 eyes were successfully retreated with PTK between 11.3±14.9 months from initial PTK. All study patients showed no significant differences in best corrected visual acuity pre vs. postoperatively. CONCLUSION When compared to other surgical options, PTK is potentially more costly but frequently more effective and has a high safety profile. The third-party public health vetted nature of this study, the high patient satisfaction, and the low recurrence rate of RCES suggest that PTK should be considered at an earlier stage in the management of RCES.
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Affiliation(s)
| | - Po Hsiang Yuan
- Department of Ophthalmology and Visual Sciences, The University of British Columbia Faculty of Medicine, Vancouver, British Columbia, Canada
| | - Geoffrey Ching
- Department of Ophthalmology and Visual Sciences, The University of British Columbia Faculty of Medicine, Vancouver, British Columbia, Canada
| | - Simon P Holland
- Department of Ophthalmology and Visual Sciences, The University of British Columbia Faculty of Medicine, Vancouver, British Columbia, Canada
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Lee YA, Cho S, Choi S, Kwon O, Yoon SM, Kim SJ, Park K, Chung S, Moon M. Slippery, Water-Infused Membrane with Grooved Nanotrichomes for Lubricating-Induced Oil Repellency. Adv Sci (Weinh) 2022; 9:e2103950. [PMID: 35138051 PMCID: PMC9069195 DOI: 10.1002/advs.202103950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 01/21/2022] [Indexed: 06/14/2023]
Abstract
Water, abundant and ubiquitous in nature, is an easy yet powerful resource for the creatures to survive by putting together with their topologies interfacing their living environment. Here, a slippery, water-infusing surface (SWIS) that retains a thick and stable water layer on the membrane is presented, robustly maintaining the oil repellency against the pressure and friction of immiscible liquids. Inspired by the plant trichome structures and their function, grooved nanotrichome, formed on the fibrous membrane by the oxygen plasma etching, induces robust water lubrication on the SWIS. SWIS membrane repels and separates highly viscous and adhesive oils in air and underwater by preventing oils from adhering to the lubricating surface. Repeated tests both in air and underwater confirm the antiadhesion and self-cleaning properties of the SWIS. The SWIS oil scooper, fixed on a frame with a handle, successfully collects spilled oil on a pilot-scale oil spill site and a real ocean oil spill site by simply scooping and recovering the oil. In addition, SWIS membrane is expected to help protect environments with further applications such as oil-wastewater treatment and oil separation in food.
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Affiliation(s)
- Young A Lee
- Extreme Materials Research CenterKorea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
- Department of Biomicrosystem TechnologyKorea UniversitySeoul02841Republic of Korea
| | - Seohyun Cho
- Extreme Materials Research CenterKorea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
- School of Mechanical EngineeringKorea UniversitySeoul02841Republic of Korea
| | - Seounkyun Choi
- School of Mechanical EngineeringKorea UniversitySeoul02841Republic of Korea
| | - O‐Chang Kwon
- Extreme Materials Research CenterKorea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
- School of Mechanical EngineeringKorea UniversitySeoul02841Republic of Korea
| | - Sun Mi Yoon
- Extreme Materials Research CenterKorea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
| | - Seong Jin Kim
- Extreme Materials Research CenterKorea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
| | - Kyoo‐Chul Park
- Department of Mechanical EngineeringNorthwestern UniversityEvanstonIL60208USA
| | - Seok Chung
- Department of Biomicrosystem TechnologyKorea UniversitySeoul02841Republic of Korea
- School of Mechanical EngineeringKorea UniversitySeoul02841Republic of Korea
- KU‐KIST Graduate School of Converging Science and TechnologyKorea UniversitySeoul02841Republic of Korea
| | - Myoung‐Woon Moon
- Extreme Materials Research CenterKorea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
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de Araujo-Silva R, Vieira AC, de Campos Giordano R, Fernandez-Lafuente R, Tardioli PW. Enzymatic Synthesis of Fatty Acid Isoamyl Monoesters from Soybean Oil Deodorizer Distillate: A Renewable and Ecofriendly Base Stock for Lubricant Industries. Molecules 2022; 27:molecules27092692. [PMID: 35566043 PMCID: PMC9104904 DOI: 10.3390/molecules27092692] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 04/18/2022] [Accepted: 04/20/2022] [Indexed: 11/16/2022]
Abstract
In this study, soybean oil deodorizer distillate (SODD), a mixture of free fatty acids and acylglycerides, and isoamyl alcohol were evaluated as substrates in the synthesis of fatty acid isoamyl monoesters catalyzed by Eversa (a liquid formulation of Thermomyces lanuginosus lipase). SODD and the products were characterized by the chemical and physical properties of lubricant base stocks. The optimal conditions to produce isoamyl fatty acid esters were determined by response surface methodology (RSM) using rotational central composite design (RCCD, 23 factorial + 6 axial points + 5 replications at the central point); they were 1 mol of fatty acids (based on the SODD saponifiable index) to 2.5 mol isoamyl alcohol, 45 °C, and 6 wt.% enzymes (enzyme mass/SODD mass). The effect of the water content of the reactional medium was also studied, with two conditions of molecular sieve ratio (molecular sieve mass/SODD mass) selected as 39 wt.% (almost anhydrous reaction medium) and 9 wt.%. Ester yields of around 50 wt.% and 70 wt.% were reached after 50 h reaction, respectively. The reaction products containing 43.7 wt.% and 55.2 wt.% FAIE exhibited viscosity indices of 175 and 163.8, pour points of -6 °C and -9 °C, flash points of 178 and 104 °C, and low oxidative stability, respectively. Their properties (mainly very high viscosity indices) make them suitable to be used as base stocks in lubricant formulation industries.
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Affiliation(s)
- Rafael de Araujo-Silva
- Graduate Program in Chemical Engineering (PPGEQ), Laboratory of Enzyme Technologies (LabEnz), Department of Chemical Engineering, Federal University of São Carlos (DEQ/UFSCar), Rod. Washington Luiz, km 235, São Carlos 13565-905, SP, Brazil; (R.d.A.-S.); (A.C.V.); (R.d.C.G.)
| | - Ana Carolina Vieira
- Graduate Program in Chemical Engineering (PPGEQ), Laboratory of Enzyme Technologies (LabEnz), Department of Chemical Engineering, Federal University of São Carlos (DEQ/UFSCar), Rod. Washington Luiz, km 235, São Carlos 13565-905, SP, Brazil; (R.d.A.-S.); (A.C.V.); (R.d.C.G.)
| | - Roberto de Campos Giordano
- Graduate Program in Chemical Engineering (PPGEQ), Laboratory of Enzyme Technologies (LabEnz), Department of Chemical Engineering, Federal University of São Carlos (DEQ/UFSCar), Rod. Washington Luiz, km 235, São Carlos 13565-905, SP, Brazil; (R.d.A.-S.); (A.C.V.); (R.d.C.G.)
| | - Roberto Fernandez-Lafuente
- Departamento de Biocatálisis, ICP-CSIC, Campus UAM-CSIC, 28049 Madrid, Spain
- Center of Excellence in Bionanoscience Research, External Scientific Advisory Board, King Abdulaziz University, Jeddah 21589, Saudi Arabia
- Correspondence: (R.F.-L.); (P.W.T.); Tel.: +34-91594804 (R.F.-L.); +55-16-3351-9362 (P.W.T.)
| | - Paulo Waldir Tardioli
- Graduate Program in Chemical Engineering (PPGEQ), Laboratory of Enzyme Technologies (LabEnz), Department of Chemical Engineering, Federal University of São Carlos (DEQ/UFSCar), Rod. Washington Luiz, km 235, São Carlos 13565-905, SP, Brazil; (R.d.A.-S.); (A.C.V.); (R.d.C.G.)
- Correspondence: (R.F.-L.); (P.W.T.); Tel.: +34-91594804 (R.F.-L.); +55-16-3351-9362 (P.W.T.)
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45
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Agarwal H, Quinn LJ, Walter SC, Polaske TJ, Chang DH, Palecek SP, Blackwell HE, Lynn DM. Slippery Antifouling Polymer Coatings Fabricated Entirely from Biodegradable and Biocompatible Components. ACS Appl Mater Interfaces 2022; 14:17940-17949. [PMID: 35394750 PMCID: PMC9310543 DOI: 10.1021/acsami.1c25218] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
We report the design of slippery liquid-infused porous surfaces (SLIPS) fabricated from building blocks that are biodegradable, edible, or generally regarded to be biocompatible. Our approach involves infusion of lubricating oils, including food oils, into nanofiber-based mats fabricated by electrospinning or blow spinning of poly(ε-caprolactone), a hydrophobic biodegradable polymer used widely in medical implants and drug delivery devices. This approach leads to durable and biodegradable SLIPS that prevent fouling by liquids and other materials, including microbial pathogens, on objects of arbitrary shape, size, and topography. This degradable polymer approach also provides practical means to design "controlled-release" SLIPS that release molecular cargo at rates that can be manipulated by the properties of the infused oils (e.g., viscosity or chemical structure). Together, our results provide new designs and introduce useful properties and behaviors to antifouling SLIPS, address important issues related to biocompatibility and environmental persistence, and thus advance new potential applications, including the use of slippery materials for food packaging, industrial and marine coatings, and biomedical implants.
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Affiliation(s)
- Harshit Agarwal
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, 1415 Engineering Dr., Madison, Wisconsin 53706, United States
| | - La'Darious J Quinn
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, Wisconsin 53706, United States
| | - Sahana C Walter
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, 1415 Engineering Dr., Madison, Wisconsin 53706, United States
| | - Thomas J Polaske
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, Wisconsin 53706, United States
| | - Douglas H Chang
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, 1415 Engineering Dr., Madison, Wisconsin 53706, United States
| | - Sean P Palecek
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, 1415 Engineering Dr., Madison, Wisconsin 53706, United States
| | - Helen E Blackwell
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, Wisconsin 53706, United States
| | - David M Lynn
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, 1415 Engineering Dr., Madison, Wisconsin 53706, United States
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, Wisconsin 53706, United States
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46
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Jia P, Wang F, Zeng W, Wang Z. A triphenylamine-based aggregation-enhanced emission probe for viscosity and polarity analysis of lubricating oils. Anal Methods 2022; 14:694-699. [PMID: 35043793 DOI: 10.1039/d1ay01957k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Lubricating oils offers abundant information about the operating state of machines. In this work, a donor-acceptor aggregation-enhanced emission fluorescent molecule, (Z)-4-(1-cyano-2-(4-(diphenylamino)phenyl)vinyl)benzonitrile (CPA-TPA), was synthesized to investigate its function to sense the viscosity and polarity of lubricant base oils. The results indicated that the molecule showed steadily-increased fluorescence emission with the base oil viscosity. In a mixture of poly-α-olefin/ester base oils, its optimal emission gradually red-shifted with the ester oil fraction, i.e., the polarity of the lubricant. A good correlation could be established between the emission intensity of the probe and the oil viscosity or between the optimal emission wavelength and the oil polarity. This demonstrates a dual-response fluorescent probe used for lubricating oil analysis and opens a new opportunity to develop a molecule-based method for the evaluation of lubricating oil quality.
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Affiliation(s)
- Pengxiao Jia
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.
- Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Eco-environmental Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, China
| | - Fu Wang
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.
| | - Wei Zeng
- Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Eco-environmental Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, China
| | - Zhaofeng Wang
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.
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47
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Yousefi H, Samani SE, Khan S, Prasad A, Shakeri A, Li Y, Filipe CDM, Didar TF. LISzyme Biosensors: DNAzymes Embedded in an Anti-biofouling Platform for Hands-free Real-Time Detection of Bacterial Contamination in Milk. ACS Nano 2022; 16:29-37. [PMID: 34872243 DOI: 10.1021/acsnano.1c05766] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Nonspecific binding is a significant challenge associated with biosensors in complex food textures. To overcome this, we have developed LISzymes, which are DNAzymes incorporated in lubricant-infused surfaces (LISs). Using milk as a complex background matrix, we show that LISzyme biosensors are significantly more effective in preventing nonspecific binding compared to other commonly used "blocking" methods. The use of lubricant infusion to treat sensing surfaces results in a 4-fold increase in the signal-to-noise ratio obtained with the DNAzyme with respect to untreated surfaces, when detecting the presence of specific bacteria in milk. This is a striking improvement upon previous DNAzyme sensors. We also show that the use of LISs does not affect the DNAzyme's ability to effectively and specifically detect its target─a protein specifically produced by Escherichia coli (E. coli), in a complex sample matrix such as milk. LISzymes drastically improve DNAzyme performance, resulting in target detection associated with E. coli at concentrations as low as 250 CFU/mL in milk in less than an hour, which is currently not possible using other optical platforms. LISzymes are promising tools for the real-time monitoring of food contamination and may prove valuable within many other biosensing applications.
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Affiliation(s)
- Hanie Yousefi
- Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario M5S 3M2, Canada
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48
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Dong Z, Qu X, Zhang L, Chen X, Dong Y, Chen H, Cui Y. Efficacy and Safety of Oxybuprocaine Hydrochloride Gel in Alleviating Pain during Male Urethral Catheterization: A Single-Center Randomized Controlled Study. Int J Clin Pract 2022; 2022:5734387. [PMID: 36177365 PMCID: PMC9492377 DOI: 10.1155/2022/5734387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Accepted: 08/18/2022] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND The purpose of this study was to determine whether oxybuprocaine hydrochloride gel could alleviate pain during male catheterization. METHODS Between September 2021 and March 2022, a randomized controlled trial was conducted at the Urology Department of Harbin Medical University Cancer Hospital (China). A total of 192 adult male patients requiring catheterization were enrolled and randomly assigned to one of two groups: 96 in the test group and 96 in the control group. The test group included patients who received oxybuprocaine hydrochloride gel as urethral lubricant, while patients in the control group received liquid paraffin. The preoperative and postoperative pain scores were compared using nonparametric tests. RESULTS At the baseline, there was no significant difference between the two groups. There was no significant difference in preoperative pain scores between the test group (mean ± SD = 20.04 ± 2.68 mm) and the control group (mean ± SD = 20.21 ± 3.23 mm) (p=0.694). Postoperative pain scores increased significantly in the test (mean ± SD = 31.98 ± 2.57 mm, p < 0.001) and control groups (mean ± SD = 38.96 ± 2.02 mm, p < 0.001) groups. Postoperative pain scores were significantly lower in the test group (mean ± SD = 31.98 ± 2.57 mm) than those in the control group (mean ± SD = 38.96 ± 2.02 mm (p < 0.001). CONCLUSIONS The use of oxybuprocaine hydrochloride gel significantly reduced pain during male urethral catheterization. The study provides evidence for clinicians to use oxybuprocaine hydrochloride gel during male catheterization.
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Affiliation(s)
- Zhenkun Dong
- Department of Urology, Harbin Medical University Cancer Hospital, Harbin, China
| | - Xutong Qu
- Department of Anesthesiology, Harbin Medical University Cancer Hospital, Harbin, China
| | - Lu Zhang
- Department of Urology, Harbin Medical University Cancer Hospital, Harbin, China
| | - Xueting Chen
- Department of Urology, Harbin Medical University Cancer Hospital, Harbin, China
| | - Yuhang Dong
- Department of Urology, Harbin Medical University Cancer Hospital, Harbin, China
| | - Hui Chen
- Department of Urology, Harbin Medical University Cancer Hospital, Harbin, China
| | - Yan Cui
- Department of Urology, Harbin Medical University Cancer Hospital, Harbin, China
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49
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Abstract
Surface-attached layers of phosphatidylcholine (PC) lipid vesicles (liposomes) may reduce the friction coefficient μ (= force-to-slide/load) between the sliding surfaces down to μ ≈ 10−3–10−4 up to tens of atm contact pressures, as high as those in the major joints (hips or knees). Such friction reduction is attributed to hydration lubrication by the highly-hydrated phosphocholine head-groups exposed at the outer vesicle surfaces. It has been suggested therefore that intra-articular (IA) administration of liposomes as potential boundary lubricants may alleviate degenerative, friction-associated joint conditions such as osteoarthritis (OA), which is associated with insufficient lubrication at the articular cartilage surface. To overcome the problem, common to all nanoparticles, of rapid removal by the mononuclear phagocyte system, as well as to ensure long-term colloidal stability during storage, functionalizing liposomes with poly(ethylene glycol) moieties, PEGylation, is often used. Here we describe a different liposome functionalization approach, using poly(2-methacryloyloxyethyl phosphorylcholine), PMPC, moieties (strictly, lipid–PMPC conjugates), and compare the retention time in mice joints of such PMPCylated liposomes with otherwise-identical but PEGylated vesicles following IA administration. We find, using fluorescence labeling and in vivo optical imaging, that when PMPC-stabilized liposomes are injected into mice knee joints, there is a massive increase of the vesicles’ retention half-life in the joints of about (4–5)-fold (ca. 300–400% increase in retention time) compared with the PEGylated liposomes (and some 100-fold longer than the retention time of intra-articularly injected hyaluronan or HA). Such PMPCylated liposomes are therefore promising candidates as potential long-lived boundary lubricants at the articular cartilage surface, with implication for friction-associated pathologies. Moreover, as lipid vesicles are well known to be efficient drug carriers, such long retention in the joints may enable analgesic or anti-inflammatory agents for joint pathologies to be more efficiently delivered via IA administration using PMPCylated liposomal vehicles relative to PEGylated ones. PMPCylated liposomes injected into mice joints show a massive increase in retention half-life compared with PEGylated liposomes (or hyaluronan, HA), making them promising candidates as boundary lubricants at articular cartilage, or as drug carriers.![]()
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Affiliation(s)
- Weifeng Lin
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 76100, Israel.
| | - Ronit Goldberg
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 76100, Israel.
| | - Jacob Klein
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 76100, Israel.
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50
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Tranová T, Macho O, Loskot J, Mužíková J. Study of rheological and tableting properties of lubricated mixtures of co-processed dry binders for orally disintegrating tablets. Eur J Pharm Sci 2022; 168:106035. [PMID: 34634469 DOI: 10.1016/j.ejps.2021.106035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Revised: 08/30/2021] [Accepted: 10/06/2021] [Indexed: 11/19/2022]
Abstract
Co-processed dry binders for ODTs are important multifunctional excipients for tablet manufacturing by direct compression. Testing their binary mixtures with lubricants is an important aspect of their use in combination with drugs. The aim of this study was to evaluate the rheological and compression properties of lubricated mixtures of co-processed dry binders Parteck® ODT, Prosolv® ODT G2 and Ludiflash®, and subsequently also the compactability and disintegration time of the tablets made thereof. The lubricants employed were magnesium stearate and sodium stearyl fumarate in the concentrations of 0.5% and 1%. The best flowability was shown by Prosolv® ODT G2 combined with magnesium stearate in the concentration of 0.5%. Lubricated mixtures with Prosolv® ODT G2 showed a lower angle of internal friction as well as lower pre-compression energy values. The values of plastic deformation energy were the highest in the case of Prosolv® ODT G2, which was also reflected in the highest tablet strength. On the contrary, the ejection force values were the lowest for this co-processed dry binder. Magnesium stearate reduced the ejection force more effectively than sodium stearyl fumarate. Prosolv® ODT G2 tablets exhibited the highest tensile strength and shortest disintegration time.
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Affiliation(s)
- Thao Tranová
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Charles University, Akademika Heyrovského 1203, 500 05 Hradec Králové, Czech Republic
| | - Oliver Macho
- Institute of Process Engineering, Faculty of Mechanical Engineering, Slovak University of Technology in Bratislava, Nám. slobody 17, 812 31 Bratislava 1, Slovakia.
| | - Jan Loskot
- Department of Physics, Faculty of Science, University of Hradec Králové, Rokitanského 62, 500 03 Hradec Králové, Czech Republic
| | - Jitka Mužíková
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Charles University, Akademika Heyrovského 1203, 500 05 Hradec Králové, Czech Republic
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