*3.1.2.2. Flavonols and proanthocyanidins*

In the grain of blue maize, derivatives from quercetin have been reported [27], while in the grain of purple maize, in addition to these derivatives, morin and kaempferol have also been identified and quantified [14]. These flavonols have not been reported in white maize grain, whereas in yellow maize grain, quercetin and kaempferol have been reported to be present in trace amounts [13]. Within the group of proanthocyanidins, only catechin has been reported to be present in the blue maize grain of Mexican and American origins [27].
