Quality evaluation of Dokudami extract, a natural food additive

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  • 既存添加物ドクダミ抽出物の品質評価
  • キソン テンカブツ ドクダミ チュウシュツブツ ノ ヒンシツ ヒョウカ

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Abstract

Dokudami extract, a natural antioxidant agent used as a food additive, is described as a purified ethanol extract of leaves of Houttuynia cordata (Japanese name: Dokudami) and is composed mainly of isoquercitrin, in the Notice (1996) relating to the existing food additives used in Japan. In order to evaluate the quality of the Dokudami extract products, we have analyzed the two products by LC/MS. The results showed that quercitrin and hyperin were more major components than isoquercitrin. However, the Dokudami extract products were confirmed to be made from the leaves of H. cordata, because the compositions of the constituents in the products are similar to those in the extracts of the dried leaves of Houttuynia herba products ('Juuyaku' in Japanese) derived from H. cordata. The antioxidative activities of the food additive products were confirmed by detection of 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activities. These results are also useful for quality evaluation of not only Dokudami extract products as food additives but also various kinds of commercially available Dokudami products as food or folk medicines.

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