The anthocyanins are differentiated from one another by the
number and position of hydroxyl and/or methyl groups and by the
nature, number, position and acylation of the sugars present in
their structure. Due to this enormous variety, there are reports of
more than 500 anthocyanins and 23 anthocyanidins, of which only
6 are frequently found distributed in nature and in foods: cyanidin
(50%), delphinidin, pelargonidin and peonidin (12%) and petunidin
and malvidin (7%) (Castan ˜eda-Ovando et al., 2009).