고구마 품종별 수확시기 잎의 저분자항산화물질 함량분석
Contents of low molecular weight antioxidants in the leaves of different sweetpotato cultivars at harvest
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참고문헌
초록
고구마는 폴리페놀, 안토시아닌, 카로티노이드등의 저 분자항산화물질 함량이 다른 작물에 비해 높아 기능성식 품으로 이용되고 있다. 본 연구에서는 고구마 잎을 기능 성 사료작물로 개발하고자 수확시기 고구마 14품종 잎을 대상으로 DPPH 라디칼 소거활성 및 폴리페놀, 카로티노 이드, 안토시아닌의 함량을 조사하였다. DPPH 라디칼 소 거활성 조사결과 Nanjing 9, Yulmi, Shinzami 품종이 높은 활성을 보였으며 Huiza 6 품종이 가장 낮은 활성을 보였 다. 안토시아닌 함량은 Shinzami 품종이 가장 많았고, 폴 리페놀은 Shinhwangmi 품종이 가장 많았으나 그 차이는 크지 않았다. 또한 저장뿌리에서 안토시아닌, 카로티노 이드와 같은 천연색소 함량이 높은 품종이 잎에서의 항 산화 활성도 높게 나타났다. 본 연구에서 조사한 고구마 잎의 저분자항산화물질의 함량이 전반적으로 높고 품종 별 차이가 크지 않은 것으로 조사되어 수확 후 버려지는 지상부가 품종에 관계없이 기능성 사료나 항산화물질의 추출재료로 사용 가능함이 제시되었다.
Abstract
Sweetpotato [Ipomoea batatas (L.) Lam] leaves are excellent source of low molecular weight antioxidants such as polyphenols, anthocyanins and carotenoids compared to other leafy vegetables. Endogenous antioxidants in sweetpotato help our bodies to prevent ageing, heart diseases and cancer. In this study, to develop the proper cultivars for the functional feed materials, we investigated the contents of anthocyanin, β-carotene, and polyphenols as well as DPPH radical scavenging activity in leaves of 14 different cultivars at the time of the harvest. They showed a diverse antioxidation activity. In DPPH radical scavenging activity, cultivars of Nanjing 9, Yulmi and Shinzami showed higher activity, whereas cv. Huiza 6 showed the lowest. Cultivars of Shinzami and Shinhwangmi had the highest anthocyanin (3.5 mg/g fr wt) and polyphenol (15.8 mg/g fr wt) content, respectively. Interestingly, there was a high correlation between cultivars with colorful pigments in storage roots and antioxidants activity in leaves. These results suggest that sweetpotato leaves with high antioxidant activity at harvest would be suitable for functional feed materials.
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