Thermal treatment could reduce nutritional values of black rice
by chemical reactions. In current research, the negative relationship
between cooking period and contents of bioactive substances
(including TPC, TFC, CTC, anthocyanin content and antioxidants),
were investigated. The results indicated that through heat treatment,
it can decrease these bioactive compounds significantly
(p < 0.05). In addition, two thermal processing triggered different
values of those functional compounds. In details, black rice porridge
can retain much more antioxidants (such as phenolics). Therefore,
to maintain bioavailability of active components, rice porridge as
the form of cooking black rice may gain more health promoting
effects. Black rice is always needed to cook before consumption.
In other words, we cannot obtain all bioactive compounds in raw
black rice, because of thermal degradation of phenolic substances