Microwave cooking drastically decreased anthocyanin and phenolic
content, as well as antioxidant activities. Degradation of
major anthocyanins, cy-3-glu and pn-3-glu, of cooked purple rice
resulted in an increase in the free phenolic acids, PCA and VA.
Microwave-cooked rice showed the lowest anthocyanin and phenolic
content as well as antiproliferative activity. Rice cooked
under sterilization exhibited the highest extractable PCA and the
highest antiproliferative effects on the undifferentiated Caco-2
cells, comparable to that of raw rice. The primary bioactive compound
of raw rice was the anthocyanins, whereas in autoclavecooked
rice, it was the phenolic acids. PCA was likely to be one
of important compounds contributing to high antioxidant and
antiproliferative activity of autoclaved rice.