Studies on Polyphenolic Substances in Tubers of Eleocharis kuroguwai Ohwi, Cyperus serotinus Rottb. and Cyperus rotundus L.

Abstract

This investigation was conducted to determine the form and properties of polyphenolic substances present in the tubers of Eleocharis kuroguwai Ohwi, Cyperus serotinus Rottb. and Cyperus rotundus L. The results are summarized as follows:
(1) In tubers higher concentrations of polyphenolic substances were found in the cortical tissues, and the vascular bundle and its surrounding tissues.
(2) Polyphenol content in tubers of Cyperus serotinus Rottb. and Cyperus rotundus L. were higher than in tubers of Eleocharis kuroguwai Ohwi.
(3) Polyphenolic substances in tubers of the three species consisted primarily of catechol tannin of leucocyanidin, catechine and chlorogenic acid.
(4) The results suggested that the phenolic substances were present as individual monomers, higher polymers of each individual monomer, or as various mixed polymers of the three different phenolic substances.