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http://dx.doi.org/10.11002/kjfp.2015.22.1.84

Physicochemical properties and protease activities of microencapsulated pineapple juice powders by spray drying process  

Park, Hye-Mi (Department of Food Science and Technology, Catholic University of Daegu)
Chae, Ho-Yong (Department of Food Science and Technology, Catholic University of Daegu)
Hong, Joo-Heon (Department of Food Science and Technology, Catholic University of Daegu)
Publication Information
Food Science and Preservation / v.22, no.1, 2015 , pp. 84-90 More about this Journal
Abstract
The physicochemical properties and protease activities of spray-dried pineapple juice powders were investigated. The pH, soluble solids, and protease activity of the pineapple juice were pH 5.43, $12.8^{\circ}Brix$, and 4.82 unit/mL, respectively. The optimum pH and temperature of the protease activity from pineapple juice were pH 7.0 and $50^{\circ}C$, respectively. The microencapsulation of pineapple juice was achieved using maltodextrin and alginic acid through spray-drying. The L value and moisture content of the spray-dried powder were higher than those of the freeze-dried powder. The particle size of the freeze-dried powder ($501.57{\mu}m$) was higher than that of the spray-dried powder ($42.58-53.32{\mu}m$). The water absorption and water solubility of the powders were 0.41-0.87, and 90.45-99.76%, respectively. When compared, the protease activities were found to be in the following order : FD (1,297.47 unit/g) > SD-MA-1 (692.08 unit/g) > SD-MA-2 (664.66 unit/g) > SD-MA-3 (642.65 unit/g) > SD-M (633.51 unit/g). In the in vitro dissolution study measurements were conducted for 4 hr in pH 1.2 simulated gastric fluid and pH 6.8 simulated intestinal fluid, using a dissolution tester at $37^{\circ}C$ in 50 rpm. The protease survival of the 3.74-15.69% microencapsulated pineapple juice powders improved with an increase in the treatment concentration of alginic acid.
Keywords
pineapple; spray drying; microencapsulation; protease activities; physicochemical properties;
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Times Cited By KSCI : 14  (Citation Analysis)
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