Comparison of the Constitutions, Distribution, and Antioxidant Activities of Polyphenols from Different Varieties of Tartary Buckwheat Seed Produced from Different Regions of China

Objective) The constitution, content and distribution of polyphenols in hull, bran, flour and whole grain of different varieties of tartary buckwheats from different regions of China were studied. The antioxidant activities of polyphenol extracts from different parts and samples of tartary buckwheat were compared. The aim of the study is to obtain the scientific data for improvement of tartary buckwheat breeding and further processing. (Method) Total phenolic contents (TPCs) of hull, bran, flour and whole grain of 17 varieties of tartary buckwheat were firstly compared by Folin-Ciocalteu reagent method. The polyphenol constitutions and individual phenolics content were analyzed by HPLC coupled with mass spectrometry (HPLC/MS) and tandem MS (MS/MS). The antioxidant activities of different polyphenol extracts were compared by DPPH and ORAC methods. (Result) Both