Radical Scavenging Activity of Polyphenols in Young Leaves of Sesamum indicum L.

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  • ゴマ若葉に含まれるポリフェノール成分のラジカル消去活性
  • ゴマ ワカバ ニ フクマレル ポリフェノール セイブン ノ ラジカル ショウキョ カッセイ
  • Radical scavenging activity of polyphenols in young leaves of <italic>Sesamum indicum</italic> L

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Abstract

Antioxidant activities of young sesame leaves (Sesamum indicum L.) were measured using 3 different radical scavenging methods (DPPH, ABTS, and superoxide anion radicals). The activities of young sesame leaves in any of the methods were higher than those of barley and kale, while mulberry leaves had the highest activity. The activities were dependent on the polyphenol content in samples (mulberry, 15.9 ; sesame, 9.39 ; kale, 3.61 ; barley, 2.04mg-gallic acid equivalent/g-dry weight). However, when antioxidant activities per weight of polyphenol were estimated, the young sesame leaves showed the same or higher antioxidant activity than mulberry leaves, suggesting that young sesame leaves would contain strong antioxidative phenolic compounds. Next, when young sesame leaf extract was applied to an HPLC-DPPH online post-column system, nine peaks (S1∼S9) appeared in the UV chromatogram at 340nm, and HPLC-separated components corresponding to peaks S4, S5, S6 and S8 reacted with DPPH. This result suggests that these are the major antioxidative components in young sesame leaves. From the results of several chromatographic purifications, about 1.4kg of young sesame leaf powder yielded 524mg of compound S5. The MS and NMR analyses revealed that S5 was acteoside, a phenylpropanoid glycoside. The acteoside content in young sesame leaf powder was 1.2%.

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