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Yang H, Zhang F, Fan Y, Zhang J, Fang T, Xing D, Zhen Y, Nie Z, Liu Y, Wang D, Li J. Co-delivery of Brinzolamide and Timolol from Micelles-laden Contact Lenses: In vitro and In Vivo Evaluation. Pharm Res 2024; 41:531-546. [PMID: 38366235 DOI: 10.1007/s11095-024-03672-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Accepted: 01/28/2024] [Indexed: 02/18/2024]
Abstract
PURPOSE Traditional eye drops exhibit a modest bioavailability ranging from 1 to 5%, necessitating recurrent application. Thus, a contact lens-based drug delivery system presents substantial benefits. Nonetheless, pharmaceutical agents exhibiting poor solubility may compromise the quintessential characteristics of contact lenses and are, consequently, deemed unsuitable for incorporation. To address this issue, the present study has engineered a novel composite drug delivery system that amalgamates micellar technology with contact lenses, designed specifically for the efficacious conveyance of timolol and brinzolamide. METHODS Utilizing mPEG-PCL as the micellar material, this study crafted mPEG-PCL micelles loaded with brinzolamide and timolol through the film hydration technique. The micelle-loaded contact lens was fabricated employing the casting method; a uniform mixture of HEMA and EGDMA with the mPEG-PCL micelles enshrouding brinzolamide and timolol was synthesized. Following the addition of a photoinitiator, 50 μL of the concoction was deposited into a contact lens mold. Subsequently, the assembly was subjected to polymerization under 365 nm ultraviolet light for 35 min, resulting in the formation of the micelle-loaded contact lenses. RESULTS In the present article, we delineate the construction of a micelle-loaded contact lens designed for the administration of brinzolamide and timolol in the treatment of glaucoma. The study characterizes crucial properties of the micelle-loaded contact lenses, such as transmittance and ionic permeability. It was observed that these vital attributes meet the standard requirements for contact lenses. In vitro release studies revealed that timolol and brinzolamide could be gradually liberated over periods of up to 72 and 84 h, respectively. In vivo pharmacodynamic evaluation showed a significant reduction in intraocular pressure and a relative bioavailability of 10.84 times that of commercially available eye drops. In vivo pharmacokinetic evaluation, MRT was significantly increased, and the bioavailability of timolol and brinzolamide was 2.71 and 1.41 times that of eye drops, respectively. Safety assessments, including in vivo irritation, histopathological sections, and protein adsorption studies, were conducted as per established protocols, confirming that the experiments were in compliance with safety standards. IN CONCLUSION The manuscript delineates the development of a safe and efficacious micelle-loaded contact lens drug delivery system, which presents a novel therapeutic alternative for the management of glaucoma.
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Affiliation(s)
- Hongyu Yang
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, No. 103, Wenhua Road, Shenyang, 110016, People's Republic of China
| | - Faxing Zhang
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, No. 103, Wenhua Road, Shenyang, 110016, People's Republic of China
| | - Yingzhen Fan
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, No. 103, Wenhua Road, Shenyang, 110016, People's Republic of China
| | - Jian Zhang
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, No. 103, Wenhua Road, Shenyang, 110016, People's Republic of China
| | - Ting Fang
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, No. 103, Wenhua Road, Shenyang, 110016, People's Republic of China
| | - Dandan Xing
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, No. 103, Wenhua Road, Shenyang, 110016, People's Republic of China
| | - Yanli Zhen
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, No. 103, Wenhua Road, Shenyang, 110016, People's Republic of China
| | - Zhihao Nie
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, No. 103, Wenhua Road, Shenyang, 110016, People's Republic of China
| | - Yaming Liu
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, No. 103, Wenhua Road, Shenyang, 110016, People's Republic of China
| | - Dongkai Wang
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, No. 103, Wenhua Road, Shenyang, 110016, People's Republic of China.
| | - Ji Li
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, No. 103, Wenhua Road, Shenyang, 110016, People's Republic of China.
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2
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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] [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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3
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Costa D, De Matteis V, Treso F, Montani G, Martino M, Rinaldi R, Corrado M, Cascione M. Impact of the physical properties of contact lens materials on the discomfort: role of the coefficient of friction. Colloids Surf B Biointerfaces 2024; 233:113630. [PMID: 37956592 DOI: 10.1016/j.colsurfb.2023.113630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 10/31/2023] [Accepted: 11/01/2023] [Indexed: 11/15/2023]
Abstract
Contact Lens Discomfort (CLD) is the main cause in contact lens (CLs) discontinuation, referred in literature as drop-out phenomenon. Despite such evidence was reported in several clinical studies, a relationship between physico-chemical properties of CLs and CLD is not still totally understood. In this regard, the friction of CLs surfaces seems to be related to discomfort feeling events, probably due to an alteration of the lubricate function of the tear film after the CL placement inside the ocular environment. In the last years, many studies have been finalized to the friction measurements of CLs surface, finding conflicting data due to a lack in standardized protocol. The aim of this review is primarily to show evident relationships between CLs surface properties (i.e. wettability, tear evaporation, tear film quality, etc.) and the coefficient of friction (CoF), resulting therefore the most relevant physical quantity in the CLs characterization. In addition, we reported the most recent studies in CLs tribology, which highlight that the introduction of a standard protocol in CoF measurements is necessary to obtain reproducible results, considering the aim to evaluate in a more precise way the relationship between this material surface property and comfort in CLs users.
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Affiliation(s)
- D Costa
- Department of Mathematics and Physics "Ennio De Giorgi", University of Salento, Via Arnesano, Lecce 73100, Italy
| | - V De Matteis
- Department of Mathematics and Physics "Ennio De Giorgi", University of Salento, Via Arnesano, Lecce 73100, Italy; Institute for Microelectronics and Microsystems (IMM), CNR, Via Monteroni, Lecce 73100, Italy.
| | - F Treso
- Department of Mathematics and Physics "Ennio De Giorgi", University of Salento, Via Arnesano, Lecce 73100, Italy; Centro di Ricerca in Contattologia Avanzata, Via Arnesano, Lecce 73100, Italy
| | - G Montani
- Department of Mathematics and Physics "Ennio De Giorgi", University of Salento, Via Arnesano, Lecce 73100, Italy; Centro di Ricerca in Contattologia Avanzata, Via Arnesano, Lecce 73100, Italy
| | - M Martino
- Department of Mathematics and Physics "Ennio De Giorgi", University of Salento, Via Arnesano, Lecce 73100, Italy; Centro di Ricerca in Contattologia Avanzata, Via Arnesano, Lecce 73100, Italy
| | - R Rinaldi
- Department of Mathematics and Physics "Ennio De Giorgi", University of Salento, Via Arnesano, Lecce 73100, Italy; Institute for Microelectronics and Microsystems (IMM), CNR, Via Monteroni, Lecce 73100, Italy
| | - M Corrado
- Department of Mathematics and Physics "Ennio De Giorgi", University of Salento, Via Arnesano, Lecce 73100, Italy
| | - M Cascione
- Department of Mathematics and Physics "Ennio De Giorgi", University of Salento, Via Arnesano, Lecce 73100, Italy; Institute for Microelectronics and Microsystems (IMM), CNR, Via Monteroni, Lecce 73100, Italy; Centro di Ricerca in Contattologia Avanzata, Via Arnesano, Lecce 73100, Italy.
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4
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Fu Y, Luo Y, Chen X, Tong Y, Zhu Y, Yang L. Atropine-eluting silicone contact lenses for myopia control. J Biomater Appl 2023; 37:1724-1735. [PMID: 37083186 DOI: 10.1177/08853282231166858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/22/2023]
Abstract
Myopia, also known as nearsightedness, is one of the prime reasons for vision impairment worldwide. Atropine in topical ophthalmic solutions (e.g., 0.01% atropine sulfate eye drops) is the primary medical treatment for controlling myopia, especially for pseudomyopia or true myopia in rapid progress. However, aqueous atropine solution is unstable and easily breaks down to tropic acid, which will result in vision blur. Drug-eluting contact lenses (CLs) have been explored as a potentially superior alternative to effectively control the drug release and improve the drug efficacy. In this work, an atropine-eluting contact lens was developed by encapsulating an atropine implant in a silicon-based contact lens, towards functioning in vision correction and controlling myopia. The safety and effectiveness of this atropine-eluting contact lens were verified with rabbit and guinea pig models. The results showed that the lenses reduced the side effects like mydriasis and no other adverse events were observed in rabbit eyes. More importantly, atropine-loaded lenses could effectively delay the progress of form-deprivation myopia with guinea pig eyes as the model. Thus, we concluded that atropine-eluting CLs prepared by implantation technology may be an option for the treatment of myopia.
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Affiliation(s)
- Yan Fu
- Affiliated Hospital of Medical School Ningbo University, Ningbo, China
- School of medicine, Ningbo University, Ningbo, China
| | - Yang Luo
- Affiliated Hospital of Medical School Ningbo University, Ningbo, China
- School of medicine, Ningbo University, Ningbo, China
| | - Xi Chen
- Affiliated Hospital of Medical School Ningbo University, Ningbo, China
| | - Yao Tong
- Affiliated Hospital of Medical School Ningbo University, Ningbo, China
- School of medicine, Ningbo University, Ningbo, China
| | - Yabin Zhu
- School of medicine, Ningbo University, Ningbo, China
| | - Lu Yang
- Affiliated Hospital of Medical School Ningbo University, Ningbo, China
- School of medicine, Ningbo University, Ningbo, China
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5
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Chau Thuy Nguyen D, Dowling J, Ryan R, McLoughlin P, Fitzhenry L. Controlled release of naringenin from soft hydrogel contact lens: An investigation into lens critical properties and in vitro release. Int J Pharm 2022; 621:121793. [DOI: 10.1016/j.ijpharm.2022.121793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 04/28/2022] [Accepted: 04/29/2022] [Indexed: 11/16/2022]
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6
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Ţălu Ş. Advanced morphological analysis of siloxane-hydrogel contact lenses. Microsc Res Tech 2021; 84:2702-2715. [PMID: 34036670 DOI: 10.1002/jemt.23833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 04/29/2021] [Accepted: 05/06/2021] [Indexed: 02/05/2023]
Abstract
The purpose of this work is to provide a better understanding of three-dimensional (3-D) surface texture of siloxane-hydrogel contact lenses (CLs) using atomic force microscopy (AFM) and stereometric analysis. The 3-D surface texture characterization of unworn/worn siloxane-hydrogel CLs made of Filcon V (I FDA group) was performed with stereometric analysis. The atomic force microscopy (AFM) measurements of surface roughness and micromorphology of CLs were made using a Nanoscope V MultiMode (Bruker) in intermittent-contact mode, in air, on square areas of 5 × 5 μm. Stereometric study of 3-D surface texture was made according with ISO 25178-2:2012 for CLrins (taken from the blister and rinsed with deionized water); CLss (preserved for 12 hr in saline solution and rinsed with deionized water); CLworn-smooth (worn for 8 hr and presenting the smooth type morphology), and CLworn-sharp (worn for 8 hr and presenting the sharp-type morphology). The 3-D surface texture of siloxane-hydrogel CLs was found to have specific morphological characteristics. Statistical parameters revealed local geometrical and morphological spatial structures at nanometer scale attributed to the specific interactions at the CLs surface. Before wear, the surface micromorphology of Filcon V CLs is regular with uniformly distributed microasperities and relatively small heights (Sq = 0.6 nm). After 12 hr in saline, it is found that the micromorphology changes relatively easily, but retaining the main morphological characteristics (Sq = 1.2 nm). After 8 hr of wear, there are two typical micromorphologies: smooth type, characterized by gutter structures and isolated microasperities (Sq = 2.5 nm), while the sharp type has an appearance with compactly arranged microasperities of hill type flanked by compactly arranged microregions of valley type (Sq = 2.2 nm). Surface statistical parameters allow manufacturers in developing the next generation of CLs with improved surface texture while improving biocompatibility and minimizing the impact of the material on corneal physiology. Furthermore, the micro-elastohydrodynamic lubrication due to surface texture at a nanometer scale between the back surface of the CL with the corneal surface and the front surface of the CL with the under-surface of the eyelid can be deeper and more nuanced to understand in light of modern tribological theories.
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Affiliation(s)
- Ştefan Ţălu
- The Directorate of Research, Development and Innovation Management (DMCDI), Technical University of Cluj-Napoca, Cluj-Napoca, Romania
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7
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Kalirajan C, Dukle A, Nathanael AJ, Oh TH, Manivasagam G. A Critical Review on Polymeric Biomaterials for Biomedical Applications. Polymers (Basel) 2021; 13:3015. [PMID: 34503054 PMCID: PMC8433665 DOI: 10.3390/polym13173015] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 09/01/2021] [Accepted: 09/02/2021] [Indexed: 12/18/2022] Open
Abstract
Natural and synthetic polymers have been explored for many years in the field of tissue engineering and regeneration. Researchers have developed many new strategies to design successful advanced polymeric biomaterials. In this review, we summarized the recent notable advancements in the preparation of smart polymeric biomaterials with self-healing and shape memory properties. We also discussed novel approaches used to develop different forms of polymeric biomaterials such as films, hydrogels and 3D printable biomaterials. In each part, the applications of the biomaterials in soft and hard tissue engineering with their in vitro and in vivo effects are underlined. The future direction of the polymeric biomaterials that could pave a path towards successful clinical implications is also underlined in this review.
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Affiliation(s)
- Cheirmadurai Kalirajan
- Centre for Biomaterials, Cellular and Molecular Theranostics (CBCMT), Vellore Institute of Technology (VIT), Vellore 632014, Tamil Nadu, India; (C.K.); (A.D.); (G.M.)
| | - Amey Dukle
- Centre for Biomaterials, Cellular and Molecular Theranostics (CBCMT), Vellore Institute of Technology (VIT), Vellore 632014, Tamil Nadu, India; (C.K.); (A.D.); (G.M.)
| | - Arputharaj Joseph Nathanael
- Centre for Biomaterials, Cellular and Molecular Theranostics (CBCMT), Vellore Institute of Technology (VIT), Vellore 632014, Tamil Nadu, India; (C.K.); (A.D.); (G.M.)
| | - Tae-Hwan Oh
- School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Korea
| | - Geetha Manivasagam
- Centre for Biomaterials, Cellular and Molecular Theranostics (CBCMT), Vellore Institute of Technology (VIT), Vellore 632014, Tamil Nadu, India; (C.K.); (A.D.); (G.M.)
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8
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Nguyen DCT, Dowling J, Ryan R, McLoughlin P, Fitzhenry L. Pharmaceutical-loaded contact lenses as an ocular drug delivery system: A review of critical lens characterization methodologies with reference to ISO standards. Cont Lens Anterior Eye 2021; 44:101487. [PMID: 34353748 DOI: 10.1016/j.clae.2021.101487] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 06/28/2021] [Accepted: 07/04/2021] [Indexed: 01/12/2023]
Abstract
Therapeutic contact lenses for ocular drug delivery have received considerable interest as they can potentially enhance ocular bioavailability, increase patient compliance, and reduce side effects. Along with the successful in vitro and in vivo studies on sustained drug delivery through contact lenses, lens critical properties such as water content, optical transparency and modulus have also been investigated. Aside from issues such as drug stability or burst release, the potential for the commercialization of pharmaceutical-loaded lenses can be limited by the alteration of lens physical and chemical properties upon the incorporation of therapeutic or non-therapeutic components. This review outlines advances in the use of pharmaceutical-loaded contact lenses and their relevant characterization methodologies as a potential ocular drug delivery system from 2010 to 2020, while summarizing current gaps and challenges in this field. A key reference point for this review is the relevant ISO standards on contact lenses, relating to the associated characterization methodologies. The content of this review is categorized based on the chemical, physical and mechanical properties of the loaded lens with the shortcomings of such analytical technologies examined.
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Affiliation(s)
- Dan Chau Thuy Nguyen
- Ocular Therapeutics Research Group (OTRG), Pharmaceutical & Molecular Biotechnology Research Centre (PMBRC), Waterford Institute of Technology, Waterford City, County Waterford X91 K0EK, Ireland.
| | - Joseph Dowling
- Research and Development Department, Bausch + Lomb Ireland Ltd., Waterford City, County Waterford X91 V383, Ireland
| | - Richie Ryan
- Ocular Therapeutics Research Group (OTRG), Pharmaceutical & Molecular Biotechnology Research Centre (PMBRC), Waterford Institute of Technology, Waterford City, County Waterford X91 K0EK, Ireland
| | - Peter McLoughlin
- Ocular Therapeutics Research Group (OTRG), Pharmaceutical & Molecular Biotechnology Research Centre (PMBRC), Waterford Institute of Technology, Waterford City, County Waterford X91 K0EK, Ireland
| | - Laurence Fitzhenry
- Ocular Therapeutics Research Group (OTRG), Pharmaceutical & Molecular Biotechnology Research Centre (PMBRC), Waterford Institute of Technology, Waterford City, County Waterford X91 K0EK, Ireland
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9
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Tran NPD, Yang MC, Tran-Nguyen PL. Evaluation of silicone hydrogel contact lenses based on poly(dimethylsiloxane) dialkanol and hydrophilic polymers. Colloids Surf B Biointerfaces 2021; 206:111957. [PMID: 34216853 DOI: 10.1016/j.colsurfb.2021.111957] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 06/25/2021] [Accepted: 06/26/2021] [Indexed: 12/01/2022]
Abstract
Silicone hydrogel lenses were prepared by copolymerizing PDMS-PEGMA macromer (PGP) with various combinations of DMA, NVP, and PEGMA through UV initiated polymerization process. The resultant PGP macromer were characterized by gel permeation chromatography (GPC), and scanning electron microscope (SEM-EDS). Characterization of all the resultant co-polymers included Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), equilibrium water content (EWC), oxygen permeability (Dk), optical transparency, contact angle, mechanical properties, zeta potential, protein deposition, and cytotoxicity. The results show that higher content of hydrophilic polymers increased water uptake ability as well as improved hydrophilicity and modulus of silicone hydrogel lenses; however, oxygen permeability decreased with the decrease of PDMS content (145 barrers of PGP to 37 barrers of DP0). In addition, these silicone hydrogel lenses exhibited relatively optical transparency, anti-protein deposition, and non-cytotoxic according to an in vitro L929 fibroblast assay. Therefore, these silicone hydrogel polymers would be applicable for making contact lens.
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Affiliation(s)
- Nguyen-Phuong-Dung Tran
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Ming-Chien Yang
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
| | - Phuong Lan Tran-Nguyen
- Department of Mechanical Engineering, Can Tho University, 3/2 Street, Cantho City, Viet Nam
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10
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Li Z, Cheng H, Ke L, Liu M, Wang C, Jun Loh X, Li Z, Wu Y. Recent Advances in New Copolymer Hydrogel‐Formed Contact Lenses for Ophthalmic Drug Delivery. CHEMNANOMAT 2021. [DOI: 10.1002/cnma.202100008] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Zhiguo Li
- Fujian Provincial Key Laboratory of Innovative Drug Target Research and State Key Laboratory of Cellular Stress Biology School of Pharmaceutical Sciences Xiamen University Xiamen 361102 P. R. China
| | - Hongwei Cheng
- Fujian Provincial Key Laboratory of Innovative Drug Target Research and State Key Laboratory of Cellular Stress Biology School of Pharmaceutical Sciences Xiamen University Xiamen 361102 P. R. China
| | - Lingjie Ke
- Fujian Provincial Key Laboratory of Innovative Drug Target Research and State Key Laboratory of Cellular Stress Biology School of Pharmaceutical Sciences Xiamen University Xiamen 361102 P. R. China
| | - Minting Liu
- Fujian Provincial Key Laboratory of Innovative Drug Target Research and State Key Laboratory of Cellular Stress Biology School of Pharmaceutical Sciences Xiamen University Xiamen 361102 P. R. China
| | - Chen‐Gang Wang
- Institute of Materials Research and Engineering A*STAR (Agency for Science, Technology and Research) 2 Fusionopolis Way, Innovis, #08-03 Singapore 138634 Singapore
| | - Xian Jun Loh
- Institute of Materials Research and Engineering A*STAR (Agency for Science, Technology and Research) 2 Fusionopolis Way, Innovis, #08-03 Singapore 138634 Singapore
| | - Zibiao Li
- Institute of Materials Research and Engineering A*STAR (Agency for Science, Technology and Research) 2 Fusionopolis Way, Innovis, #08-03 Singapore 138634 Singapore
| | - Yun‐Long Wu
- Fujian Provincial Key Laboratory of Innovative Drug Target Research and State Key Laboratory of Cellular Stress Biology School of Pharmaceutical Sciences Xiamen University Xiamen 361102 P. R. China
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11
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Optimization of zero-shear viscosity for HPAM-Polystyrene microspheres formulations through experimental design approach. JOURNAL OF POLYMER RESEARCH 2021. [DOI: 10.1007/s10965-021-02473-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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12
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Ishihara K, Fukazawa K, Sharma V, Liang S, Shows A, Dunbar DC, Zheng Y, Ge J, Zhang S, Hong Y, Shi X, Wu JY. Antifouling Silicone Hydrogel Contact Lenses with a Bioinspired 2-Methacryloyloxyethyl Phosphorylcholine Polymer Surface. ACS OMEGA 2021; 6:7058-7067. [PMID: 33748619 PMCID: PMC7970573 DOI: 10.1021/acsomega.0c06327] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 02/03/2021] [Indexed: 05/24/2023]
Abstract
Inspired by the cell membrane surface as well as the ocular tissue, a novel and clinically applicable antifouling silicone hydrogel contact lens material was developed. The unique chemical and biological features on the surface on a silicone hydrogel base substrate were achieved by a cross-linked polymer layer composed of 2-methacryloyloxyethyl phosphorylcholine (MPC), which was considered important for optimal on-eye performance. The effects of the polymer layer on adsorption of biomolecules, such as lipid and proteins, and adhesion of cells and bacteria were evaluated and compared with several conventional silicone hydrogel contact lens materials. The MPC polymer layer provided significant resistance to lipid deposition as visually demonstrated by the three-dimensional confocal images of whole contact lenses. Also, fibroblast cell adhesion was decreased to a 1% level compared with that on the conventional silicone hydrogel contact lenses. The movement of the cells on the surface of the MPC polymer-modified lens material was greater compared with other silicone hydrogel contact lenses indicating that lubrication of the contact lenses on ocular tissue might be improved. The superior hydrophilic nature of the MPC polymer layer provides improved surface properties compared to the underlying silicone hydrogel base substrate.
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Affiliation(s)
- Kazuhiko Ishihara
- Department
of Materials Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kyoko Fukazawa
- Department
of Materials Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Vinay Sharma
- Alcon
Vision LLC, Fort Worth, Texas 76134, United States
| | - Shuang Liang
- Alcon
Vision LLC, Fort Worth, Texas 76134, United States
| | - Amanda Shows
- Alcon
Vision LLC, Fort Worth, Texas 76134, United States
| | | | - Yang Zheng
- Alcon
Vision LLC, Duluth, Georgia 30097, United
States
| | - Junhao Ge
- Alcon
Vision LLC, Duluth, Georgia 30097, United
States
| | - Steve Zhang
- Alcon
Vision LLC, Duluth, Georgia 30097, United
States
| | - Ye Hong
- Alcon
Vision LLC, Duluth, Georgia 30097, United
States
| | - Xinfeng Shi
- Alcon
Vision LLC, Fort Worth, Texas 76134, United States
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13
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Fořt J, Migas P, Černý R. Effect of Absorptivity of Superabsorbent Polymers on Design of Cement Mortars. MATERIALS (BASEL, SWITZERLAND) 2020; 13:ma13235503. [PMID: 33276657 PMCID: PMC7731020 DOI: 10.3390/ma13235503] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 11/25/2020] [Accepted: 11/30/2020] [Indexed: 06/12/2023]
Abstract
The functional properties of composites modified by superabsorbent polymers (SAPs) strongly depend on the swelling capacity of applied SAPs. In this sense, three types of commercially available SAPs namely Cablock CT, Hydropam, and Creasorb SIS with different chemical composition and particle size distribution were studied in this manuscript to reveal the differences in absorptivity as can be viewed as pretests for their utilization in concrete composites. In addition, absorptivity in distilled water, tap water, and 0.1 M NaCl solution are examined for determining the SAPs response for the change of the solution pH. To overcome problems with the teabag method inaccuracy, the new method is introduced. Besides to quantitative evaluation of the SAPs absorptivity, the correlation for the absorption and desorption period as the function of SAPs residence time within the examined solution is proposed. To access the effect of selected SAPs on functional properties, optimization based on the flow table test is employed and mechanical parameters are determined after 7, 14, 28, and 90 days of curing. Obtained results refer to substantial differences between particular SAPs and contribute to the understanding of the effect of SAP on the functional properties of cement-based materials.
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Affiliation(s)
- Jan Fořt
- Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 16629 Prague, Czech Republic; (P.M.); (R.Č.)
| | - Przemysław Migas
- Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 16629 Prague, Czech Republic; (P.M.); (R.Č.)
- Faculty of Chemical Engineering and Technology, Cracow University of Technology, Warszawska 24, 31155 Cracow, Poland
| | - Robert Černý
- Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 16629 Prague, Czech Republic; (P.M.); (R.Č.)
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14
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Silva D, de Sousa HC, Gil MH, Santos LF, Amaral RA, Saraiva JA, Salema-Oom M, Alvarez-Lorenzo C, Serro AP, Saramago B. Imprinted hydrogels with LbL coating for dual drug release from soft contact lenses materials. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 120:111687. [PMID: 33545849 DOI: 10.1016/j.msec.2020.111687] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 10/25/2020] [Accepted: 10/27/2020] [Indexed: 12/17/2022]
Abstract
A combined strategy to control the release of two drugs, one anti-inflammatory (diclofenac sodium, DCF) and one antibiotic (moxifloxacin hydrochloride, MXF), from a soft contact lens (SCL) material, was assessed. The material was a silicone-based hydrogel, which was modified by molecular imprinting with MXF and coated by the layer-by-layer (LbL) method using natural polyelectrolytes: alginate (ALG), poly-l-lysine (PLL) and hyaluronate (HA), crosslinked with 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC). Imprinting was used to increase the amount of MXF loaded and to sustain its release, while the LbL coating acted as a diffusion barrier for DCF and improved the surface properties. The drugs were loaded by soaking in a DCF + MXF dual solution. High hydrostatic pressure (HHP) was successfully applied in the sterilization of the drug-loaded hydrogels. The transmittance, refractive index, wettability and ionic permeability of the hydrogels remained within the required levels for SCLs application. The concentrations of the released DCF and MXF stayed above the IC50 and the MIC (for S. aureus and S. epidermidis) values, for 9 and 10 days, respectively. No ocular irritancy was detected by the HET-CAM test. NIH/3T3 cell viability demonstrated that the drug-loaded hydrogels were not toxic, and cell adhesion was reduced.
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Affiliation(s)
- Diana Silva
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Hermínio C de Sousa
- CIEPQPF, Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II - Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Maria Helena Gil
- CIEPQPF, Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II - Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Luís F Santos
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Renata A Amaral
- LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Jorge A Saraiva
- LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Madalena Salema-Oom
- CIIEM, Instituto Superior de Ciências da Saúde Egas Moniz, Campus Universitário, Quinta da Granja, Monte de Caparica, 2829-511 Caparica, Portugal
| | - Carmen Alvarez-Lorenzo
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, I+D Farma (GI-1645), Facultad de Farmacia and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Ana Paula Serro
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av Rovisco Pais, 1049-001 Lisboa, Portugal; CIIEM, Instituto Superior de Ciências da Saúde Egas Moniz, Campus Universitário, Quinta da Granja, Monte de Caparica, 2829-511 Caparica, Portugal
| | - Benilde Saramago
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av Rovisco Pais, 1049-001 Lisboa, Portugal.
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15
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Havuz E, Gokmen O. In-vitro dewetting properties of planned replacement and daily disposable silicone hydrogel contact lenses. Cont Lens Anterior Eye 2020; 44:101377. [PMID: 33109471 DOI: 10.1016/j.clae.2020.10.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 09/23/2020] [Accepted: 10/08/2020] [Indexed: 11/15/2022]
Abstract
AIM To compare the in-vitro videokeratoscopic surface dewetting properties of new-generation silicone hydrogel (SiH) planned replacement contact lenses (CL) with those of daily disposable CLs. METHOD A chrome coated cornea model was used for the in-vitro evaluation of surface dewetting. Pre-lens and post-lens film layers were formed by instilling a normal preservative-free normal saline solution (PFNs) (0.9 %) before and after the placement of the CL on the model cornea. The tests were carried out on fanfilcon A, lotrafilcon B, samfilcon A, and senofilcon A lenses, as well as such daily disposable lenses as delefilcon, nesofilcon A and senofilcon one day. Using videokeratoscopic methods, images were obtained at 30-second intervals up to 180 s in the lens and control groups and were analyzed by the ImajeJ® program. RESULTS The mean measured area of the keratoscopic rings was largest in the fanfilcon group (67.56 mm2), followed by 61.53 mm2 in the lotrafilcon A group and 64.60 mm2 in the samfilcon group, while the smallest area was measured in the senofilcon A group, at 56.90 mm2. The area was measured as 64.33, 63.09 and 68.39 mm2 for the delefilcon, nesofilcon and Senofilcon one day CLs, respectively. The dewetting patterns and properties differed in the CL groups (p < 0.05), while no significant differences were found between the measured areas of the planned replacement and daily disposable CL groups (p > 0.05). DISCUSSION Videokeratoscopy using in-vitro cornea models has been identified as a reproducible and reliable method for the analysis of the surface dewetting of CLs. The dewetting characteristics of CL groups have been found to differ from each other, despite all being produced from SiH materials. The surface wetting coating has been shown to affect CL dewetting performance.
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Affiliation(s)
- Erol Havuz
- Health Sciences University Samsun Training and Research Hospital, Department of Ophthalmology Samsun, Turkey
| | - Onur Gokmen
- Department of Ophthalmology, Van Yuzuncu Yil University, Faculty Of Medicine, Turkey.
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16
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Tran NPD, Ting CC, Lin CH, Yang MC. A Novel Approach to Increase the Oxygen Permeability of Soft Contact Lenses by Incorporating Silica Sol. Polymers (Basel) 2020; 12:polym12092087. [PMID: 32937918 PMCID: PMC7569976 DOI: 10.3390/polym12092087] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 09/07/2020] [Accepted: 09/11/2020] [Indexed: 12/04/2022] Open
Abstract
This study presents a novel approach to increase the oxygen permeability of hydrogel by the addition of silica sol. Herein, 2-hydroxyethyl methacrylate (HEMA) was copolymerized with N-vinyl-2-pyrrolidone (NVP) after mixing with silica sol. The resultant hydrogel was subject to characterizations including Fourier-transform infrared (FTIR), equilibrium water content (EWC), contact angle, optical transmittance, oxygen permeability (Dk), tensile test, anti-deposition of proteins, and cytotoxicity. The results showed that with the increase of silica content, the Dk values and Young’s moduli increased, the optical transmittance decreased slightly, whereas the EWC and contact angle, and protein deposition were not much affected. Moreover, the cytotoxicity of the resultant poly(HEMA-co-NVP)-SNPs indicated that the presence of silica sol was non-toxic and caused no effect to the growth of L929 cells. Thus, this approach increased the Dk of soft contact lenses without affecting their hydrophilicity.
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Affiliation(s)
| | | | | | - Ming-Chien Yang
- Correspondence: ; Tel.: +886-2-2737-6528; Fax: +886-2-2737-6544
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17
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Silva D, de Sousa HC, Gil MH, Santos LF, Moutinho GM, Salema-Oom M, Alvarez-Lorenzo C, Serro AP, Saramago B. Diclofenac sustained release from sterilised soft contact lens materials using an optimised layer-by-layer coating. Int J Pharm 2020; 585:119506. [PMID: 32512224 DOI: 10.1016/j.ijpharm.2020.119506] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 06/01/2020] [Accepted: 06/02/2020] [Indexed: 11/25/2022]
Abstract
A layer-by-layer (LbL) coating was designed using ionic polysaccharides (chitosan, sodium alginate, sodium hyaluronate) and genipin (crosslinker), to sustain the release of diclofenac sodium salt (DCF) from soft contact lens (SCL) materials. The coating was hydrophilic, biocompatible, non-toxic, reduced bacterial growth and had minor effects on the physical properties of the material, such as wettability, ionic permeability, refractive index and transmittance, which remained within the recommended values for SCLs. The coating was applied on a silicone-based hydrogel and on commercial SofLens and Purevision SCLs. The coating attenuated the initial drug burst and extended the therapeutic period for, at least, two weeks. Relevantly, the problems of sterilizing drug loaded SCLs coated with biopolymers, using classic methods that involve high temperature or radiation, were successfully solved through high hydrostatic pressure (HHP) sterilization.
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Affiliation(s)
- Diana Silva
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Hermínio C de Sousa
- Univ Coimbra, CIEPQPF, FCTUC, Department of Chemical Engineering, Rua Sílvio Lima, Pólo II - Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Maria Helena Gil
- Univ Coimbra, CIEPQPF, FCTUC, Department of Chemical Engineering, Rua Sílvio Lima, Pólo II - Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Luís F Santos
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Guilhermina Martins Moutinho
- Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Instituto Universitário Egas Moniz, 2829-511 Caparica, Portugal
| | - Madalena Salema-Oom
- Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Instituto Universitário Egas Moniz, 2829-511 Caparica, Portugal
| | - Carmen Alvarez-Lorenzo
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, I+D Farma (GI-1645), Facultad de Farmacia and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Ana Paula Serro
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal; Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Instituto Universitário Egas Moniz, 2829-511 Caparica, Portugal
| | - Benilde Saramago
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
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18
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Qin D, Zhu L, Zhou T, Liao Z, Liang M, Qin L, Cai Z. Tribological behaviour of two kinds of typical hydrogel contact lenses in different lubricants. BIOSURFACE AND BIOTRIBOLOGY 2019. [DOI: 10.1049/bsbt.2019.0029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- Dong Qin
- Ophthalmology DepartmentChengdu Third People's HospitalChengdu610031People's Republic of China
| | - Li‐Ting Zhu
- Tribology Research InstituteKey Laboratory of Advanced Technologies of MaterialsMinistry of EducationSouthwest Jiaotong UniversityChengdu610031People's Republic of China
| | - Teng Zhou
- Tribology Research InstituteKey Laboratory of Advanced Technologies of MaterialsMinistry of EducationSouthwest Jiaotong UniversityChengdu610031People's Republic of China
| | - Zhi‐Qiang Liao
- Ophthalmology DepartmentChengdu Third People's HospitalChengdu610031People's Republic of China
| | - Ming Liang
- Ophthalmology DepartmentChengdu Third People's HospitalChengdu610031People's Republic of China
| | - Ling Qin
- Ophthalmology DepartmentChengdu Third People's HospitalChengdu610031People's Republic of China
| | - Zhen‐Bing Cai
- Tribology Research InstituteKey Laboratory of Advanced Technologies of MaterialsMinistry of EducationSouthwest Jiaotong UniversityChengdu610031People's Republic of China
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19
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Tran NPD, Yang MC. Synthesis and Characterization of Silicone Contact Lenses Based on TRIS-DMA-NVP-HEMA Hydrogels. Polymers (Basel) 2019; 11:polym11060944. [PMID: 31159172 PMCID: PMC6630243 DOI: 10.3390/polym11060944] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 05/25/2019] [Accepted: 05/29/2019] [Indexed: 11/24/2022] Open
Abstract
In this study, silicone-based hydrogel contact lenses were prepared by the polymerization of 3-(methacryloyloxy)propyltris(trimethylsiloxy)silane (TRIS), N,N-dimethylacrylamide (DMA), 1-vinyl-2-pyrrolidinone (NVP), and 2-hydroxyethylmethacrylate (HEMA). The properties of silicone hydrogel lenses were analyzed based on the methods such as equilibrium water content, oxygen permeability, optical transparency, contact angle, mechanical test, protein adsorption, and cell toxicity. The results showed that the TRIS content in all formulations increased the oxygen permeability and decreased the equilibrium water content, while both DMA and NVP contributed the hydrophilicity of the hydrogels. The maximum value of oxygen permeability was 74.9 barrers, corresponding to an equilibrium water content of 44.5% as well as a contact angle of 82°. Moreover, L929 fibroblasts grew on all these hydrogels, suggesting non-cytotoxicity. In general, the silicone hydrogels in this work exhibited good oxygen permeability, stiffness, and optical transparency as well as anti-protein adsorption. Hence, these silicone hydrogel polymers would be feasible for making contact lens.
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Affiliation(s)
- Nguyen-Phuong-Dung Tran
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
| | - Ming-Chien Yang
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
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20
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Synthesis and characterization of soft contact lens based on the combination of silicone nanoparticles with hydrophobic and hydrophilic monomers. JOURNAL OF POLYMER RESEARCH 2019. [DOI: 10.1007/s10965-019-1813-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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21
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Antibacterial layer-by-layer coatings to control drug release from soft contact lenses material. Int J Pharm 2018; 553:186-200. [DOI: 10.1016/j.ijpharm.2018.10.041] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 10/15/2018] [Accepted: 10/16/2018] [Indexed: 11/15/2022]
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22
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Chen K, Fan X, Tang K, Wan G, He X, Li X, Chen Q, Shen M, Lv Y, Wang F. Morphology-Controllable Collagen/Poly(2-hydroxyethyl methacrylate) Porous Hydrogel with a Paraffin Microsphere as a Template. ACS APPLIED BIO MATERIALS 2018; 1:1311-1318. [PMID: 34996235 DOI: 10.1021/acsabm.8b00264] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
In this study, a porous poly(2-hydroxyethyl methacrylate) (PHEMA) matrix was fabricated by a paraffin template method, which was used as a substrate to adhere collagen fibers to form an interconnective porous collagen/PHEMA (Col-PHEMA) composite hydrogel. A microscope and scanning electron microscope (SEM) were employed to characterize the morphology of paraffin microspheres and Col-PHEMA composite hydrogels. The paraffin microspheres with the diameter in the range from 100 to 200 μm were collected by a preset sieve. Then, the interface of uniform paraffin microspheres were thermally bonded to form a contacted template, and the derived Col-PHEMA composite hydrogels had an interconnective porous microstructure. Fourier transform infrared spectroscopy (FTIR) indicated that new hydrogen bonds were formed between collagen fibers and the PHEMA hydrogel. Besides, the Col-PHEMA composite hydrogels revealed a high hydrophilicity, good mechanical properties, and good water uptake capacity. The porous Col-PHEMA composite hydrogels showed a good biocompatibility, and the collagen layer may promote the proliferation of fibroblast cells. The Col-PHEMA composite hydrogel is expected to find an application in corneal repairing.
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Affiliation(s)
- Keke Chen
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Xialian Fan
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Keyong Tang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Guangming Wan
- The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Xichan He
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Xiumin Li
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Qiyuan Chen
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Min Shen
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Yiwen Lv
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Fang Wang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
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23
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Ţălu Ş, Bramowicz M, Kulesza S, Fiorillo I, Giovanzana S. Fractal Features and Surface Micromorphology of Unworn Surfaces of Rigid Gas Permeable Contact Lenses. Curr Eye Res 2017; 42:1118-1123. [PMID: 28443694 DOI: 10.1080/02713683.2017.1293115] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
PURPOSE The aim of this exploratory study was to investigate the micromorphology of surfaces of rigid gas permeable (RGP) contact lenses (CLs) using atomic force microscopy (AFM) followed by fractal analysis. MATERIALS AND METHODS In order to characterize in a quantitative manner the micromorphology of surfaces of new and unworn RGP CLs made of twelve different materials, AFM was taken and then analyzed using fractal methods. Surface topography was sampled in an intermittent-contact mode in air, on square areas of 5 × 5 µm2 (MultiMode with Nanoscope V (Bruker). Spatial characteristics of 3-D surface texture were obtained using parameters defined in ISO 25178-2: 2012 norm. RESULTS The surface texture turned out to have complex 3-D nanoscale geometry. For quantitative characterization of the properties of surface geometry at nanometer level of CL on the global scale, a series of fractal parameters was used. CONCLUSIONS Statistical and fractal parameters of 3-D surfaces can be used by manufacturers to assess the micromorphology of CLs in order to improve their 3-D surface texture characteristics. These parameters can also be used in an elastic-plastic finite element model with contact elements to simulate the friction, wear and micro-elastohydrodynamic lubrication at a nanometer scale between the CL with the corneal surface.
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Affiliation(s)
- Ştefan Ţălu
- a Faculty of Mechanical Engineering, Department of AET, Discipline of Descriptive Geometry and Engineering Graphics , Technical University of Cluj-Napoca , Cluj , Romania
| | - Miroslaw Bramowicz
- b Faculty of Technical Sciences , University of Warmia and Mazury in Olsztyn , Olsztyn , Poland
| | - Slawomir Kulesza
- c Faculty of Mathematics and Computer Science , University of Warmia and Mazury in Olsztyn , Olsztyn , Poland
| | - Ilenia Fiorillo
- d Materials Science Department , University of Milano-Bicocca , Milano , Italy
| | - Stefano Giovanzana
- e Materials Science Department , University of Milano-Bicocca , Milano , Italy
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24
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Seitz ME, Wiseman ME, Hilker I, Loos J, Tian M, Li J, Goswami M, Litvinov VM, Curtin S, Bulters M. Influence of silicone distribution and mobility on the oxygen permeability of model silicone hydrogels. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.04.061] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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25
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Galante R, Ghisleni D, Paradiso P, Alves VD, Pinto TJA, Colaço R, Serro AP. Sterilization of silicone-based hydrogels for biomedical application using ozone gas: Comparison with conventional techniques. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 78:389-397. [PMID: 28575999 DOI: 10.1016/j.msec.2017.04.073] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Accepted: 04/13/2017] [Indexed: 11/28/2022]
Abstract
Sterilization of hydrogels is challenging due to their often reported sensitivity to conventional methods involving heat or radiation. Although aseptic manufacturing is a possibility, terminal sterilization is safer in biological terms, leading to a higher overall efficiency, and thus should be used whenever it is possible. The main goal of this work was to study the applicability of an innovative ozone gas terminal sterilization method for silicone-based hydrogels and compare its efficacy and effects with those of traditional sterilization methods: steam heat and gamma irradiation. Ozone gas sterilization is a method with potential interest since it is reported as a low cost green method, does not leave toxic residues and can be applied to thermosensitive materials. A hydrogel intended for ophthalmological applications, based on tris(trimethylsiloxy)silyl] propyl methacrylate, was prepared and extensively characterized before and after the sterilization procedures. Alterations regarding transparency, swelling, wettability, ionic permeability, friction coefficient, mechanical properties, topography and morphology and chemical composition were monitored. Efficacy of the ozonation was accessed by performing controlled contaminations and sterility tests. In vitro cytotoxicity testes were also performed. The results show that ozonation may be applied to sterilize the studied material. A treatment with 8 pulses allowed sterilizing the material with bioburdens≤103CFU/mL, preserving all the studied properties within the required known values for contact lenses materials. However, a higher exposure (10 pulses) led to some degradation of the material and induced mild cytotoxicity. Steam heat sterilization led to an increase of swelling capacity and a decrease of the water contact angle. Regarding gamma irradiation, the increase of irradiation dose led to an increase of the friction coefficient. The higher dose (25kGy) originated surface degradation and affected the mechanical properties of the hydrogel by inducing a significant increase of the Young's modulus. Overall, the results show that ozonation may be considered as a valid and promising alternative for the sterilization of silicon-based hydrogels for biomedical applications.
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Affiliation(s)
- Raquel Galante
- Departamento de Farmácia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, Avenida Professor Lineu Prestes 580, CEP 05508-00 São Paulo, Brazil; Centro de Química Estrutural (CQE), Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Daniela Ghisleni
- Departamento de Farmácia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, Avenida Professor Lineu Prestes 580, CEP 05508-00 São Paulo, Brazil
| | - Patrizia Paradiso
- Centro de Química Estrutural (CQE), Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Vitor D Alves
- LEAF - Linking Landscape, Environment, Agriculture and Food, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal
| | - Terezinha J A Pinto
- Departamento de Farmácia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, Avenida Professor Lineu Prestes 580, CEP 05508-00 São Paulo, Brazil
| | - Rogério Colaço
- Centro de Química Estrutural (CQE), Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal; Departamento de Engenharia Mecânica and IDMEC - Instituto de Engenharia Mecânica, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Ana Paula Serro
- Centro de Química Estrutural (CQE), Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal; Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Instituto Superior de Ciências da Saúde Egas Moniz, Quinta da Granja, Monte de Caparica, 2829-511 Caparica, Portugal.
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26
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Mignon A, Snoeck D, Dubruel P, Van Vlierberghe S, De Belie N. Crack Mitigation in Concrete: Superabsorbent Polymers as Key to Success? MATERIALS (BASEL, SWITZERLAND) 2017; 10:E237. [PMID: 28772599 PMCID: PMC5503349 DOI: 10.3390/ma10030237] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 02/07/2017] [Accepted: 02/20/2017] [Indexed: 11/16/2022]
Abstract
Cracking is a major concern in building applications. Cracks may arise from shrinkage, freeze/thawing and/or structural stresses, amongst others. Several solutions can be found but superabsorbent polymers (SAPs) seem to be interesting to counteract these problems. At an early age, the absorbed water by the SAPs may be used to mitigate autogenous and plastic shrinkage. The formed macro pores may increase the freeze/thaw resistance. The swelling upon water ingress may seal a crack from intruding fluids and may regain the overall water-tightness. The latter water may promote autogenous healing. The use of superabsorbent polymers is thus very interesting. This review paper summarizes the current research and gives a critical note towards the use of superabsorbent polymers in cementitious materials.
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Affiliation(s)
- Arn Mignon
- Magnel Laboratory for Concrete Research, Department of Structural Engineering, Faculty of Engineering and Architecture, Ghent University, Technologiepark Zwijnaarde 904, B-9052 Ghent, Belgium.
- Polymer Chemistry and Biomaterials Group, Department of Macromolecular and Organic Chemistry, Faculty of Sciences, Ghent University, Krijgslaan 281, B-9000 Ghent, Belgium.
| | - Didier Snoeck
- Magnel Laboratory for Concrete Research, Department of Structural Engineering, Faculty of Engineering and Architecture, Ghent University, Technologiepark Zwijnaarde 904, B-9052 Ghent, Belgium.
| | - Peter Dubruel
- Polymer Chemistry and Biomaterials Group, Department of Macromolecular and Organic Chemistry, Faculty of Sciences, Ghent University, Krijgslaan 281, B-9000 Ghent, Belgium.
| | - Sandra Van Vlierberghe
- Polymer Chemistry and Biomaterials Group, Department of Macromolecular and Organic Chemistry, Faculty of Sciences, Ghent University, Krijgslaan 281, B-9000 Ghent, Belgium.
| | - Nele De Belie
- Magnel Laboratory for Concrete Research, Department of Structural Engineering, Faculty of Engineering and Architecture, Ghent University, Technologiepark Zwijnaarde 904, B-9052 Ghent, Belgium.
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Abstract
OBJECTIVE To review the effect of contact lens (CL) material, design, and fitting characteristics on CL discomfort. METHODS A PubMed search identified publications describing subjective comfort and CL material, fitting, and design parameters. The review included clinical signs associated with discomfort that may be a consequence of these parameters. RESULTS Reduced lens movement or more CL tightness were associated with improved comfort. Increased lens-induced paralimbal conjunctival staining and indentation, considered as quasi-indicators of CL fitting or edge design, were also associated with better comfort. No recent studies have evaluated varying CL design parameters and subjective comfort. Silicone hydrogel CLs are no different in comfort compared with hydrogel CLs. Lower equilibrium water content is associated with improved comfort in hydrogel CL wear. Coefficient of friction shows promise as a material factor potentially associated with comfort. Lid wiper epitheliopathy and lid-parallel conjunctival folds have been linked with comfort in established wearers. CONCLUSIONS Recent studies have confirmed the association between more mobile CLs and more discomfort, whereas closer conformity of the CL to the bulbar conjunctiva improved subjective comfort. There is no evidence to support the perceived comfort difference between silicone hydrogel and hydrogel CL. There has been limited progress in understanding the impact of varying specific CL design parameters. Although specific clinical signs may be predictive of discomfort, their role in the natural history of discomfort remains unclear. A better understanding of the relationship between coefficient of friction and comfort and strategies to improve lubricity may hold promise for limiting CL discomfort.
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Yu Z, Zhang Y, Gao ZJ, Ren XY, Gao GH. Enhancing mechanical strength of hydrogels via IPN structure. J Appl Polym Sci 2016. [DOI: 10.1002/app.44503] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Zhe Yu
- School of Chemical Engineering; Advanced Institute of Materials Science, Changchun University of Technology; Changchun People's Republic of China
| | - Ying Zhang
- School of Chemical Engineering; Advanced Institute of Materials Science, Changchun University of Technology; Changchun People's Republic of China
| | - Zi Jian Gao
- School of Chemical Engineering; Advanced Institute of Materials Science, Changchun University of Technology; Changchun People's Republic of China
| | - Xiu Yan Ren
- School of Chemical Engineering; Advanced Institute of Materials Science, Changchun University of Technology; Changchun People's Republic of China
| | - Guang Hui Gao
- School of Chemical Engineering; Advanced Institute of Materials Science, Changchun University of Technology; Changchun People's Republic of China
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Silva D, Pinto LFV, Bozukova D, Santos LF, Serro AP, Saramago B. Chitosan/alginate based multilayers to control drug release from ophthalmic lens. Colloids Surf B Biointerfaces 2016; 147:81-89. [PMID: 27494772 DOI: 10.1016/j.colsurfb.2016.07.047] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Revised: 07/15/2016] [Accepted: 07/21/2016] [Indexed: 01/27/2023]
Abstract
In this study we investigated the possibility of using layer-by-layer deposition, based in natural polymers (chitosan and alginate), to control the release of different ophthalmic drugs from three types of lens materials: a silicone-based hydrogel recently proposed by our group as drug releasing soft contact lens (SCL) material and two commercially available materials: CI26Y for intraocular lens (IOLs) and Definitive 50 for SCLs. The optimised coating, consisting in one double layer of (alginate - CaCl2)/(chitosan+glyoxal) topped with a final alginate-CaCl2 layer to avoid chitosan degradation by tear fluid proteins, proved to have excellent features to control the release of the anti-inflammatory, diclofenac, while keeping or improving the physical properties of the lenses. The coating leads to a controlled release of diclofenac from SCL and IOL materials for, at least, one week. Due to its high hydrophilicity (water contact angle≈0) and biocompatibility, it should avoid the use of further surface treatments to enhance the useŕs comfort. However, the barrier effect of this coating is specific for diclofenac, giving evidence to the need of optimizing the chemical composition of the layers in view of the desired drug.
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Affiliation(s)
- Diana Silva
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Luís F V Pinto
- Altakitin S.A., Rua José Gomes Ferreira, Arm. D, 2660-360 São Julião do Tojal, Lisboa, Portugal; CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Campus da Caparica, 2829-516 Caparica, Portugal
| | - Dimitriya Bozukova
- PhysIOL sa/nv, Liège Science Park, Allée des Noisetiers 4, 4031 Liège, Belgium
| | - Luís F Santos
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Ana Paula Serro
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal; CIIEM, Instituto Superior de Ciências da Saúde Egas Moniz, Campus Universitário, Quinta da Granja, Monte de Caparica, 2829-511 Caparica, Portugal
| | - Benilde Saramago
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
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Dai H, Huang H. Modified pineapple peel cellulose hydrogels embedded with sepia ink for effective removal of methylene blue. Carbohydr Polym 2016; 148:1-10. [PMID: 27185109 DOI: 10.1016/j.carbpol.2016.04.040] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Revised: 03/15/2016] [Accepted: 04/09/2016] [Indexed: 01/03/2023]
Abstract
Novel composite hydrogels based on pineapple peel cellulose and sepia ink were synthesized by homogeneous acetylation of cellulose in ionic liquid 1-butyl-3-methylimidazolium chloride. The structure and morphology of the prepared hydrogels were characterized by Fourier transform infrared spectroscopy, field emission scanning electron microscope, X-ray diffraction, thermogravimetry and differential scanning calorimetry. The effects of acetylation time, acetylation temperature, molar ratio of acetic anhydride/anhydroglucose unit and the additive amount of sepia ink on methylene blue adsorption capacity of the hydrogels embedded with sepia ink were also investigated. Methylene blue adsorption of the hydrogels followed pseudo-second-order kinetic model and sepia ink improved adsorption capacity significantly. The adsorption capacity at equilibrium was increased from 53.72 to 138.25mg/g when the additive amount of sepia ink of the hydrogels was 10%.
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Affiliation(s)
- Hongjie Dai
- Department of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China
| | - Huihua Huang
- Department of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China.
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