Hydrolyzing Study of Anthocyanins from Purple Sweet Potato

Purple sweet potato is rich of anthocyanidins in the form of acylated anthocyanins.There are more than 20 anthocyanins in purple sweet potato,thus they are difficult to be directly quantitatively determined.Herein the extraction and hydrolysis of anthocyanidins in purple sweet potato were combined for the first time: after extracted under the ultrasonic irradiation with HCL aqueous solution the anthocyanins were directly hydrolyzed in burning water and converted into anthocyanidins.13 purple sweet potato come from local market of Sichuan province of China were qualitatively analyzed via this method,and the majority of anthocyanidins are cyanidin and peonidin in all of the species analyzed.The method is facile and robust,which should be able to routinely determine the anthocyanidins in purple sweet potato and other plants.