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Hot Water Extraction Optimization of Dandelion Leaves to Increase Antioxidant Activity  

Koh, Yoon-Jeoung (Korea Food Research Institute)
Cha, Dong-Su (BioCoats)
Choi, Hee-Don (Korea Food Research Institute)
Park, Yong-Kon (Korea Food Research Institute)
Choi, In-Wook (Korea Food Research Institute)
Publication Information
Korean Journal of Food Science and Technology / v.40, no.3, 2008 , pp. 283-289 More about this Journal
Abstract
This study used response surface methodology (RSM) in an effort to optimize the hot water extraction conditions of dandelion leaves in order to increase antioxidant activity in the extract. A central composite design was applied to investigate the effects of independent variables, which included the ratio of solvent to sample ($X_1$), extraction temperature ($X_2$), and extraction time ($X_3$), on dependent variables of the extracts, including soluble solid ($Y_1$), total polyphenols ($Y_2$), total flavonoid ($Y_3$), 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging ability ($Y_4$), 2,2'-azino-bis (3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) radical scavenging ability ($Y_5$), and superoxide radical scavenging ability ($Y_6$). The estimated optimal conditions were as follows: $83.77{\pm}1.07^{\circ}C$ of the extraction temperature, $20.85{\pm}0.24 mL/g$ of solvent per sample, and $1.59{\pm}0.12$ hr of extraction time. At the optimal conditions, the predicted characteristic values were: a yield of 38.98%, a total polyphenol level of $74.28{\mu}g/mg$, a total flavonoid level of $74.00{\mu}g/mg$, a DPPH radical scavenging ability ($IC_{50}$) of 0.14 mg/mL, a ABTS radical scavenging ability ($IC_{50}$) of 3.24 mg/mL, and a superoxide radical scavenging ability ($IC_{50}$) of 2.49 mg/mL.
Keywords
dandelion leaves; RSM; antioxidant activity; DPPH; ABTS; superoxide;
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Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By SCOPUS : 2
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