Lee SJ, Rosenberg M. Preparation and properties of glutaraldehyde cross-linked whey protein-based microcapsules containing theophylline.
J Control Release 1999;
61:123-36. [PMID:
10469909 DOI:
10.1016/s0168-3659(99)00108-x]
[Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Whey protein-based microcapsules containing a model drug, theophylline, were prepared in organic phase, using glutaraldehyde-saturated toluene. In all cases, spherical microcapsules, ranging from <400 to 1000 microm in diameter, were obtained. Results indicated that core crystals were embedded throughout the wall matrix. In all cases, retention efficiency of theophylline was higher than 74% and was not affected by cross-linking conditions. Results of theophylline release in simulated intestinal and gastric fluids at 37 degrees C indicated that the diffusion-governed core release was significantly affected by size of microcapsules, cross-linking conditions, and by type of dissolution medium. In all cases, core release in simulated intestinal fluid was faster than in simulated gastric fluid.
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