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dc.contributor.authorVaraporn Buraphacheep Junyapraserten_US
dc.contributor.authorAmpol Mitrevejen_US
dc.contributor.authorNuttanan Sinchaipaniden_US
dc.contributor.authorPrapaporn Boonmeen_US
dc.contributor.authorDale Eric Wursteren_US
dc.contributor.otherMahidol Universityen_US
dc.contributor.otherPrince of Songkla Universityen_US
dc.contributor.otherUniversity of Iowaen_US
dc.identifier.citationDrug Development and Industrial Pharmacy. Vol.27, No.6 (2001), 561-566en_US
dc.description.abstractMicrocapsules of vitamin A palmitate were prepared by gelatin-acacia complex coacervation. The effects of colloid mixing ratio, core-to-wall ratio, hardening agent, concentration of core solution, and drying method on the coacervation process and the properties of the microcapsules were investigated. The microcapsules of vitamin A palmitate were prepared using different weight ratios of gelatin and acacia, that is, 2:3, 1:1, and 3:2 under controlled conditions. The other factors studied were 1:1, 1:2, and 1:3 core-to-wall ratios; 30, 60, and 120 min of hardening time; 2, 5, and 10 ml of formaldehyde per 280 g of coacervation system as a hardening agent; and 30%, 40%, and 50% w/w vitamin A palmitate in corn oil as a core material. The drying methods used were air drying, hot air at 40°C, and freezedrying. The results showed that spherical microcapsules were obtained for all conditions except for 30 min of hardening time, which did not result in microcapsules. The optimum conditions for free-flowing microcapsules with a high percentage of entrapped drug were 1:1 gelatin-to-acacia ratio and 1:2 core-to-wall ratio when hardening with 2 ml formaldehyde for 60 min and using 40% w/w vitamin A palmitate in corn oil as the core concentration. In addition, drying the microcapsules by freeze-drying provided microcapsules with excellent appearance.en_US
dc.rightsMahidol Universityen_US
dc.subjectBiochemistry, Genetics and Molecular Biologyen_US
dc.subjectPharmacology, Toxicology and Pharmaceuticsen_US
dc.titleEffect of process variables on the microencapsulation of vitamin A palmitate by gelatin-acacia coacervationen_US
Appears in Collections:Scopus 2001-2005

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