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Sweet potato (Ipomoea batatas L.) is mainly cultivated in Asia. The deep purple color of purple sweet potato (PSP) is due to the high content of acylated anthocyanins. In the present study, PSP-derived polyphenols were identified using HPLC-PDA and HPLC-ESI-MSn analyses. After concentration of the polyphenols from PSP, preparative separation into two fractions, designated anthocyanins (AF) and copigments...
A liquid chromatographic method with a coulometric electrochemical detector (ECD) and a fused-core column was developed for the quantification of the olive oil phenolics tyrosol, hydroxytyrosol, oleuropein, pinoresinol, and caffeic, ferulic, vanillic, and p-coumaric acid. The method was validated according to guidelines of the U.S. Food and Drug Administration. The selectivity, linearity, lower limit...
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