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Glutamine‐chitosan microparticles as oral insulin delivery matrix: In vitro characterization
Author(s) -
Rekha M. R.,
Sharma Chandra P.
Publication year - 2011
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.34315
Subject(s) - chitosan , permeation , chemistry , dextran , in vitro , polyelectrolyte , bioavailability , confocal microscopy , monolayer , glutamine , nuclear chemistry , chemical engineering , biophysics , chromatography , polymer , membrane , biochemistry , organic chemistry , pharmacology , amino acid , medicine , engineering , biology , microbiology and biotechnology
Chitosan at physiological pH lacks positive charge which reduces the mucoadhesivity and permeation enhancing capacity. Therefore glutamine conjugated chitosan (GC) was developed to enhance the protonation of chitosan at intestinal pH. Particles were prepared by sodium tripolyphosphate ionic crosslinking and were evaluated in vitro for its application toward oral insulin delivery. The particles had high positive charge of 35.6 ± 7.3 mV at physiological pH and a size of 4.434 μm. The mucoadhesive capacity was established in vitro using rat intestinal tissue. Transepithelial electrical resistance (TEER) and confocal microscopy studies proved the ability of the particles in opening the tight junctions in Caco 2 monolayers. The permeation of fluorescent dextran ( M W 4000; FD4) across intestinal tissue was evaluated using Franz diffusion apparatus. It was observed that the GC particles enhanced the permeation by 1.52 fold in comparison with native chitosan (NC) particles. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011.