The solid-state fermentation (SSF) has been employed as a form making available a higher content of
functional compounds from agroindustrial wastes. In this work, the effect of SSF with the Rhizopus oryzae
fungus on the phenolic acid content of rice bran was studied. Phenolic extracts derived from rice bran and
fermented rice bran were evaluated for their ability to reduce free radical 1,1-diphenyl-2-picrihidrazil
(DPPH) and for the ability to inhibit the enzymes peroxidase and polyphenol oxidase. The phenolic compound
content increased by more than two times with fermentation. A change in the content of phenolic
acids was observed, with ferulic acid presenting the greatest increase with the fermentation, starting
from 33 mg/g in rice bran and reaching 765 mg/g in the fermented bran. The phenolic extracts showed
an inhibition potential for DPPH and for the peroxidase enzyme, however did not inhibit the polyphenol
oxidase enzyme.