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Reis IM, Dixon PJ, Sekar P, Chauhan A. Sustained Delivery of Olopatadine from Vitamin-E Loaded Contact Lenses. J Ocul Pharmacol Ther 2024; 40:126-135. [PMID: 38489059 PMCID: PMC11265619 DOI: 10.1089/jop.2023.0111] [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: 08/19/2023] [Accepted: 12/03/2023] [Indexed: 03/17/2024] Open
Abstract
Purpose: Topical antihistamines, such as olopatadine hydrochloride, an H1 receptor antagonist, are commonly prescribed for treating allergic conjunctivitis. Drug delivery via eye drops has many deficiencies including a short residence time due to tear drainage via the nasolacrimal duct, which results in a low bioavailability and potential for side effects. These deficiencies could be mitigated by a drug-eluting contact lens such as the recently approved ACUVUE® THERAVISION™ WITH KETOTIFEN which is a daily disposable etafilcon, a drug-eluting contact lens with ketotifen (19 μg per lens). Here, we investigate the feasibility of designing a drug-eluting lens with sustained release of olopatadine for treating allergies using an extended wear lens. Methods: Nanobarrier depots composed of vitamin-E (VE) are formed through direct entrapment by ethanol-driven swelling. The drug-loaded lenses are characterized for transparency and water content. In vitro release is measured under sink conditions and fitted to a diffusion control release model to determine diffusivity and partition coefficient. Results: In vitro studies indicate that ACUVUE OASYS® and ACUVUE TruEye™ lenses loaded with ∼0.3 g of VE/g of hydrogel effectively prolong olopatadine dynamics by 7-fold and 375-fold, respectively. Incorporation of VE into the lenses retains visible light transmission and other properties. Conclusion: The VE incorporation in commercial lenses significantly increases the release duration offering the possibility of antiallergy extended wear lenses.
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Affiliation(s)
- Inês M. Reis
- Department of Chemical Engineering, University of Florida, Gainesville, Florida, USA
| | - Philip J. Dixon
- Department of Chemical Engineering, University of Florida, Gainesville, Florida, USA
| | - Poorvajan Sekar
- Department of Chemical Engineering, University of Florida, Gainesville, Florida, USA
| | - Anuj Chauhan
- Department of Chemical Engineering, University of Florida, Gainesville, Florida, USA
- Department of Chemical Engineering, Colorado School of Mines, Golden, Colorado, USA
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Lovrec-Krstič T, Orthaber K, Maver U, Sarenac T. Review of Potential Drug-Eluting Contact Lens Technologies. MATERIALS (BASEL, SWITZERLAND) 2023; 16:ma16103653. [PMID: 37241280 DOI: 10.3390/ma16103653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 05/05/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023]
Abstract
The field of ophthalmology is expanding exponentially, both in terms of diagnostic and therapeutic capabilities, as well as the worldwide increasing incidence of eye-related diseases. Due to an ageing population and climate change, the number of ophthalmic patients will continue to increase, overwhelming healthcare systems and likely leading to under-treatment of chronic eye diseases. Since drops are the mainstay of therapy, clinicians have long emphasised the unmet need for ocular drug delivery. Alternative methods, i.e., with better compliance, stability and longevity of drug delivery, would be preferred. Several approaches and materials are being studied and used to overcome these drawbacks. We believe that drug-loaded contact lenses are among the most promising and are a real step toward dropless ocular therapy, potentially leading to a transformation in clinical ophthalmic practice. In this review, we outline the current role of contact lenses in ocular drug delivery, focusing on materials, drug binding and preparation, concluding with a look at future developments.
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Affiliation(s)
- Tina Lovrec-Krstič
- Community Health Centre Dr. Adolfa Drolca Maribor, Department of Radiology with Centre for Breast Disease, Ulica talcev 5, 2000 Maribor, Slovenia
| | - Kristjan Orthaber
- Department of Anesthesiology, Intensive Care and Pain Therapy, University Medical Center Maribor, Ljubljanska 5, 2000 Maribor, Slovenia
| | - Uroš Maver
- Institute of Biomedical Sciences and Department of Pharmacology, Faculty of Medicine, University of Maribor, Taborska ulica 8, 2000 Maribor, Slovenia
| | - Tomislav Sarenac
- Department of Ophthalmology, University Medical Center Maribor, Ljubljanska 5, 2000 Maribor, Slovenia
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3
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Akbari E, Imani R, Shokrollahi P, Jarchizadeh R, Heidari keshel S. Hydrogel-based formulations for drug delivery to the anterior segment of the eye. J Drug Deliv Sci Technol 2023. [DOI: 10.1016/j.jddst.2023.104250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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4
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Macoon R, Chauhan A. Ophthalmic delivery of hydrophilic drugs through drug-loaded oleogels. Eur J Pharm Sci 2021; 158:105634. [DOI: 10.1016/j.ejps.2020.105634] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 10/26/2020] [Accepted: 10/27/2020] [Indexed: 10/23/2022]
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Macoon R, Guerriero T, Chauhan A. Extended release of dexamethasone from oleogel based rods. J Colloid Interface Sci 2019; 555:331-341. [PMID: 31394320 PMCID: PMC6764860 DOI: 10.1016/j.jcis.2019.07.082] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 07/26/2019] [Accepted: 07/27/2019] [Indexed: 12/18/2022]
Abstract
HYPOTHESIS Topical and systemic methods are not able to deliver ophthalmic drugs for treatment of retinal diseases. Consequently, invasive monthly intravitreal injections through the eyeball are required to deliver retinal drugs. A reduction in the frequency of the injection through extended release of the drugs could have significant clinical benefits. EXPERIMENTS Oleogels containing ethyl cellulose as the gelator at 10% (wt%) in soybean oil were loaded with dexamethasone above the solubility limit and expunged from a syringe to create cylindrical rods for extended drug delivery. The devices were imaged to explore particle distribution and drug release was measured under sink conditions in buffer. A model was developed and fitted to data to determine effective drug diffusivity. FINDINGS Dexamethasone is released slowly due to the presence of the drug particles that serve as drug depots. The release increases from 600 to 3000 h as the drug loading is increased from 3% to 28%. The release profiles can be modeled by considering drug dissolution and diffusion, as well as the tortuosity of the matrix due to the presence of the voids formed after the drug particles have dissolved. The proposed approach is promising as the release profiles of the drug are comparable to commercial devices.
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Affiliation(s)
- Russell Macoon
- Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, United States.
| | - Timothy Guerriero
- Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, United States.
| | - Anuj Chauhan
- Department of Chemical Engineering, Colorado School of Mines, Golden, CO 80401, United States.
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6
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Gómez-Ballesteros M, Andrés-Guerrero V, Parra FJ, Marinich J, de-Las-Heras B, Molina-Martínez IT, Vázquez-Lasa B, San Román J, Herrero-Vanrell R. Amphiphilic Acrylic Nanoparticles Containing the Poloxamer Star Bayfit® 10WF15 as Ophthalmic Drug Carriers. Polymers (Basel) 2019; 11:E1213. [PMID: 31331090 PMCID: PMC6680529 DOI: 10.3390/polym11071213] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 07/12/2019] [Accepted: 07/17/2019] [Indexed: 12/21/2022] Open
Abstract
Topical application of drops containing ocular drugs is the preferred non-invasive route to treat diseases that affect the anterior segment of the eye. However, the formulation of eye drops is a major challenge for pharmacists since the access of drugs to ocular tissues is restricted by several barriers. Acetazolamide (ACZ) is a carbonic anhydrase inhibitor used orally for the treatment of ocular hypertension in glaucoma. However, large ACZ doses are needed which results in systemic side effects. Recently, we synthesized copolymers based on 2-hydroxyethyl methacrylate (HEMA) and a functionalized three-arm poloxamer star (Bayfit-MA). The new material (HEMA/Bayfit-MA) was engineered to be transformed into nanoparticles without the use of surfactants, which represents a significant step forward in developing new ophthalmic drug delivery platforms. Acetazolamide-loaded nanocarriers (ACZ-NPs) were prepared via dialysis (224 ± 19 nm, -17.2 ± 0.4 mV). The in vitro release rate of ACZ was constant over 24 h (cumulative delivery of ACZ: 83.3 ± 8.4%). Following standard specifications, ACZ-NPs were not cytotoxic in vitro in cornea, conjunctiva, and macrophages. In normotensive rabbits, ACZ-NPs generated a significant intraocular pressure reduction compared to a conventional solution of ACZ (16.4% versus 9.6%) with the same dose of the hypotensive drug (20 µg). In comparison to previously reported studies, this formulation reduced intraocular pressure with a lower dose of ACZ. In summary, HEMA:Bayfit-MA nanoparticles may be a promising system for ocular topical treatments, showing an enhanced ocular bioavailability of ACZ after a single instillation on the ocular surface.
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Affiliation(s)
- Miguel Gómez-Ballesteros
- Department of Pharmaceutics and Food Technology, Faculty of Pharmacy, Complutense University of Madrid (UCM), IdISSC, 28040 Madrid, Spain
| | - Vanessa Andrés-Guerrero
- Department of Pharmaceutics and Food Technology, Faculty of Pharmacy, Complutense University of Madrid (UCM), IdISSC, 28040 Madrid, Spain
- Ocular Pathology National Net (OFTARED) of the Institute of Health Carlos III, 28029 Madrid, Spain
| | - Francisco Jesús Parra
- Institute of Polymer Science and Technology, ICTP-CSIC, and CIBER-BBN, 28006 Madrid, Spain
| | - Jorge Marinich
- Department of Pharmaceutics and Food Technology, Faculty of Pharmacy, Complutense University of Madrid (UCM), IdISSC, 28040 Madrid, Spain
| | - Beatriz de-Las-Heras
- Ocular Pathology National Net (OFTARED) of the Institute of Health Carlos III, 28029 Madrid, Spain
- Department of Pharmacology, Faculty of Pharmacy, Complutense University of Madrid (UCM), 28040 Madrid, Spain
| | - Irene Teresa Molina-Martínez
- Department of Pharmaceutics and Food Technology, Faculty of Pharmacy, Complutense University of Madrid (UCM), IdISSC, 28040 Madrid, Spain
- Ocular Pathology National Net (OFTARED) of the Institute of Health Carlos III, 28029 Madrid, Spain
| | - Blanca Vázquez-Lasa
- Institute of Polymer Science and Technology, ICTP-CSIC, and CIBER-BBN, 28006 Madrid, Spain.
| | - Julio San Román
- Institute of Polymer Science and Technology, ICTP-CSIC, and CIBER-BBN, 28006 Madrid, Spain
| | - Rocío Herrero-Vanrell
- Department of Pharmaceutics and Food Technology, Faculty of Pharmacy, Complutense University of Madrid (UCM), IdISSC, 28040 Madrid, Spain.
- Ocular Pathology National Net (OFTARED) of the Institute of Health Carlos III, 28029 Madrid, Spain.
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7
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Kapoor Y, Dixon P, Sekar P, Chauhan A. Incorporation of drug particles for extended release of Cyclosporine A from poly-hydroxyethyl methacrylate hydrogels. Eur J Pharm Biopharm 2017; 120:73-79. [DOI: 10.1016/j.ejpb.2017.08.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 06/06/2017] [Accepted: 08/14/2017] [Indexed: 10/19/2022]
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Bouledjouidja A, Masmoudi Y, Li Y, He W, Badens E. Supercritical impregnation and optical characterization of loaded foldable intraocular lenses using supercritical fluids. J Cataract Refract Surg 2017; 43:1343-1349. [DOI: 10.1016/j.jcrs.2017.07.033] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 07/17/2017] [Accepted: 07/28/2017] [Indexed: 01/22/2023]
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Lallemand F, Schmitt M, Bourges JL, Gurny R, Benita S, Garrigue JS. Cyclosporine A delivery to the eye: A comprehensive review of academic and industrial efforts. Eur J Pharm Biopharm 2017; 117:14-28. [PMID: 28315447 DOI: 10.1016/j.ejpb.2017.03.006] [Citation(s) in RCA: 120] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Revised: 03/09/2017] [Accepted: 03/11/2017] [Indexed: 11/20/2022]
Abstract
Local ocular delivery of cyclosporine A (CsA) is the preferred method for CsA delivery as a treatment for ocular inflammatory diseases such as uveitis, corneal healing, vernal keratoconjunctivitis and dry eye disease. However, due to the large molecular weight and hydrophobic nature of CsA and the natural protective mechanisms of the eye, achieving therapeutic levels of CsA in ocular tissues can be difficult. This review gives a comprehensive overview of the current products available to clinicians as well as emerging drug delivery solutions that have been developed at both the academic and industry levels.
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Affiliation(s)
| | | | - Jean-Louis Bourges
- Department of Ophthalmology, Paris Descartes School of Medicine, Assistance Publique-Hôpitaux de Paris, Cochin-Hôtel-Dieu Hospital, Université Sorbonne Paris Cité, Paris, France
| | - Robert Gurny
- School of Pharmaceutical Sciences, University of Geneva, Geneva, Switzerland
| | - Simon Benita
- The Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Ein Kerem, Israel
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10
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Al-Saedi ZHF, Alzhrani RM, Boddu SHS. Formulation and In Vitro Evaluation of Cyclosporine-A Inserts Prepared Using Hydroxypropyl Methylcellulose for Treating Dry Eye Disease. J Ocul Pharmacol Ther 2016; 32:451-62. [PMID: 27294697 DOI: 10.1089/jop.2016.0013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
PURPOSE The aim of this study was to develop and characterize a novel sustained-release drug delivery system of cyclosporine-A (CsA) using hydroxypropyl methylcellulose (HPMC) and xanthan gum (XG) for treating dry eye disease (DED). METHODS Polymeric inserts of CsA were prepared using the solvent casting technique with a 2(3) full factorial design to evaluate the effect of HPMC and XG ratios and drug content on thickness, folding endurance, wettability, and in vitro drug release. Inserts were also evaluated for drug content, moisture absorption and loss, and surface pH. Inserts with an optimized ratio of HPMC and XG were sterilized with UV light and evaluated for morphology, thermal analysis, Fourier transform infrared spectroscopy, stability at 4°C, 25°C, and 40°C, cytotoxicity in cultured bovine corneal endothelial cells, and anti-inflammatory effect in Jurkat T cells. RESULTS The addition of XG increased the CsA release duration and enhanced the folding endurance of films. All films showed uniformity in drug content and thickness. Formulation F4 composed of 1% HPMC and 0.25% XG exhibited good folding endurance and sustained CsA release for up to 20 h. Sterility testing of F4 using plate and direct inoculation confirmed the formulation sterility and validated the sterilization method. The formulation was stable for at least 3 months at 4°C, 25°C, and 40°C. No cytotoxicity was observed in cultured bovine corneal endothelial cells for up to 24 h. The anti-inflammatory effect of CsA was intact in ophthalmic inserts. CONCLUSION In conclusion, combination therapy with HPMC and CsA can be a potential once-a-day formulation for treating DED.
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Affiliation(s)
- Zahraa H F Al-Saedi
- Department of Pharmacy Practice, College of Pharmacy and Pharmaceutical Sciences, The University of Toledo Health Science Campus , Toledo, Ohio
| | - Rami M Alzhrani
- Department of Pharmacy Practice, College of Pharmacy and Pharmaceutical Sciences, The University of Toledo Health Science Campus , Toledo, Ohio
| | - Sai H S Boddu
- Department of Pharmacy Practice, College of Pharmacy and Pharmaceutical Sciences, The University of Toledo Health Science Campus , Toledo, Ohio
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11
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Abstract
Contact lenses for ophthalmic drug delivery have become very popular, due to their unique advantages like extended wear and more than 50% bioavailability. To achieve controlled and sustained drug delivery from contact lenses, researchers are working on various systems like polymeric nanoparticles, microemulsion, micelle, liposomes, use of vitamin E, etc. Numerous scientists are working on different areas of therapeutic contact lenses to treat ocular diseases by implementing techniques like soaking method, molecular imprinting, entrapment of drug-laden colloidal nanoparticles, drug plate/film, ion ligand polymeric systems, supercritical fluid technology, etc. Though sustained drug delivery was achieved using contact lens, the critical properties such as water content, tensile strength (mechanical properties), ion permeability, transparency and oxygen permeability were altered, which limit the commercialization of therapeutic contact lenses. Also issues like drug stability during processing/fabrication (drug integrity test), zero order release kinetics (prevent burst release), drug release during monomer extraction step after fabrication (to remove un-reacted monomers), protein adherence, drug release during storage in packaging solution, shelf life study, cost-benefit analysis, etc. are still to be addressed. This review provides an expert opinion on different methodology to develop therapeutic contact lenses with special remark of their advantages and limitations.
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Affiliation(s)
- Furqan A Maulvi
- a Maliba Pharmacy College, Uka Tarsadia University , Gujarat , India
| | - Tejal G Soni
- b Faculty of Pharmacy , Dharmsinh Desai University , Gujarat , India
| | - Dinesh O Shah
- c Shah-Schulman Center for Surface Science and Nanotechnology, Dharmsinh Desai University , Gujarat , India.,d Department of Chemical Engineering and Department of Anaesthesiology , University of Florida , FL , USA , and.,e School of Earth and Environmental Sciences, Columbia University , New York , USA
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12
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Maulvi FA, Soni TG, Shah DO. Extended release of hyaluronic acid from hydrogel contact lenses for dry eye syndrome. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2015; 26:1035-50. [DOI: 10.1080/09205063.2015.1072902] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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13
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Shikamura Y, Yamazaki Y, Matsunaga T, Sato T, Ohtori A, Tojo K. Hydrogel Ring for Topical Drug Delivery to the Ocular Posterior Segment. Curr Eye Res 2015; 41:653-61. [DOI: 10.3109/02713683.2015.1050738] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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14
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Chaiyasan W, Srinivas SP, Tiyaboonchai W. Mucoadhesive chitosan-dextran sulfate nanoparticles for sustained drug delivery to the ocular surface. J Ocul Pharmacol Ther 2013; 29:200-7. [PMID: 23356788 DOI: 10.1089/jop.2012.0193] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
PURPOSE To characterize nanoparticles produced by self-assembly of oppositely charged polymers, cationic chitosan (CS), and anionic dextran sulfate (DS), for drug delivery to the ocular surface. The goal is to overcome the short residence time of topical drugs through their sustained release from mucoadhesive nanoparticles. METHODS Chitosan-dextran sulfate nanoparticles (CDNs) were produced by mixing CS and DS; polyethylene glycol-400 was used as a surface stabilizing agent. Fourier transform infrared spectroscopy (FTIR) spectra of CS, DS, and CDNs were determined in the wavenumber range of 4,000-700 cm(-1) to assess the ionic interactions in the formation of CDNs. The physicochemical properties, entrapment efficacy, and dissolution profile of CDNs were investigated using Rhodamine B (RhB) and Nile Red (NR) as drug analogs. The mucoadhesiveness of the CDNs was assessed by imaging the retention of the fluorescein isothiocyanate-labeled CDNs on the cornea ex vivo, which was subjected to shear stress by a steady stream of saline solution. RESULTS CDNs were obtained by the polyelectrolyte complexation technique. The FTIR spectra of CDNs showed spectral shifts in the amine and sulfate regions, confirming an involvement of electrostatic interactions between cationic CS and anionic DS. The CDNs were spherical in shape and segregated. They possessed a particle size of ~400 nm with a polydispersity index of 0.3 and exhibited a zeta potential of ~40 mV. A high entrapment efficacy of up to 80% was observed with both RhB and NR. In the dissolution experiments, NR was released from CDNs within 60 min, but RhB was not released. This indicates that the release of drugs could depend on their molecular interactions with the particle. Exposure of CDNs to lysozyme, which is found in tears, had no effect on the mean particle size or the surface charge. Instillation of NR, RhB, and FITC in the presence of saline irrigation resulted in their rapid disappearance (<5 min) from the corneal surface. In contrast, fluorescent CDNs showed retention on the cornea even after 60 min. CONCLUSIONS Cationic and biocompatible mucoadhesive CDNs have been developed for sustained drug delivery to the ocular surface. The CDNs were stable to lysozyme and showed prolonged adherence to the corneal surface.
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Affiliation(s)
- Wanachat Chaiyasan
- Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Naresuan University, Phitsanulok, Thailand
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15
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Peng CC, Chauhan A. Extended cyclosporine delivery by silicone-hydrogel contact lenses. J Control Release 2011; 154:267-74. [PMID: 21745507 DOI: 10.1016/j.jconrel.2011.06.028] [Citation(s) in RCA: 96] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2011] [Revised: 05/22/2011] [Accepted: 06/18/2011] [Indexed: 11/15/2022]
Abstract
Cyclosporine A (CyA) is effective in treating chronic dry eyes and contact lens mediated dry eyes. CyA is delivered through eye drops of an oil-in-water emulsion, which has a small residence time in the eyes, leading to low bioavailability. Here we explore delivery of CyA from contact lenses to provide controlled and extended drug delivery with an increased bioavailability due to enhanced ocular residence time. Loading and release profiles of CyA from commercial contact lenses are presented to show that 1-DAY ACUVUE® releases CyA for about a day and extended wear silicone hydrogel (SiH) lenses release CyA for about 2-weeks. The longer duration from SiH lenses compared to the 1-DAY ACUVUE®lens is due to larger partition coefficients in the gel. A novel approach is presented for increasing release duration from the SiH lenses to the desired 1-month through incorporation of Vitamin E. The results show that Vitamin E loaded lenses can provide CyA release within the therapeutic window for a period of about a month. This pilot study demonstrates the promising potential of delivering CyA from contact lens for treatment of chromic dry eyes and contact lens mediated dry eyes.
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Affiliation(s)
- Cheng-Chun Peng
- Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA
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16
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Peng C, Bengani L, Jung H, Leclerc J, Gupta C, Chauhan A. Emulsions and microemulsions for ocular drug delivery. J Drug Deliv Sci Technol 2011. [DOI: 10.1016/s1773-2247(11)50010-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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17
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Parra FJ, Rodríguez-Alonsob L, Marinich J, Herrero-Vanrell R, Fernández-Gutiérreza M, Vázquez B, Román JS. Random co-polymers based on the poloxamer Bayfit® 10WF15 for biomedical applications. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2010; 22:1895-916. [PMID: 20961494 DOI: 10.1163/092050610x529146] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Random co-polymers were prepared from the poloxamer Bayfit(®) 10WF15 and their thermal and biological properties analyzed. The poloxamer was characterized, functionalized with methacrylate groups (Bayfit-MA) and further co-polymerized with 2-hydroxyethyl methacrylate (HEMA) with Bayfit-MA feed contents of 1, 5 and 10 wt%. Co-polymers were partially soluble in organic solvents and exhibited a single glass transition temperature indicative of a random monomer distribution in the macromolecular chains. In thermogravimetric studies the co-polymers showed two degradation stages, around 210 and 350 °C, respectively. The thermosensitive behaviour of the poloxamer was studied by turbidimetry. Cloud point temperatures of aqueous solutions of Bayfit(®) 10WF15 (0.5-5 wt%) ranged from 15 to 18 °C and for Bayfit(®) 10WF15 methacrylate (0.5-1 wt%) from 6 to 7 °C. DSC thermograms of hydrated co-polymers showed the typical endothermic peaks with phase transition temperatures close to that of physiological medium. The biocompatibility of initial poloxamer and derivatives was analyzed with human fibroblasts cultures. The IC(50) value of Bayfit(®) 10WF15 was 1.4 mg/ml. Cellular extracts of the co-polymers were not cytotoxic and cellular proliferation and DNA content depended on co-polymer composition.
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Affiliation(s)
- F J Parra
- Institute of Polymer Science and Technology, CSIC, C/Juan de la Cierva 3, 28006 Madrid, Spain
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