1. Antioxidant activity of a ginger extract (Zingiber officinale)
- Author
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Stoilova, I., Krastanov, A., Stoyanova, A., Denev, P., and Gargova, S.
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ANTIOXIDANTS , *GINGER , *EXTRACTS , *EMULSIONS - Abstract
Abstract: The antioxidant effect and the total phenols of ginger extract were studied. The total phenols of the alcohol extract were found to be 870.1mg/g dry extract. 2,2-Diphenyl-1-picril hydrazyl radical (DPPH) scavenging reached 90.1% and exceeded that of butylated hydroxytoluene (BHT), the IC50 concentration for inhibition of DPPH was 0.64μg/ml. The antioxidant activity in a linoleic acid/water emulsion system determined by means of thiobarbituric acid reactive substances (TBARS) was highest at 37°C – 73.2%, and 71.6% when the formation of conjugated dienes was inhibited. At 80°C the antioxidant activity at the highest concentration of a ginger extract was less efficient: 65.7% for conjugated dienes formation and 68.2% for TBARS. The ginger extract inhibited the hydroxyl radicals 79.6% at 37°C and 74.8% at 80°C, which showed a higher antioxidant activity than quercetin. The IC50 concentration for inhibiting OH at 37°C was slower than that at 80°C – 1.90 and 2.78μg/ml, respectively. The ginger extract chelated Fe3+ in the solution. [Copyright &y& Elsevier]
- Published
- 2007
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