The cyanidin/peonidin group contains the largest number of
fruit varieties. Cyanidin glycosides and peonidin glycosides can
be metabolically converted to each other by methylation and
demethylation [10]. Both are also metabolized to protocatechuic
acid (PCA) and vanillic acid. Therefore, peonidin containing
fruits, such as cranberries and blackberries, are also classified
into the cyanidin/peonidin group.