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KMID : 1160620040090040289
Preventive Nutrition and Food Science
2004 Volume.9 No. 4 p.289 ~ p.294
Antioxidant Activity of Salad Vegetables Grown in Korea
Xin Zao

Song Kyung-Bin
Kim Mee-Ree
Abstract
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.
KEYWORD
salad vegetables, antioxidant activities, total phenolics
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