Figure 1. Representative chromatogram of Grape skin extract (GSE) (A). Anthocyanins content of GSE was determined by linear regression from the calibration graph of delphinidin-3-glucoside and malvidin-3,5-diglucoside. We determined that GSE contain (1) delphinidin-3-glucoside (B) and (2) malvidin-3,5-diglucoside (C). (D) Average contents of delphinidin-3-glucoside and malvidin-3,5-diglucoside in Grape skin extract (GSE).