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http://dx.doi.org/10.11002/kjfp.2012.19.5.744

Antioxidant Activities of Extracts from Medicinal Plants  

Park, Hye-Jin (School of Applied Biosciences, Kyungpook National University)
Kang, Sun-Ae (School of Applied Biosciences, Kyungpook National University)
Lee, Ju-Yeong (School of Applied Biosciences, Kyungpook National University)
Cho, Young-Je (School of Food Science & Biotechnology, Food & Bio-Industry Research Institute, Kyungpook National University)
Publication Information
Food Science and Preservation / v.19, no.5, 2012 , pp. 744-750 More about this Journal
Abstract
In this study, the optimal conditions for phenolic-compound extraction from medicinal plants were found to be 24 h and about 50% ethanol. The electron-donating scavenging activities (DPPH), ABTS radical-cation decolorization (ABTS), antioxidant protection factor (PF), and thiobarbituric acid reaction substance (TBAR) were measured to determine the antioxidant activities of the extracts of Sanguisorba officinalis Linn., Citrus unshiu Markovich, Melia azedarach L., Asparagus cochinchinensis Merr., Citrus unshiu S., Polygonum aviculare L., and Leonurus sibiricus L. The total phenolic contents of the extracts of medical plants were determined to be 0.45-3.00 mg/g in the water extracts and 0.33-3.15 mg/g in the 50% ethanol extracts. The electron-donating abilities (EDA) of the water and ethanol extracts were both above 85% at the $50{\mu}g/ml$ concentration. The ABTS radical-cation decolorization was above 80% at the $100{\mu}g/ml$ concentration in all the extracts of various medicinal plants. The antioxidant protection factor (PF) of the Melia azedarach L. extracts was found to be $1.65{\pm}0.40$ PF in the water extracts at the $100{\mu}g/ml$ concentration, and was higher than those of the other medicinal-plant extracts. The TBAR inhibition rates of all the medicinal-plant extracts, except Asparagus cochinchinensis Merr., were above 85% at the $100{\mu}g/ml$ concentration. These results confirmed that the various oriental medicinal plants (Sanguisorba officinalis Linn., Citrus unshiu Markovich, Melia azedarach L., Asparagus cochinchinensis Merr., Citrus unshiu S., Polygonum aviculare L., and Leonurus sibiricus L.) that were included in this study are useful functional-food sources.
Keywords
Medicinal plant resource; extracts; phenolics; antioxidant activities;
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Times Cited By KSCI : 15  (Citation Analysis)
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