Screening of phytochemical compounds and antioxidant properties in local and HYV of Bangladeshi Rice (Oryza sativa L.)

Abstract

Naturally occurring antioxidant supplements from plants are vital to counter the oxidative damage in cells where consumption of whole grain plays a vital role. As a dietary supplement, antioxidant activities of five local and HYV rice (Kalijira, Chinigura, Hizoldigha, BRRI dhan28, BRRI dhan29) of Bangladesh were examined through DPPH antioxidant assay. Methanol extract of bran, polished and unpolished grain of each genotype were used as a studied sample. Studied sample showed significant antioxidant activity. Where bran is more potent part of rice showed higher antioxidant properties compeering unpolished and polished grain. Unpolished grain also showed greatest result where polished grain showed less performance. Among different genotypes Kalijira bran is black in color and showed better scavenging activity with the IC50 value of 60.12 μg/ml. Hizoldigha unpolished grain is red in color and showed higher antioxidant properties (130.2 μg/ml) compeering other unpolished grain. IC50 value of the positive control as BHT was 37.35 μg/ml. The result of present investigation denotes that the studied genotypes possess moderate antioxidant activity where Kalijira bran bear high antioxidant compound and keep demand to more processing and recently is using for extracting edible oil commonly called as rice bran oil. Unconventional Hizoldigha grain also contain high antioxidant activity and can be considered as nutraceutical foods as staple food.