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去乙酰结冷胶的原位凝胶中的新颖物质用于酮替芬 (Ketotifen) 眼科药物的持续递送：在体外和体内的评价

 

Authors Zhu L, Ao J, Li P
Published Date July 2015 Volume 2015:9 Pages 3943—3949
DOI http://dx.doi.org/10.2147/DDDT.S87368
Received 26 April 2015, Accepted 3 June 2015, Published 29 July 2015

Peer reviewers approved by Dr Syed Nasir Abbas Bhukari

Approved for publication by Professor Shu-Feng Zhou

Abstract: In this study, an ion-activated ketotifen ophthalmic delivery system was developed by using a natural polysaccharide, deacetylase gellan gum. Its rheological aracteristics, stability, in vitro gelation, release in vitro, and pharmacodynamic activity in vivo were investigated. The formulation had an optimum viscosity that will allow easy drop as a liquid, which then underwent a rapid sol–gel transition due to ionic interaction. There were negligible alterations in the initial values of viscosity of the formulations over a storage period of 180 days. The in vitro release profiles indicated that the release of ketotifen from in situ gels exhibited a sustained feature. Scintigraphic studies indicated that deacetylase gellan gum could increase the residence time of the formulation. At the same dose, in situ gels demonstrated a typical sustained and prolonged drug-effects behavior compared with the common drops.

Keywords: ophthalmic delivery, deacetylase gellan gum, sol–gel transition, scintigraphic studies, pharmacodynamics


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