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KMID : 1160620040090040289
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Preventive Nutrition and Food Science
2004 Volume.9 No. 4 p.289 ~ p.294
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Antioxidant Activity of Salad Vegetables Grown in Korea
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Xin Zao
Song Kyung-Bin
Kim Mee-Ree
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Abstract
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The antioxidant activity of forty two kinds of salad vegetables grown in Korea was evaluated. Methanol extract of freeze-dried vegetable was assayed by radical scavenging activity using 1,2-diphenyl-2-picrylhydrazyl (DPPH) and Fe^{2+}$-catalyzed lipid peroxidation inhibition by TBA method. Total phenolics were determined colorimetrically using Folin-Ciocalteu reagent. The highest radical scavenging activity was expressed by perilla leaf, followed by dandelion leaf, red and green leafy lettuce, of which IC50 was less than 0.10 mg/mL. Angelica leaf showed the highest inhibitory action for lipid peroxidation with 95%, and then dandelion leaf, water spinach, and perilla leaf inhibited over 80%. However, lettuce (Iceberg) and young Chinese cabbage exhibited the lowest antioxidant activity based on both assay methods. Highly positive correlations between antioxidative activities and total phenolics were observed (p < 0.001). The results suggested that salad vegetables, especially perilla leaf, leafy lettuce, dandelion or angelica, could be used for easily accessible sources of natural antioxidants.
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KEYWORD
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salad vegetables, antioxidant activities, total phenolics
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