In contrast, AD procedure of VI apple slices resulted in marked quercetin
glycoside degradation. The sum of quercetin derivatives was
reduced to 44% in comparison to FD. The highest degradation was
detected for quercetin-3-O-xyloside (59%) and the aglycone
(54%). Thus, the degradation reaction of the monoglycosidic
quercetin derivatives induced no quercetin aglycone accumulation.