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지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
Abstract Tung oil contains approximately 78% α -eleostearic acid (9 c , 11 t , 13 t -octadecatrienoic acid), 9% linoleic acid, and 7% oleic acid. This oil is easily oxidized because of the three conjugated double bonds in α -eleostearic acid; however, it is stable within the tung seed. Previously, we isolated and identified a catechol-type lignan and neolignans from tung seeds, which exhibited potent antioxidant activity. Catechol compounds were specifically present in the seed coat of tung trees. In this study, we quantified the catechol-type lignans in the seed coat of Euphorbiaceae oil-producing plants and found that the plant seeds containing easily oxidized fatty acids contained higher amounts of catechol-type lignans in their seed coat. The antioxidant activity assay of phenolic compounds indicated that catechol-type compounds have higher antioxidant activity than monophenol-type compounds, and that the two hydroxy groups in the ortho -position of the benzene ring are important for enhancing antioxidant activity. Analysis of the antioxidant mechanism by 13 C nuclear magnetic resonance ( 13 C NMR) spectroscopy showed that isoamericanol A captured the 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical and preferentially changed it to the quinone structure. The oil oxidation inhibition test revealed that α -tocopherol inefficiently inhibited the oxidation of tung oil, and that catechol compounds with a higher antioxidative activity than α -tocopherol would be required to prevent the oxidation of tung oil. These results show that tung seeds synthesize catechol-type lignans in the seed coat to prevent the oxidation of tung oil in the endosperm.
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