Journal
DRYING TECHNOLOGY
Volume 28, Issue 12, Pages 1396-1404Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/07373937.2010.482705
Keywords
Anthocyanin; Colorant; Microencapsulation; Sorption; Spray drying
Categories
Funding
- Council of Scientific and Industrial Research, New Delhi
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Microencapsulation of anthocyanin pigment present in Garcinia indica Choisy was carried out with maltodextrin of various dextrose equivalents (DE 06, 19, 21, and 33) and other additives such as gum acacia and tricalcium phosphate to enhance the stability of the pigment. The microencapsulated pigment containing 5.0% maltodextrin DE 21, 0.25% gum acacia, and 0.25% tricalcium phosphate was found to have lowest hygroscopic moisture content (4.38%), highest antioxidant activity (69.90%), and highest anthocyanin content (485mg/100g). The glass transition temperature was 44.59 degrees C. The sorption isotherms for microencapsulated powder showed that the samples were stable up to water activity less than 0.43. The scanning electron microscope structures depicted that the particle size ranged from 5 to 50m with smooth spheres. Storage at 4 degrees C increased the half-life twofold compared to that of the spray-dried product kept at ambient temperature (25 degrees C).
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