Comparative Analysis of γ-Oryzanol, β-Glucan, Total Phenolic Content and Antioxidant Activity in Fermented Rice Bran of Different Varieties

Abstract

Rice bran, a by-product derived from processing rice, is a rich source of bioactive compounds. Recent studies have suggested that the fermentation can improve their biological activities. This study aimed to determined the level of γ-oryzanol, β-glucan and total phenol contents of fermented rice bran from 21 Korean varieties, as well as to evaluate their antioxidant activities. We also assessed the validation of the analytical method for determining γ-oryzanol content in fermented rice brans. Among the fermented rice brans, the Haedam rice bran contained the highest level of total phenol content (156.08 mg gallic acid equivalents/g), DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging activity (71.30%) and ORAC (Oxygen radical absorbance capacity) value (1101.31 μM trolox equivalents/g). Furthermore, the fermented Migwang rice bran showed the highest level of γ-oryzanol content (294.77 ± 6.74 mg/100 g).

Exploiting the bioactive properties of γ-oryzanol from bran of different exotic rice varieties

“…NSICR9 exhibit higher predominance of 24-MCAF and Maçarico and Ceres present higher amounts of CampF when compared with the remaining varieties. The concentrations obtained for γoryzanol are within the range found in the literature (79.2 to 912 mg/100 g) 13,16,17,[33][34][35] . Lower concentrations obtained can be related with the extraction techniques and quantification with different temperatures and solvents, which may affect not only the lipid yield 36 but also the γ-oryzanol content 11,12,16,37 .…”

Rice bran fermentation by lactic acid bacteria to enhance antioxidant activities and increase the ferulic acid, ρ-coumaric acid, and γ-oryzanol content

“…Rice bran fermented with Lactobacillus fermentum MJM60393 showed the highest (88.64%) DPPH free radical scavenging activity, which was more than 1.2-fold that of the non-fermented rice bran (75.55%). The DPPH radical scavenging activities determined in our study are similar to those of most fermented rice brans [32]. In fact, the DPPH radical scavenging activity showed a strong correlation with phenolic compounds [33].…”

Effect of dietary supplementation with <i>Rhizopus oryzae</i> or <i>Chrysonilia crassa</i> on growth performance, blood profile, intestinal microbial population, and carcass traits in broilers exposed to heat stress

“…Although we did not measure corticosterone in this study, it is likely that probiotics (in the fungal supplements) and prebiotics (in untreated rice bran) reversed the increased level of corticosterone in HS birds (Sohail et al, 2012). Moreover, the antioxidant capacities in fungi (according to the data above) and rice bran (Jung et al, 2017) may also help to ameliorate oxidative stress, and hence the increased level of corticosterone and tissue atrophy in chickens could be prevented (Lin et al, 2004). In the present study, treatments with the fungi or rice bran were associated with the improved antioxidant status and, possibly, the decreased corticosterone level in birds.…”

“…In addition to prebiotics, rice bran has been reported to exhibit antioxidant activity (Jung et al, 2017). In this regard, rice bran supplementation seemed beneficial in alleviating the adverse effects of HS in broilers.…”