Abstract:
:α-Lipoic acid (ALA) is a powerful antioxidant valuable for prevention and treatment of ophthalmic complications such as diabetic keratopathy and retinopathy. The aim of this work was to develop micelle-based formulations that can enhance the solubility, stability, and corneal permeability of ALA. Compared to a conventional surfactant (sodium dioctylsulfosuccinate), Soluplus(®) (polyvinyl caprolactam-polyvinyl acetate-polyethylene glycol copolymer) led to smaller micelles (70-80 vs. 240-528 nm) with improved ability to solubilize ALA, maintaining ocular compatibility (Hens Egg Test on the Chorio-Allantoic Membrane). Soluplus nanomicelles enhanced more than 10-fold ALA solubility compared to common eye drops and withstood strong dilution in lachrymal fluid, filtration through sterilizing membranes, and freeze-drying. Interestingly, Soluplus nanomicelle formulation prepared with 1 or 2 mM block copolymer concentration exhibited in situ gelling capability and transformed into weak gels at 35°C, which is expected to increase corneal residence time. Bovine corneal permeability revealed that Soluplus nanomicelles notably enhanced ALA accumulation into the cornea as well as flux of drug toward the receptor chamber. Overall, these findings point out Soluplus nanomicelles as suitable carriers of ALA that may exhibit improved performance compared to currently available eye drop solutions.
journal_name
J Pharm Scijournal_title
Journal of pharmaceutical sciencesauthors
Alvarez-Rivera F,Fernández-Villanueva D,Concheiro A,Alvarez-Lorenzo Cdoi
10.1016/j.xphs.2016.03.006subject
Has Abstractpub_date
2016-09-01 00:00:00pages
2855-2863issue
9eissn
0022-3549issn
1520-6017pii
S0022-3549(16)00434-2journal_volume
105pub_type
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