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. 2020 Sep 11;15:98. doi: 10.1186/s13020-020-00379-x

Fig. 2.

Fig. 2

Chromatographic analysis of flavonoids. Representative chromatograms of calycosin-7-O-β-D-glucoside, ononin, formononetin and calycosin under a Blank matrix; b Blank matrix spiked with the four analytes LLOQ; and c The products at 6 h of fermentation