Abstract

본 연구에서는 한약 재료로 널리 이용되고 있는 3종의 약용식물(지치, 창이자, 인동초)을 기능성 소재로 이용하기 위하여 총 페놀함량, DPPH radical 소거능, xanthine oxidase 저해능 등의 실험을 통해 한약재의 항산화 활성을 살펴보았다. 지치, 창이자, 인동초의 수율은 각 7.01%, 2.92%, 7.95%, 총 페놀함량은 각 <TEX>$4.3{\pm}0.1{\mu}g/ml$</TEX>, <TEX>$5.4{\pm}0.1{\mu}g/ml$</TEX>, <TEX>$4.6{\pm}0.1{\mu}g/ml$</TEX>를 함유하고 있었다. DPPH radical 소거능은 인동초가 0.24 mg/ml에서 <TEX>$EC_{50}$</TEX>이 나타났으며 나머지 2종 모두 높은 DPPH radical 소거능을 보였다. Xanthine oxidase 저해능은 0.01 mg/ml의 농도에서 한약재 3종 모두 대조구로 사용된 ascorbic acid보다 더 높은 저해 활성을 나타내었다. 그 외에도 Superoxide radical 소거활성은 지치와 인동초가 50 mg/ml의 농도에서 80% 이상의 소거활성을 보였으며, OH radical 소거활성은 50 mg/ml의 농도에서 40% 이상의 소거활성이 나타났다. 이상의 결과로부터 지치, 창이자, 인동초 모두 높은 항산화 활성을 가지고 있으며, 기능성 소재로 활용 가능함을 확인하였다. In this study, we examined the antioxidative activities of ethanol extracts obtained from three plants; Lithospermum erythrorhizon Siebold & Zucc., Xanthium strumarium Linn, and Lonicera japonica, which have traditionally been used as drugs in Eastern medicine in Korea. Their extraction yields were 7.01%, 2.92%, and 7.95% in Lithospermum erythrorhizon Siebold & Zucc., Xanthium strumarium L, and Lonicera japonica, respectively. The contents of the phenolic compounds were <TEX>$4.3{\pm}0.1{\mu}g/ml$</TEX>, <TEX>$5.4{\pm}0.1{\mu}g/ml$</TEX>, and <TEX>$4.6{\pm}0.1{\mu}g/ml$</TEX> in Lithospermum erythrorhizon Siebold & Zucc., and Xanthium strumarium L, respectively. Furthermore, the radical scavenging activity measured through the DPPH assay appeared highest in the Lonicera japonica's extract, and its <TEX>$EC_{50}$</TEX> was 0.24 mg/ml. Compared to the control, the xanthine oxidase inhibiting activities of all extracts were effective at 0.01 mg/ml concentration. Superoxide radical scavenging activity in Lithospermum erythrorhizon Siebold & Zucc. and Lonicera japonica was more than 80%, with a concentration of 50 mg/ml. OH radical scavenging activity was 40% in the three plants, with a concentration of 50 mg/ml scavenging activity. From our results, we demonstrated that the ethanol extracts of three medicinal plants have antioxidant activities and could be potential candidates for natural antioxidants.

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