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• W2775493057 abstract "The objective was to investigate (trans)corneal and transscleral iontophoresis of biolabile amino acid ester prodrugs of aciclovir (ACV-X, X = Arg, Gly and Trp) as a means to increase ocular bioavailability of ACV. Prodrugs displayed tissue-dependent susceptibility to hydrolysis. Iontophoresis of ACV-Arg, ACV-Gly and ACV-Trp (5 mM, 0.5 mA/cm2) for 5 min followed by 55 min passive diffusion resulted in appreciable corneal deposition (21.5 ± 5.1, 14.1 ± 2.0 and 5.3 ± 0.6 nmol/cm2, respectively) and transcorneal permeation (13.9 ± 1.6, 10.9 ± 1.8 and 5.7 ± 0.5 nmol/cm2, respectively) of ACV species. In contrast, passive delivery of ACV across porcine cornea after 1 h was < LOQ (i.e. <0.125 nmol/cm2). Transscleral permeation of ACV-Arg, ACV-Gly and ACV-Trp (9 mM, 1.25 mA/cm2) after iontophoresis for 5 min was 20.4 ± 3.8, 12.3 ± 0.3 and 8.4 ± 0.4 nmol/cm2, respectively – far superior to passive delivery which was again < LOQ. Using intact porcine eye globes, 5 min transscleral iontophoresis of ACV-Gly at 3.75 mA/cm2 resulted in considerable delivery of ACV species to the choroid/retina and vitreous humour (5.7 ± 2.3 and 11.7 ± 3.7 nmol/cm2, respectively). Furthermore, the average concentration of ACV species in the whole eyeball (4.5 ± 1.6 nmol/cm3) was significantly higher than the IC50 of ACV against HSV-1 (<0.22 nmol/cm3), demonstrating the potential application for the treatment of ocular HSV infections." @default.
• W2775493057 created "2017-12-22" @default.
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• W2775493057 date "2018-01-01" @default.
• W2775493057 modified "2023-09-23" @default.
• W2775493057 title "Short-duration ocular iontophoresis of ionizable aciclovir prodrugs: A new approach to treat herpes simplex infections in the anterior and posterior segments of the eye" @default.
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• W2775493057 doi "https://doi.org/10.1016/j.ijpharm.2017.11.069" @default.
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