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http://dx.doi.org/10.11002/kjfp.2015.22.4.591

Antioxidant activities of chlorella extracts and physicochemical characteristics of spray-dried chlorella powders  

Lee, Dae-Hoon (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.4, 2015 , pp. 591-597 More about this Journal
Abstract
In this study, extracts of chlorella using different extraction methods were compared for antioxidant activities and spray-dried chlorella powders were investigated for their physicochemical characteristics. The DPPH radical scavenging activity and superoxide radical scavenging activity of 50% ethanol extract were 29.19%, and 48.91%, respectively. The oxygen radical absorbance capacity (ORAC) of the 50% ethanol extract ($150.44{\mu}M/g$) was higher than those of other extracts. The total chlorophyll content of the 50% ethanol extract (542.89 mg/100 g) was higher than those of other extracts. The microencapsulation of the 50% ethanol extract was manufactured by spray-drying with 10 % maltodextrin (SD-C10), 20% maltodextrin (SD-C20), and 30% maltodextrin (SD-C30). The particle size of the freeze-dried powder ($454.47{\mu}m$) was higher than those of the spray-dried powders ($24.15{\sim}32.49{\mu}m$). Scanning electron microscope images showed that the spray-dried chlorella powders using SD-C10, SD-C20, and SD-C30 had an uniform particle distribution. The water absorption index and water solubility index (WSI) of powders were 0.31~0.45, and 96.96~98.28%, respectively. The spray-dried powders showed the stability in total chlorophyll content for 40 days storage. Based on these results, spray-dried chlorella powders could be used in various types of food processes.
Keywords
chlorella; spray drying; microencapsulation; physicochemical characteristics; antioxidant activities;
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Times Cited By KSCI : 16  (Citation Analysis)
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