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http://dx.doi.org/10.3746/jkfn.2015.44.5.695

Effect of Drying and Extraction Methods on Antioxidant Activity of Gnaphalium affine D. DON  

Kim, Hye-Jin (Department of Food and Nutrition, Kwangju Women's University)
Park, Byung-Geon (Department of Food and Nutrition, Kwangju Women's University)
Han, Inhwa (Department of Food and Nutrition, Kwangju Women's University)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.44, no.5, 2015 , pp. 695-701 More about this Journal
Abstract
This study was conducted to evaluate the effects of drying and extraction methods on antioxidant activity and total phenol content of Gnaphalium affine D. DON (GA). Hot-air, shade-drying, and freeze-drying were used for drying, after which magnetic stirring and ultrasonification were applied. Extracting solvents were water, 80% ethanol, and 80% methanol. Total phenol content was highest in 80% ethanol extract of freeze-dried and stirred GA. Total flavonoid content was highest in 80% methanol extract of freeze-dried and stirred GA. 2,2-Diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity was higher in 80% methanol and 80% ethanol extracts than in water extract. 2,2-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) radical scavenging activity was highest in 80% ethanol extract of shade-dried and ultrasonicated GA. Reducing power was generally higher in 80% methanol extract than in 80% ethanol and water extracts of GA. Total phenol and total flavonoid contents were highly correlated with DPPH radical scavenging activity and reducing power, respectively. This result implies that the antioxidant activity of GA can be attributed to phenol compounds such as flavonoids. Conclusively, phenol compounds such as flavonoids are responsible for the antioxidant activity of GA, and there was no significant effect of drying and stirring conditions on antioxidant activity of 80% ethanol. Meanwhile, DPPH radical scavenging activity of water extract and reducing power of 80% methanol extract were higher in hot-air and shade-dried GAs than in freeze-dried GA.
Keywords
Gnaphalium affine D. DON; drying method; antioxidant activity; total phenol content; total flavonoid content;
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