1
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Li L, Yue T, Feng J, Zhang Y, Hou J, Wang Y. Recent progress in lactate oxidase-based drug delivery systems for enhanced cancer therapy. NANOSCALE 2024; 16:8739-8758. [PMID: 38602362 DOI: 10.1039/d3nr05952a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2024]
Abstract
Lactate oxidase (LOX) is a natural enzyme that efficiently consumes lactate. In the presence of oxygen, LOX can catalyse the formation of pyruvate and hydrogen peroxide (H2O2) from lactate. This process led to acidity alleviation, hypoxia, and a further increase in oxidative stress, alleviating the immunosuppressive state of the tumour microenvironment (TME). However, the high cost of LOX preparation and purification, poor stability, and systemic toxicity limited its application in tumour therapy. Therefore, the rational application of drug delivery systems can protect LOX from the organism's environment and maintain its catalytic activity. This paper reviews various LOX-based drug-carrying systems, including inorganic nanocarriers, organic nanocarriers, and inorganic-organic hybrid nanocarriers, as well as other non-nanocarriers, which have been used for tumour therapy in recent years. In addition, this area's challenges and potential for the future are highlighted.
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Affiliation(s)
- Lu Li
- School of Life Science and Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China.
| | - Tian Yue
- School of Life Science and Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China.
| | - Jie Feng
- College of Medicine, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
| | - Yujun Zhang
- School of Life Science and Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China.
| | - Jun Hou
- School of Life Science and Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China.
| | - Yi Wang
- School of Life Science and Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China.
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2
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Hao G, Qi Z, Li L, Xu ZP. Investigation of the mucin-nanoparticle interactions via real-time monitoring by microbalance and kinetic model simulation. J Colloid Interface Sci 2024; 661:588-597. [PMID: 38308897 DOI: 10.1016/j.jcis.2024.01.077] [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: 12/15/2023] [Accepted: 01/11/2024] [Indexed: 02/05/2024]
Abstract
Interactions between nanoparticles and the mucus layer are crucial to understand the behaviours in biological environments and design drug delivery systems. In this study, we developed a kinetic deposition model for the dynamic mucin-nanoparticle interactions using quartz crystal microbalance with dissipation (QCM-D). We investigated the effects of the physiochemical properties of several nanoparticles (including size, charge, and shape) and the physiological conditions on the mucin-nanoparticle interaction. Interestingly, layered double hydroxide (LDH) nanoparticles showed stronger interactions with the mucus layer compared to other types of nanoparticles due to their unique plate-like morphology. In specific for sheet-like LDH nanoparticles, our model found that their equilibrium adsorption capacity (Qe) followed the Langmuir adsorption isotherm, and the adsorption rate (k1) increased proportionally with the nanoparticle concentration. In addition, the particle size and thickness affected Qe and the surface coverage. Furthermore, bovine serum albumin (BSA) coating dramatically increased k1 of LDH nanoparticles. We proposed a novel mechanism to elucidate mucin-nanoparticle interactions, shedding light on the synergistic roles of drag force (Fd), repulsive force (Fr), and adsorptive force (Fa). These findings offer valuable insights into the complex mucin-nanoparticle interactions and provide guidance for the design of drug delivery systems.
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Affiliation(s)
- Guanyu Hao
- Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Zhi Qi
- Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Li Li
- Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, Queensland 4072, Australia.
| | - Zhi Ping Xu
- Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, Queensland 4072, Australia.
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3
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Kumari S, Sharma V, Soni S, Sharma A, Thakur A, Kumar S, Dhama K, Sharma AK, Bhatia SK. Layered double hydroxides and their tailored hybrids/composites: Progressive trends for delivery of natural/synthetic-drug/cosmetic biomolecules. ENVIRONMENTAL RESEARCH 2023; 238:117171. [PMID: 37734578 DOI: 10.1016/j.envres.2023.117171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 08/31/2023] [Accepted: 09/15/2023] [Indexed: 09/23/2023]
Abstract
Layered double hydroxides (LDHs) are well-known and important class of hydrotalcite-type anionic clays (HTs) materials that are cost-effective with additional advantages of facile synthesis, composition, tenability, and reusability. These convincing characteristics are liable for their applications in various fields related to energy, environment, catalysis, biomedical, and biotechnology. HTs/LDHs are generally synthesized from low cost abundantly available chemical precursors through the aqueous synthetic pathways under mild reaction conditions. These materials can be termed green materials based on their non-toxic nature, availability of precursors, facile and low-cost production using aqueous medium conditions with less hazardous effluents. Diverse and fascinating characteristics have been attributed to HTs/LDHs like anion exchange ability, surface basicity, biocompatibility, controlled release of the anion specific area, porosity, easy surface modification, and pH dependent biodegradability. Hence, HTs/LDHs and their modified and/or functionalized nanohybrids/nanocomposites are reported as the potential drug delivery carriers with a capability to stabilize the susceptible bioactive molecules, may enhance the solubility of poorly soluble drugs along with controlled drug/bioactive molecule release and delivery. These clay and bioactive hybrid materials have good biocompatibility, less cytotoxicity, and better site-targeting with improved cellular uptake than that of free parent biomolecules. These lamellar solids of micro/nanostructure are compatible, host-guest materials and able to fabricate with drugs/cosmeceutical/bio- or synthetic polymers without any change in their molecular structure and reactivity along with improvement in their stabilities. Other important features are facile synthesis, basicity, high stability with easy storage, and efficient administration with low bio-toxicity. This study enlightens the applications of HTs/LDHs along with their hybrids/composites in the field of drug/cosmeceutical/gene delivery systems of natural/synthetic biomolecules.
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Affiliation(s)
- Sonika Kumari
- Department of Chemistry, Career Point University, Tikker - Kharwarian, Hamirpur, Himachal Pradesh, 176041, India; Center for Nanoscience and Technology, Career Point University, Tikker - Kharwarian, Hamirpur, Himachal Pradesh, 176041, India
| | - Varruchi Sharma
- Department of Biotechnology & Bioinformatics, Sri Guru Gobind Singh College, Chandigarh, 160019, India
| | - Savita Soni
- Department of Chemistry, Career Point University, Tikker - Kharwarian, Hamirpur, Himachal Pradesh, 176041, India; Center for Nanoscience and Technology, Career Point University, Tikker - Kharwarian, Hamirpur, Himachal Pradesh, 176041, India
| | - Ajay Sharma
- Department of Chemistry, Career Point University, Tikker - Kharwarian, Hamirpur, Himachal Pradesh, 176041, India; Center for Nanoscience and Technology, Career Point University, Tikker - Kharwarian, Hamirpur, Himachal Pradesh, 176041, India.
| | - Abhinay Thakur
- Department of Zoology, DAV College, Jalandhar, Punjab, 144008, India
| | - Satish Kumar
- Department of Food Science and Technology, Dr. YS Parmar University of Horticulture and Forestry, Nauni, Solan, Himachal Pradesh, 173230, India
| | - Kuldeep Dhama
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar, 243122, Uttar Pradesh, India
| | - Anil Kumar Sharma
- Department of Biotechnology, Amity University, Sector 82 A, IT City Rd, Block D, Sahibzada Ajit Singh Nagar, Punjab, 140306, India.
| | - Shashi Kant Bhatia
- Institute for Ubiquitous Information Technology and Applications, Konkuk University, Hwayang-dong Gwangjin-gu, Seoul, 05029, South Korea; Department of Biological Engineering, College of Engineering, Konkuk University, Hwayang-dong Gwangjin-gu, Seoul, 05029, South Korea.
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4
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Fan J, Zhao Y, Wang Q, Gao M, Li X, Li D, Feng J. Process coupling of CO 2 reduction and 5-HMF oxidation mediated by defect-enriched layered double hydroxides. Dalton Trans 2023; 52:1950-1961. [PMID: 36683445 DOI: 10.1039/d2dt03886b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Aiming at the comprehensive utilization of waste carbon resources and renewable carbon resources, we put forward the photocatalytic coupling process of CO2 reduction and 5-hydroxymethylfurfural (5-HMF) oxidation mediated by the anionic compound of layered double hydroxides (LDHs). Specifically, a ZnNiFe-LDH was synthesized by co-precipitation method, during which CO2 was stored between LDH layers in the form of carbonate. Then, a certain amount of metal vacancies were introduced into LDH nanosheets by selectively etching Zn2+ ions. ICP-AES, EPR and XPS showed that the concentration of Zn vacancies gradually increased with the etching time prolonging, which thus optimized the electronic structure of LDH layers. Under the catalysis of the electron-rich metal cations and hydroxyl groups on the layers, the interlayer carbonate was in situ reduced into CO coupled accompanied with the 5-HMF oxidation to 2.5-furandiformaldehyde (DFF). Compared with the unetched ZnNiFe-LDHs, the CO and DFF yields over the LDHs etched for 3 h were increased by 2.84 and 2.82 times under UV-vis irradiation with a density of 500 mW cm-2. Finally, combined with isotope-labeled 13CO2 experiments and in situ FTIR characterization, we revealed the possible coupling mechanism and defect-induced performance enhancement mechanism.
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Affiliation(s)
- Jingjing Fan
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Box 98, 15 Bei San Huan East Road, 100029, Beijing, China.
| | - Yin Zhao
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Box 98, 15 Bei San Huan East Road, 100029, Beijing, China.
| | - Qian Wang
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Box 98, 15 Bei San Huan East Road, 100029, Beijing, China.
| | - Mingyu Gao
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Box 98, 15 Bei San Huan East Road, 100029, Beijing, China.
| | - Xintao Li
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Box 98, 15 Bei San Huan East Road, 100029, Beijing, China.
| | - Dianqing Li
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Box 98, 15 Bei San Huan East Road, 100029, Beijing, China. .,Beijing Engineering Center for Hierarchical Catalysts, Beijing University of Chemical Technology, 100029, Beijing, China
| | - Junting Feng
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Box 98, 15 Bei San Huan East Road, 100029, Beijing, China. .,Beijing Engineering Center for Hierarchical Catalysts, Beijing University of Chemical Technology, 100029, Beijing, China
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5
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Surface modification of two-dimensional layered double hydroxide nanoparticles with biopolymers for biomedical applications. Adv Drug Deliv Rev 2022; 191:114590. [PMID: 36341860 DOI: 10.1016/j.addr.2022.114590] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 05/24/2022] [Accepted: 10/25/2022] [Indexed: 01/24/2023]
Abstract
Layered double hydroxides (LDHs) are appealing nanomaterials for (bio)medical applications and their potential is threefold. One can gain advantage of the structure of LDH frame (i.e., layered morphology), anion exchanging property towards drugs with acidic character and tendency for facile surface modification with biopolymers. This review focuses on the third aspect, as it is necessary to evaluate the advantages of polymer adsorption on LDH surfaces. Beside the short discussion on fundamental and structural features of LDHs, LDH-biopolymer interactions will be classified in terms of the effect on the colloidal stability of the dispersions. Thereafter, an overview on the biocompatibility and biomedical applications of LDH-biopolymer composite materials will be given. Finally, the advances made in the field will be summarized and future research directions will be suggested.
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6
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Zhu Y, Li S, Li J, Falcone N, Cui Q, Shah S, Hartel MC, Yu N, Young P, de Barros NR, Wu Z, Haghniaz R, Ermis M, Wang C, Kang H, Lee J, Karamikamkar S, Ahadian S, Jucaud V, Dokmeci MR, Kim HJ, Khademhosseini A. Lab-on-a-Contact Lens: Recent Advances and Future Opportunities in Diagnostics and Therapeutics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2108389. [PMID: 35130584 PMCID: PMC9233032 DOI: 10.1002/adma.202108389] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 01/27/2022] [Indexed: 05/09/2023]
Abstract
The eye is one of the most complex organs in the human body, containing rich and critical physiological information (e.g., intraocular pressure, corneal temperature, and pH) as well as a library of metabolite biomarkers (e.g., glucose, proteins, and specific ions). Smart contact lenses (SCLs) can serve as a wearable intelligent ocular prosthetic device capable of noninvasive and continuous monitoring of various essential physical/biochemical parameters and drug loading/delivery for the treatment of ocular diseases. Advances in SCL technologies and the growing public interest in personalized health are accelerating SCL research more than ever before. Here, the current status and potential of SCL development through a comprehensive review from fabrication to applications to commercialization are discussed. First, the material, fabrication, and platform designs of the SCLs for the diagnostic and therapeutic applications are discussed. Then, the latest advances in diagnostic and therapeutic SCLs for clinical translation are reviewed. Later, the established techniques for wearable power transfer and wireless data transmission applied to current SCL devices are summarized. An outlook, future opportunities, and challenges for developing next-generation SCL devices are also provided. With the rise in interest of SCL development, this comprehensive and essential review can serve as a new paradigm for the SCL devices.
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Affiliation(s)
- Yangzhi Zhu
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | - Shaopei Li
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | - Jinghang Li
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
- School of Engineering, Westlake University, Hangzhou, Zhejiang Province, 310024, China
- School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, Hubei Province, 430205, China
| | - Natashya Falcone
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | - Qingyu Cui
- Department of Medicine, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, CA, 90095, USA
| | - Shilp Shah
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
- Department of Bioengineering, University of California-Los Angeles, Los Angeles, CA, 90095, USA
| | - Martin C Hartel
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
- Department of Bioengineering, University of California-Los Angeles, Los Angeles, CA, 90095, USA
| | - Ning Yu
- Department of Chemical and Environmental Engineering, University of California-Riverside, Riverside, CA, 92521, USA
| | - Patric Young
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | | | - Zhuohong Wu
- Department of Nanoengineering, University of California-San Diego, San Diego, CA, 92093, USA
| | - Reihaneh Haghniaz
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | - Menekse Ermis
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | - Canran Wang
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Heemin Kang
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Junmin Lee
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | | | - Samad Ahadian
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | - Vadim Jucaud
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | - Mehmet R Dokmeci
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | - Han-Jun Kim
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | - Ali Khademhosseini
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
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7
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Leandro SR, Marques IJ, Torres RS, Fernandes TA, Vaz PD, Nunes CD. Nitroarene and dye reduction with 2:1 Co/Al layered double hydroxide catalysts – Is gold still necessary? Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2021.120336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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8
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Zhao Q, Wang Y, Zhang W, Wang Y, Wang S. Succinylated casein functionalized mesoporous silica nanoplatforms to overcome multiple gastrointestinal barriers. J Drug Deliv Sci Technol 2020. [DOI: 10.1016/j.jddst.2020.102068] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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9
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Choi G, Choy JH. Recent progress in layered double hydroxides as a cancer theranostic nanoplatform. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2020; 13:e1679. [PMID: 33140557 DOI: 10.1002/wnan.1679] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 10/06/2020] [Accepted: 10/09/2020] [Indexed: 12/24/2022]
Abstract
Layered double hydroxide (LDH) has been a big challenge in exploring new hybrid materials by intercalating inorganic, organic, or bio molecules into their lamellar lattice, those which often showed dual functions from each other or new mutative properties. Recently, nano-bio convergence technology becomes one of the most extensively studied research fields in the view point of developing advanced drugs and diagnostic agents to fight against disease and eventually to improve the lives of human beings. Therefore, LDH as one of the nanomaterials have been intensively investigated not only as biocompatible drug delivery vehicle for cancer chemotherapy but also as diagnostic and imaging agents. In the present review, we have attempted to summarize theranostic functions of drug-LDH hybrid nanoparticles including their synthetic methods, physico-chemical and biological properties, and their unique mechanism overcoming drug resistance, and targeting properties based on in vitro and finally in vivo results. This article is categorized under: Diagnostic Tools > Diagnostic Nanodevices Diagnostic Tools > in vivo Nanodiagnostics and Imaging.
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Affiliation(s)
- Goeun Choi
- Intelligent Nanohybrid Materials Laboratory (INML), Institute of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan, Republic of Korea.,College of Science and Technology, Dankook University, Cheonan, Republic of Korea
| | - Jin-Ho Choy
- Intelligent Nanohybrid Materials Laboratory (INML), Institute of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan, Republic of Korea.,Tokyo Tech World Research Hub Initiative (WRHI), Institute of Innovative Research, Tokyo Institute of Technology, Yokohama, Japan
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10
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Somosi Z, Pavlovic M, Pálinkó I, Szilágyi I. Effect of Polyelectrolyte Mono- and Bilayer Formation on the Colloidal Stability of Layered Double Hydroxide Nanoparticles. NANOMATERIALS (BASEL, SWITZERLAND) 2018; 8:E986. [PMID: 30487401 PMCID: PMC6316193 DOI: 10.3390/nano8120986] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 11/14/2018] [Accepted: 11/26/2018] [Indexed: 12/30/2022]
Abstract
Sequential adsorption of polyelectrolytes on nanoparticles is a popular method to obtain thin films after deposition. However, the effect of polyelectrolyte multilayer formation on the colloidal stability of the nanoparticles has not been studied in detail. In the present work, layered double hydroxides (LDH) were synthesized and interaction with oppositely and like-charged polyelectrolytes was investigated. Electrophoretic and light scattering measurements revealed that colloidal stability of LDH can be tuned by adsorption of poly(styrene sulfonate) (PSS) on the oppositely charged LDH surface in appropriate doses and thus, unstable or stable dispersions can be designed. Negatively charged LDH of adsorbed PSS monolayer was obtained and a poly(diallyldimethyl ammonium chloride) (PDADMAC) second layer was systematically built on the particles. The obtained polyelectrolyte bilayer provided high colloidal stability for the LDH-PSS-PDADMAC dispersions due to the presence of repulsive interparticle forces of electrostatic and steric origin. The results provide crucial quantitative information on designing highly stable particle-polyelectrolyte systems for the preparation of thin films or immobilization of guest substances between the layers for delivery processes.
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Affiliation(s)
- Zoltán Somosi
- MTA-SZTE Lendület Biocolloids Research Group, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
- Interdisciplinary Excellence Centre, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
| | - Marko Pavlovic
- MTA-SZTE Lendület Biocolloids Research Group, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
| | - István Pálinkó
- Material and Solution Structure Research Group, Department of Organic Chemistry, University of Szeged, H-6720 Szeged, Hungary.
| | - István Szilágyi
- MTA-SZTE Lendület Biocolloids Research Group, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
- Interdisciplinary Excellence Centre, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
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11
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Li L, Zhang R, Gu W, Xu ZP. Mannose-conjugated layered double hydroxide nanocomposite for targeted siRNA delivery to enhance cancer therapy. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2018. [DOI: 10.1016/j.nano.2017.06.006] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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12
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Bani Hashemi A, Kasiri G, Glenneberg J, Langer F, Kun R, La Mantia F. Electrochemical and Morphological Characterization of Zn−Al−Cu Layered Double Hydroxides as a Negative Electrode in Aqueous Zinc-Ion Batteries. ChemElectroChem 2018. [DOI: 10.1002/celc.201800291] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- A. Bani Hashemi
- Universität Bremen; Energiespeicher- und Energiewandlersysteme; Bibliothekstraße 1 28359 Bremen Germany
| | - G. Kasiri
- Universität Bremen; Energiespeicher- und Energiewandlersysteme; Bibliothekstraße 1 28359 Bremen Germany
| | - J. Glenneberg
- University of Bremen; Faculty of Production Engineering Innovative Sensor and Functional Materials Research Group; Badgasteiner Str. 1 28359 Bremen Germany
| | - F. Langer
- University of Bremen; Faculty of Production Engineering Innovative Sensor and Functional Materials Research Group; Badgasteiner Str. 1 28359 Bremen Germany
| | - R. Kun
- University of Bremen; Faculty of Production Engineering Innovative Sensor and Functional Materials Research Group; Badgasteiner Str. 1 28359 Bremen Germany
- Fraunhofer Institute for Manufacturing Technology and Advanced; Materials - IFAM; Wiener Str. 12 28359 Bremen Germany
| | - F. La Mantia
- Universität Bremen; Energiespeicher- und Energiewandlersysteme; Bibliothekstraße 1 28359 Bremen Germany
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13
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Pavlovic M, Rouster P, Somosi Z, Szilagyi I. Horseradish peroxidase-nanoclay hybrid particles of high functional and colloidal stability. J Colloid Interface Sci 2018; 524:114-121. [PMID: 29635084 DOI: 10.1016/j.jcis.2018.04.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 03/29/2018] [Accepted: 04/02/2018] [Indexed: 02/07/2023]
Abstract
Highly stable dispersions of enzyme-clay nanohybrids of excellent horseradish peroxidase activity were developed. Layered double hydroxide nanoclay was synthesized and functionalized with heparin polyelectrolyte to immobilize the horseradish peroxidase enzyme. The formation of a saturated heparin layer on the platelets led to charge inversion of the positively charged bare nanoclay and to highly stable aqueous dispersions. Great affinity of the enzyme to the surface modified platelets resulted in strong horseradish peroxidase adsorption through electrostatic and hydrophobic interactions as well as hydrogen bonding network and prevented enzyme leakage from the obtained material. The enzyme kept its functional integrity upon immobilization and showed excellent activity in decomposition of hydrogen peroxide and oxidation of an aromatic compound in the test reactions. In addition, remarkable long term functional stability of the enzyme-nanoclay hybrid was observed making the developed colloidal system a promising antioxidant candidate in biomedical treatments and industrial processes.
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Affiliation(s)
- Marko Pavlovic
- Department of Inorganic and Analytical Chemistry, University of Geneva, CH-1205 Geneva, Switzerland
| | - Paul Rouster
- Institute of Condensed Matter and Nanosciences - Bio and Soft Matter, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
| | - Zoltan Somosi
- MTA-SZTE Lendület Biocolloids Research Group, University of Szeged, H-6720 Szeged, Hungary
| | - Istvan Szilagyi
- MTA-SZTE Lendület Biocolloids Research Group, University of Szeged, H-6720 Szeged, Hungary; Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
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14
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Gerold CT, Bakker E, Henry CS. Selective Distance-Based K+ Quantification on Paper-Based Microfluidics. Anal Chem 2018; 90:4894-4900. [DOI: 10.1021/acs.analchem.8b00559] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Chase T. Gerold
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80521, United States
- Department of Inorganic and Analytical Chemistry, The University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland
| | - Eric Bakker
- Department of Inorganic and Analytical Chemistry, The University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland
| | - Charles S. Henry
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80521, United States
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15
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Choi G, Eom S, Vinu A, Choy JH. 2D Nanostructured Metal Hydroxides with Gene Delivery and Theranostic Functions; A Comprehensive Review. CHEM REC 2018; 18:1033-1053. [DOI: 10.1002/tcr.201700091] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 01/26/2018] [Indexed: 01/18/2023]
Affiliation(s)
- Goeun Choi
- Center for Intelligent Nano-Bio Materials (CINBM) Department of Chemistry and Nano Science; Ewha Womans University; Seoul 03760 Republic of Korea
| | - Sairan Eom
- Center for Intelligent Nano-Bio Materials (CINBM) Department of Chemistry and Nano Science; Ewha Womans University; Seoul 03760 Republic of Korea
| | - Ajayan Vinu
- Global Innovative Center for Advanced Nanomaterials Faculty of Engineering and Natural Built Environment The University of Newcastle; University Drive; Callaghan NSW 2308 Australia
| | - Jin-Ho Choy
- Center for Intelligent Nano-Bio Materials (CINBM) Department of Chemistry and Nano Science; Ewha Womans University; Seoul 03760 Republic of Korea
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16
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Pattammattel A, Pande P, Kuttappan D, Basil AK, Amalaradjou MA, Kumar CV. Controlling the Graphene-Bio Interface: Dispersions in Animal Sera for Enhanced Stability and Reduced Toxicity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:14184-14194. [PMID: 29144756 PMCID: PMC5911160 DOI: 10.1021/acs.langmuir.7b02854] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Liquid phase exfoliation of graphite in six different animal sera and evaluation of its toxicity are reported here. Previously, we reported the exfoliation of graphene using proteins, and here we extend this approach to complex animal fluids. A kitchen blender with a high-turbulence flow gave high quality and maximum exfoliation efficiency in all sera tested, when compared to the values found with shear and ultrasonication methods. Raman spectra and electron microscopy confirmed the formation of three- or four-layer, submicrometer size graphene, independent of the serum used. Graphene prepared in serum was directly transferred to cell culture media without post-treatments. Contrary to many reports, a nanotoxicity study of this graphene fully dispersed to human embryonic kidney cells, human lung cancer cells, and nematodes (Caenorhabditis elegans) showed no acute toxicity for up to 7 days at various doses (50-500 μg/mL), but prolonged exposure at higher doses (300-500 μg/mL, 10-15 days) showed cytotoxicity to cells (∼95% death) and reproductive toxicity to C. elegans (5-10% reduction in brood size). The origin of toxicity was found to be due to the highly fragmented smaller graphene sheets (<200 nm), while the larger sheets were nontoxic (50-300 μg/mL dose). In contrast, graphene produced with sodium cholate as the mediator has been found to be cytotoxic to these cells at these dosages. We demonstrated the toxicity of liquid phase exfoliated graphene is attributed to highly fragmented fractions or nonbiocompatible exfoliating agents. Thus, low-toxicity graphene/serum suspensions are produced by a facile method in biological media, and this approach may accelerate the much-anticipated development of graphene for biological applications.
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Affiliation(s)
- Ajith Pattammattel
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Unit 3060, Storrs, CT 06269-3060, USA
| | - Paritosh Pande
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Unit 3060, Storrs, CT 06269-3060, USA
| | - Deepa Kuttappan
- Department of Animal Science, University of Connecticut, Storrs, CT 06269, USA
| | - Ashis K. Basil
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Unit 3060, Storrs, CT 06269-3060, USA
| | | | - Challa V. Kumar
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Unit 3060, Storrs, CT 06269-3060, USA
- The Institute of Material Science University of Connecticut, Storrs, CT 06269, USA
- Department of Molecular and Cell Biology, University of Connecticut, Storrs, CT 06269
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17
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Wang Y, Cui Y, Zhao Y, Zhao Q, He B, Zhang Q, Wang S. Effects of surface modification and size on oral drug delivery of mesoporous silica formulation. J Colloid Interface Sci 2017; 513:736-747. [PMID: 29220688 DOI: 10.1016/j.jcis.2017.11.065] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Revised: 11/21/2017] [Accepted: 11/21/2017] [Indexed: 12/29/2022]
Abstract
The surface chemistry and size of nanoparticles can greatly impact their interaction with biological pathways and alter efficacy. However, the interplay between surface modification and particle size has not been well investigated especially for oral delivery. It is necessary to maximize the bioavailability of loading therapeutics. Here, we prepared different sized mesoporous silica nanoparticles (100-500 nm) and conjugated them with polyethylenimine-coated carbondots (PCD) for effective transepithelial absorption. The nanoparticles were also coated with polyethylene glycol (PEG) polymers for improved mucus permeability. These mesoporous silica nanoparticles conjugated to PCD and coated in PEG (MSN@PCD@PEG) were used to study the influence of particle size and surface chemistry on transepithelial transport and bioavailability. Results demonstrated that the MSN@PCD@PEG with a diameter 250 nm had the highest transepithelial transport and oral bioavailability compared to other formulations. Drug release, endocytosis pathways, transepithelial transport and degradation of these different nanocarriers were systematically studied in order to investigate effects of size variety. The findings indicated that nanoparticle-based oral drug delivery can be potentially improved by adjusting physicochemical properties. We believe that understanding the importance of surface chemistry and particle size in the oral delivery will improve nanoparticle engineering and oral application.
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Affiliation(s)
- Ying Wang
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning Province 110016, PR China
| | - Yu Cui
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning Province 110016, PR China
| | - Yating Zhao
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning Province 110016, PR China
| | - Qinfu Zhao
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning Province 110016, PR China
| | - Bing He
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, PR China
| | - Qiang Zhang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, PR China
| | - Siling Wang
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning Province 110016, PR China.
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18
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Delaminating and restacking MgAl-layered double hydroxide monitored and characterized by a range of instrumental methods. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.10.056] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Zuo H, Chen W, Cooper HM, Xu ZP. A Facile Way of Modifying Layered Double Hydroxide Nanoparticles with Targeting Ligand-Conjugated Albumin for Enhanced Delivery to Brain Tumour Cells. ACS APPLIED MATERIALS & INTERFACES 2017; 9:20444-20453. [PMID: 28574700 DOI: 10.1021/acsami.7b06421] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Active targeting of nanoparticles (NPs) for cancer treatment has attracted increasing interest in the past decades. Various ligand modification strategies have been used to enhance the targeting of NPs to the tumor site. However, how to reproducibly fabricate diverse targeting NPs with narrowly changeable biophysiochemical properties remains as a major challenge. In this study, layered double hydroxide (LDH) NPs were modified as a target delivery system. Two brain tumor targeting ligands, i.e., angiopep-2 and rabies virus glycoprotein, were conjugated to the LDH NPs via an intermatrix protein moiety, bovine serum albumin (BSA), simultaneously endowing the LDHs with excellent colloidal stability and targeting capability. The ligands were first covalently linked with BSA through the heterobifunctional cross-linker sulfosuccinimidyl 4-(N-maleimidomethyl)cyclohexane-1-carboxylate. Then, the ligand-linked BSA and pristine BSA were together coated onto the surface of LDHs through electrostatic interaction, followed by cross-linking with the cross-linker glutaraldehyde to immobilize these BSAs on the LDH surface. In this way, we are able to readily prepare colloidally stabilized tumor-targeted LDH NPs. The targeting efficacy of the ligand-conjugated LDH delivery system has been evidenced in the uptake by two neutral cells (U87 and N2a) compared to unmodified LDHs. This new approach provides a promising strategy for rational design and preparation of target nanoparticles as a selective and effective therapeutic treatment for brain tumors.
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Affiliation(s)
- Huali Zuo
- Australian Institute for Bioengineering and Nanotechnology and ‡The Queensland Brain Institute, The University of Queensland , Brisbane, QLD 4072, Australia
| | - Weiyu Chen
- Australian Institute for Bioengineering and Nanotechnology and ‡The Queensland Brain Institute, The University of Queensland , Brisbane, QLD 4072, Australia
| | - Helen M Cooper
- Australian Institute for Bioengineering and Nanotechnology and ‡The Queensland Brain Institute, The University of Queensland , Brisbane, QLD 4072, Australia
| | - Zhi Ping Xu
- Australian Institute for Bioengineering and Nanotechnology and ‡The Queensland Brain Institute, The University of Queensland , Brisbane, QLD 4072, Australia
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20
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21
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Varga G, Timár Z, Muráth S, Kónya Z, Kukovecz Á, Carlson S, Sipos P, Pálinkó I. Ni-Amino Acid–CaAl-Layered Double Hydroxide Composites: Construction, Characterization and Catalytic Properties in Oxidative Transformations. Top Catal 2017. [DOI: 10.1007/s11244-017-0824-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Sun J, Lei Y, Dai Z, Liu X, Huang T, Wu J, Xu ZP, Sun X. Sustained Release of Brimonidine from a New Composite Drug Delivery System for Treatment of Glaucoma. ACS APPLIED MATERIALS & INTERFACES 2017; 9:7990-7999. [PMID: 28198606 DOI: 10.1021/acsami.6b16509] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
A novel layered double hydroxide (LDH) nanoparticle/thermogel composite drug delivery system (DDS) for sustained release of brimonidine (Bri) has been designed, prepared, and characterized in this study for treatment of severe glaucoma. Brimonidine is first loaded onto LDH (Bri@LDH) nanoparticles, which are then dispersed in the thermogel consisting of plenty of micelles based on poly(dl-lactic acid-co-coglycolic acid)-polyethylene glycol-poly(dl-lactic acid-co-coglycolic acid) (PLGA-PEG-PLGA) copolymer. The Bri@LDH/Thermogel DDS containing 125.0 μg/g of brimonidine has been found to sustainably release the drug for up to 144 h, significantly extending the drug release period compared to that from Bri@LDH nanoparticles. The Bri@LDH/Thermogel DDS is not cytotoxic to human corneal epithelial cells and shows good biocompatibility. In vivo drug release from the special contact lens made of Bri@LDH/Thermogel DDS has been sustained for at least 7 days, which more effectively modulates the relief of intraocular pressure (IOP). Thus, the Bri@LDH/Thermogel DDS is a promising drug delivery alternative that can be used for treatment of severe glaucoma.
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Affiliation(s)
- Jianguo Sun
- Australian Institute for Bioengineering and Nanotechnology, ARC Centre of Excellence for Functional Nanomaterials, The University of Queensland , Brisbane, Queensland 4072, Australia
- State Key Laboratory of Molecular Engineering of Polymers, Fudan University , Shanghai 200433, China
| | | | | | | | | | - Jihong Wu
- State Key Laboratory of Medical Neurobiology, Institutes of Brain Science and Collaborative Innovation Center for Brain Science, Fudan University , Shanghai 200032, China
| | - Zhi Ping Xu
- Australian Institute for Bioengineering and Nanotechnology, ARC Centre of Excellence for Functional Nanomaterials, The University of Queensland , Brisbane, Queensland 4072, Australia
| | - Xinghuai Sun
- State Key Laboratory of Medical Neurobiology, Institutes of Brain Science and Collaborative Innovation Center for Brain Science, Fudan University , Shanghai 200032, China
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23
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Pavlovic M, Rouster P, Szilagyi I. Synthesis and formulation of functional bionanomaterials with superoxide dismutase activity. NANOSCALE 2017; 9:369-379. [PMID: 27924343 DOI: 10.1039/c6nr07672f] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Layered double hydroxide (LDH) nanoparticles were prepared and used as solid support for superoxide dismutase (SOD) enzymes. Structural features were studied by XRD, spectroscopic methods (IR, UV-Vis and fluorescence) and TEM, while colloidal stability of the obtained materials was investigated by electrophoresis and light scattering in aqueous dispersions. The SOD quantitatively adsorbed on the LDH by electrostatic and hydrophobic interactions and kept its structural integrity upon immobilization. The composite material showed moderate resistance against salt-induced aggregation in dispersions, therefore, heparin polyelectrolyte was used to improve the colloidal stability of the system. Heparin of highly negative line charge density strongly adsorbed on the oppositely charged hybrid particles leading to charge neutralization and overcharging at appropriate polyelectrolyte loading. Full coverage of the composite platelets with heparin resulted in highly stable dispersions, which contained only primary particles even at elevated ionic strengths. Our results indicate that the developed bionanocomposite of considerable enzymatic function is a suitable candidate for applications, wherever stable dispersions of antioxidant activity are required for instance in biomedical treatments or in chemical manufacturing processes.
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Affiliation(s)
- Marko Pavlovic
- Department of Inorganic and Analytical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, CH-1205 Geneva, Switzerland.
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24
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Choi G, Piao H, Kim MH, Choy JH. Enabling Nanohybrid Drug Discovery through the Soft Chemistry Telescope. Ind Eng Chem Res 2016. [DOI: 10.1021/acs.iecr.6b02971] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Goeun Choi
- Center
for Intelligent Nano-Bio
Materials (CINBM), Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea
| | - Huiyan Piao
- Center
for Intelligent Nano-Bio
Materials (CINBM), Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea
| | - Myung Hun Kim
- Center
for Intelligent Nano-Bio
Materials (CINBM), Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea
| | - Jin-Ho Choy
- Center
for Intelligent Nano-Bio
Materials (CINBM), Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea
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25
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Pavlovic M, Rouster P, Oncsik T, Szilagyi I. Tuning Colloidal Stability of Layered Double Hydroxides: From Monovalent Ions to Polyelectrolytes. Chempluschem 2016; 82:121-131. [DOI: 10.1002/cplu.201600295] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Revised: 07/18/2016] [Indexed: 02/03/2023]
Affiliation(s)
- Marko Pavlovic
- Department of Inorganic and Analytical Chemistry; University of Geneva; 30 Quai Ernest-Ansermet 1205 Geneva Switzerland
| | - Paul Rouster
- Department of Inorganic and Analytical Chemistry; University of Geneva; 30 Quai Ernest-Ansermet 1205 Geneva Switzerland
| | - Tamas Oncsik
- Department of Inorganic and Analytical Chemistry; University of Geneva; 30 Quai Ernest-Ansermet 1205 Geneva Switzerland
| | - Istvan Szilagyi
- Department of Inorganic and Analytical Chemistry; University of Geneva; 30 Quai Ernest-Ansermet 1205 Geneva Switzerland
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26
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Pavlovic M, Huber R, Adok-Sipiczki M, Nardin C, Szilagyi I. Ion specific effects on the stability of layered double hydroxide colloids. SOFT MATTER 2016; 12:4024-4033. [PMID: 26997621 DOI: 10.1039/c5sm03023d] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Positively charged layered double hydroxide particles composed of Mg(2+) and Al(3+) layer-forming cations and NO3(-) charge compensating anions (MgAl-NO3-LDH) were synthesized and the colloidal stability of their aqueous suspensions was investigated in the presence of inorganic anions of different charges. The formation of the layered structure was confirmed by X-ray diffraction, while the charging and aggregation properties were explored by electrophoresis and light scattering. The monovalent anions adsorb on the oppositely charged surface to a different extent according to their hydration state leading to the Cl(-) > NO3(-) > SCN(-) > HCO3(-) order in surface charge densities. The ions on the right side of the series induce the aggregation of MgAl-NO3-LDH particles at lower concentrations, whereas in the presence of the left ones, the suspensions are stable even at higher salt levels. The adsorption of multivalent anions gave rise to charge neutralization and charge reversal at appropriate concentrations. For some di, tri and tetravalent ions, charge reversal resulted in restabilization of the suspensions in the intermediate salt concentration regime. Stable samples were also observed at low salt levels. Particle aggregation was fast near the charge neutralization point and at high concentrations. These results, which evidence the colloidal stability of MgAl-NO3-LDH in the presence of various anions, are of prime fundamental interest. These are also critical for applications to develop stable suspensions of primary particles for water purification processes, with the aim of the removal of similar anions by ion exchange.
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Affiliation(s)
- Marko Pavlovic
- Department of Inorganic and Analytical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, CH-1205 Geneva, Switzerland.
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