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Title: Mechanistic study on hydration and drug release behavior of sodium alginate compacts
Authors: Chan, L.W. 
Ching, A.L.
Liew, C.V. 
Heng, P.W.S. 
Keywords: Alginate
Dimensional changes
Solvent penetration front
Issue Date: Jun-2007
Citation: Chan, L.W., Ching, A.L., Liew, C.V., Heng, P.W.S. (2007-06). Mechanistic study on hydration and drug release behavior of sodium alginate compacts. Drug Development and Industrial Pharmacy 33 (6) : 667-676. ScholarBank@NUS Repository.
Abstract: The influence of sodium alginate viscosity on the dynamics of matrix hydration, solvent front movement, swelling, erosion, and drug release from alginate matrix tablets were examined. The solvent front showed preferential penetration from the radial direction even though matrix swelling showed axial predominance. This study proposed alternative views for the anisotropic behavior of hydrating alginate compacts, namely, formation of gel barrier with different permeability characteristics, tension at the gel-core interface and preferential radial erosion, in addition to an in-depth examination on the contribution of stress relaxation of hydrated polymer as well as core expansion. Alginate matrices demonstrated pH-dependent hydration, swelling and erosion behavior, resulting in pH-dependent drug release mechanisms. Dissolution profiles for alginate matrices of different viscosities were similar in acid but differed upon increase of pH. This was due to the influence of alginate viscosity grade on liquid uptake, erosion and pronounced swelling at near neutral pH. Copyright © Informa Healthcare.
Source Title: Drug Development and Industrial Pharmacy
ISSN: 03639045
DOI: 10.1080/03639040600943814
Appears in Collections:Staff Publications

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