Investigation of color-deepening phenomenon in catechin-(4→8)-dimer as a proanthocyanidin model and structural determination of its derivatives by oxidation.

@article{Hayashi2018InvestigationOC,
  title={Investigation of color-deepening phenomenon in catechin-(4→8)-dimer as a proanthocyanidin model and structural determination of its derivatives by oxidation.},
  author={Sakina Hayashi and Kohei Nakano and Emiko Yanase},
  journal={Food chemistry},
  year={2018},
  volume={239},
  pages={
          1126-1133
        }
}
To elucidate the mechanism of the color-deepening phenomenon in aged red rice samples, a partial structure of proanthocyanidin, (+)-catechin-(4→8)-dimer (1), was synthesized as a model compound and subjected to chemical oxidation. HPLC analysis of oxidized 1 revealed new peaks which were isolated; among these, four compounds (2-5) having formed intramolecular bonds between the D and B rings were determined. These compounds and their derivatives in red rice extracts were identified by multiple… CONTINUE READING
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