Analysis of Proanthocyanidins in Grape Seed Extracts , Health Foods and Grape Seed Oils

  title={Analysis of Proanthocyanidins in Grape Seed Extracts , Health Foods and Grape Seed Oils},
  author={Yumiko Nakamura and Sumiko Tsuji and Yasuhide Tonogai},
Grape seed extract (GSE) is one of Japan's natural food additives, and is recommended for use as an antioxidant. The component of interest is polyphenol, mainly proanthocyanidins, which are condensed tannins. A vanillin-hydrochloric acid (HCl) assay is specific for flavan-3-ol. The sensitivity of GSE components to the vanillin-HCl assay differed according to the chemical structure. We applied this assay to the determination of proanthocyanidin content in GSEs, health foods containing GSEs and… CONTINUE READING


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