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KMID : 0604520140400040423
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Journal of the Society of Cosmetic Scientists of Korea
2014 Volume.40 No. 4 p.423 ~ p.430
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Antioxidant Activities of Ipomoea batatas L. Lam. (Purple Sweet Potato) Extracts Cultured in Korea
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Kong Bong-Ju
Han Sung-Soo
Ha Ji-Hoon
Park Soo-Nam
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Abstract
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In this study, the antioxidative effects for the extracts of purple sweet potato (Ipomoea batatas L. Lam.) were investigated. The purple sweet potato was extracted with 70% ethanol and the ethyl acetate fraction was obtained from the extracts. The yields of extract and ethyl acetate fraction were 39.2% and 3.49% per dried powder, respectively. To confirm the antioxidative effects of the extracts, free radical scavenging activities (1,1-diphenyl-2-picrylhydrazyl), total antioxidant capacity by luminol-dependent chemiluminescence assay and the protective effects against reactive oxygen species (ROS) in erythrocytes were measured. Free radical scavenging activities (FSC50) of the 70% ethanol extract and ethyl acetate fraction were 90.16μg/mL and 7.69μg/mL, respectively. The free radical scavenging activity of ethyl acetate fraction was higher than that of (+)-α-tocopherol (8.98μg/mL). Total antioxidant capacities (OSC50) of the 70% ethanol extract and ethyl acetate fraction were 5.75μg/mL and 1.92μg/mL, respectively. The capacity of ethyl acetate fraction was similar to L-ascorbic acid, known as a prominent water soluble antioxidant (1.50μg/mL). The cellular protective effects of the ethyl acetate fractions on the 1O2-induced cellular damage of human erythrocytes were increased in a concentration dependent manner (5∼50μg/mL). The τ50 value in 5μg/mL was 45.6 min which was higher than that of (+)-α-tocopherol in all concentrations. These results indicate that the ethyl acetate fraction of purple sweet potato (I. batatas) has the excellent antioxidative capacity and could be applicable to anti-aging cosmeceutical ingredients for skin aging inhibition.
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KEYWORD
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Ipomoea batatas L, Lam, , anthocyanin, antioxidant activity, DPPH
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