Antioxidant activity of fractions obtained from germinated brown rice and brown rice

Abstract

Germinated brown rice (GBR) has been considered a “magic medicine” in Vietnam which can cure or treat a lot of diseases. Therefore, it has been sold at very high prices. To examine the practical value of GBR on human health compared with brown rice (BR), the study related to comparing biological activities of GBR fractions and BR fractions has been conducted. In this paper, the results of their antioxidant activity were shown and discussed. The results revealed that total polyphenolic content in H2O fraction of BR was four times higher than that of GBR, and in hexane and chloroform fractions, the differences between BR and GBR were not considerable at p < 0.05. Moreover, ethyl acetate fraction of GBR has highest DPPH scavenging activity, followed by ethyl acetate and chloroform fractions of BR (over 50%). In ABTS and reducing power assays, the inhibitory activity of chloroform fraction of BR was the highest, significantly different from the others (p < 0.05). Briefly, the total polyphenols and antioxidant activity of some fractions of BR were higher than those of GBR.