Fig. 6

Optimization of the bioconversion product separation and purification process and identification of the conversion product structure. Gradient HPLC was used for the detection of flavonol glycoside standards (A) and bioconversion products (B). Separation of the conversion products (C) and separation process optimization (D) by equi-HPLC. Stability verification of the purification process (E) and mass spectrum analysis of the purification products (F)