The effect of parboiling temperature on polyphenols should be
considered because parboiling is a thermal process. Several studies
have demonstrated that phenolic compounds from different foods
suffer decomposition under high temperatures, and this effect depends
on the temperature, time of processing, type of compounds in
the sample and other conditions (Larrauri, Rupres, & Saura-Calixto,
1997; Piga, Del Caro, & Corda, 2003). This decomposition results in
the reduction of the polyphenol concentration, as observed in the
present work for parboiled grains.