The impact of Rhizopus oryzae cultivation on rice bran: Gamma-oryzanol recovery and its antioxidant properties

摘要

This study evaluated the effect of the solid state cultivation (SSC) time of rice bran by Rhizopus oryzae on gamma-oryzanol recovery and its antioxidant properties. Gamma-oryzanol was extracted with organic solvents and its extracts were characterized by GC-FID and HPLC-UV. The antioxidant capacity was assessed by DPPH center dot and ABTS(center dot+) assays, beta-carotene/linoleic acid system, and reduction of oxidation in lipid system. The biomass showed the gamma-oryzanol recovery increased by 51.5% (20.52 mg/g), and 5.7% in polyunsaturated fatty acids. The gamma-oryzanol major components changing in their profile. The gamma-oryzanol extract from biomass (72 h) showed the greatest DPPH inhibition (59.0%), while 90.5% inhibition of oxidation of beta-carotene/linoleic acid system, and 30% reduction of the indicators of oxidation in olive oil was observed in the one cultivated at 96 h, these behaviors were confirmed by PCA analyses. SSC provides an increase in the gamma-oryzanol recovery followed by improving of the functional properties of rice bran. (C) 2017 Elsevier Ltd. All rights reserved.