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Thiolated polycarbophil/glutathione: Defining its potential as a permeation enhancer for oral drug administration in comparison to sodium caprate.
MedLine Citation:
PMID:  21554106     Owner:  NLM     Status:  Publisher    
Thiolated polyacrylates were shown to be permeation enhancers with notable potential. The aim of this study was to evaluate the permeation enhancing properties of a thiolated polycarbophil/glutathione (PCP-Cys/GSH) system for oral drug application in comparison to a well-established permeation enhancer, namely sodium caprate. In vitro permeation studies were conducted in Ussing-type chambers with sodium fluoresceine (NaFlu) and fluoresceine isothiocyanate labeled dextran (molecular mass 4 kDa; FD4) as model compounds. Bioavailability studies were carried out in Sprague Dawley rats with various formulations. Moreover, cytotoxic effects of both permeation enhancers were compared. Permeation enhancement ratios of 1% sodium caprate were found to be 3.0 (FD4) and 2.3 (NaFlu), whereas 1% PCP-Cys/0.5% GSH displayed enhancement ratios of 2.4 and 2.2. Both excipients performed at a similar level in vivo. Sodium caprate solutions increased oral bioavailability 2.2-fold (FD4) and 2.3-fold (NaFlu), while PCP-Cys hydrogels led to a 3.2-fold and 2.2-fold enhancement. Cell viability experiments revealed a significantly higher tolerance of Caco-2 cells towards 0.5% PCP-Cys (81% survival) compared to 0.5% sodium caprate (5%). As PCP-Cys is not absorbed from mucosal membranes due to its comparatively high molecular mass, systemic side-effects can be excluded. In conclusion, both systems displayed a similar potency for permeation enhancement of hydrophilic compounds. However, PCP-Cys seems to be less harmful to cultured cells.
Glen Perera; Jan Barthelmes; Anja Vetter; Christof Krieg; Cindy Uhlschmied; Günther K Bonn; Andreas Bernkop-Schnürch
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-5-9
Journal Detail:
Title:  Drug delivery     Volume:  -     ISSN:  1521-0464     ISO Abbreviation:  -     Publication Date:  2011 May 
Date Detail:
Created Date:  2011-5-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9417471     Medline TA:  Drug Deliv     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Pharmaceutical Technology, Institute of Pharmacy, University of Innsbruck, Innrain 52, Josef-Möller-Haus, 6020 Innsbruck, Austria.
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