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The preparation of HEMA-MPC films for ocular drug delivery

Al-Shohani, A; Awwad, S; Khaw, PT; Brocchini, SJ; (2017) The preparation of HEMA-MPC films for ocular drug delivery. British Journal of Pharmacy , 2 (1) , Article 5. 10.5920/bjpharm.2017.05. Green open access

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There is a need to prolong drug residence time using a biocompatible formulation in the subconjunctival space after surgery to treat glaucoma. Drug releasing discs were prepared with 2-(hydroxyethyl)methacrylate (HEMA) and 2-methacryloyl-oxyethyl phosphorylcholine (MPC). The ratio of bound water (Wb) to free water (Wf) ratio increased from 1:0.3 to 1:6.8 with increasing MPC (0 to 50%, w/w). The optimal balance between water content, SR and mechanical strength were obtained with 10% MPC (w/w) hydrogels. Water-alcohol mixtures were examined to facilitate loading of poorly soluble drugs, and they showed greater hydrogel swelling than either water or alcohol alone. The SR was 1.2 ± 0.02 and 3.3 ± 0.1 for water and water:ethanol (1:1) respectively. HEMA-MPC (10%) discs were loaded with dexamethasone using either water:ethanol (1:1) or methanol alone. Drug release was examined in an outflow rig model that mimics the subconjunctival space in the eye. Dexamethasone loading increased from 0.3 to 1.9 mg/disc when the solvent was changed from water:ethanol (1:1) to methanol with the dexamethasone half-life (t½) increasing from 1.9 to 9.7 days respectively. These encouraging results indicate that HEMA-MPC hydrogels have the potential to sustain the residence time of a drug in the subconjunctival space of the eye.

Type: Article
Title: The preparation of HEMA-MPC films for ocular drug delivery
Open access status: An open access version is available from UCL Discovery
DOI: 10.5920/bjpharm.2017.05
Publisher version: http://dx.doi.org/10.5920/bjpharm.2017.05
Language: English
Additional information: Open Access under the Creative Commons CC BY 4.0 Licence (https://creativecommons.org/licenses/by/4.0/).
Keywords: Hydrogels, polymer, ocular, drug delivery
URI: http://discovery.ucl.ac.uk/id/eprint/1573469
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