They occur primarily as glycosides or acylglycosides of their respective aglycone anthocyanidins. There are almost seventeen natural anthocyanidins; however, only 6 of them, cyanidin, delphinidin, petunidin, peonidin, pelargonidin, and malvidin are universally distributed [3]. Over 600 naturally occurring ACNs have been reported differing in (a) the number and position of hydroxyl and methoxyl ...
