An in vitro model for investigating the gastric mucosal retention of 14C-labelled poly(acrylic acid) dispersions

Riley, R.G., Smart, J.D., Tsibouklis, J., Young, S.A., Hampson, F., Davis, A., Kelly, G., Dettmar, P.W. and Wilber, W.R. (2002) An in vitro model for investigating the gastric mucosal retention of 14C-labelled poly(acrylic acid) dispersions International journal of pharmaceutics, 236 (1-2). pp. 87-96. ISSN 0378-5173

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Abstract

Polymers that bind from solution onto gastric mucosae can be used as a means of facilitating localised drug delivery, or act as therapeutic agents in their own right (e.g. by forming a protective layer or by inhibiting enzymes). Previous workers have used semi-quantitative methods to identify the ability of commercially available poly(acrylic acid)s to bind to gastric mucosa. In this study, the binding and retention of labelled poly(acrylic acid)s to sections of gastric mucosa from the pyloric region of pigs stomach were evaluated using ‘static’ and ‘dynamic flow’ test systems. Dispersions (3%) of ‘low’, ‘high’ and ‘ultra high’ (cross-linked) polymers were seen to adhere to porcine pyloric mucosa after exposure and rinsing in the ‘static’ system. The high molecular weight polymer showed the greatest retention in the ‘dynamic’ test system when washing continuously with simulated gastric acid. Changing the pH of the dispersions from 4.3 to 6.2 had little effect on polymer retention. It was concluded that polymers that were sufficiently mobile in solution to spread on, and interact with, the mucosal surface, but had a sufficiently high molecular weight to form viscous solutions and/or bioadhere to the mucosa, may be retained on the mucosal surface for the longest periods.

Item Type:Journal article
Uncontrolled Keywords:Mucoadhesion; Bioadhesion; Poly(acrylic acid)s; Gastric mucosa
Subjects:B000 Health Professions > B200 Pharmacology Toxicology and Pharmacy > B240 Pharmaceutics
DOI (a stable link to the resource):10.1016/S0378-5173(02)00014-5
Faculties:Faculty of Science and Engineering > School of Pharmacy and Biomolecular Sciences
ID Code:969
Deposited By:editor spbs
Deposited On:01 Dec 2006
Last Modified:11 Jun 2013 13:43

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