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ARS Home » Southeast Area » New Orleans, Louisiana » Southern Regional Research Center » Food Processing and Sensory Quality Research » Research » Publications at this Location » Publication #388709
Research Project: Nutritional Benefits of Health-Promoting Rice and Value-Added Foods

Location: Food Processing and Sensory Quality Research

Title: Purple and red rice (Oryza sativa L.) bran polyphenols exhibit antiobesity and antidiabetic activities

Author
item Boue, Stephen
item Watson, Michael

Submitted to: Cereal Chemistry
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/9/2024
Publication Date: 12/31/2024
Citation: Boue, S.M., Watson, M.A. 2024. Purple and red rice (Oryza sativa L.) bran polyphenols exhibit antiobesity and antidiabetic activities. Cereal Chemistry. https://doi.org/10.1002/cche.10861.
DOI: https://doi.org/10.1002/cche.10861

Interpretive Summary: Colored rice contains polyphenolic compounds that have antioxidant activity that are concentrated in the bran layer. In this study, we determined the total polyphenolic content and the ORAC antioxidant activities of six rice bran (1 brown, 3 red, and 2 purple) extracts. Each bran extract was evaluated for inhibitory effects on digestive enzyme activity. All purple and red bran extracts inhibited glucosidase enzyme activity, however only the red rice bran extracts inhibited 'amylase activity. In red rice bran, the highest enzyme inhibition was observed with the varieties Red Wells and Red Bhutan.

Technical Abstract: Pigmented rice contains polyphenolic compounds that have antioxidant activity that are concentrated in the bran layer. In this study, we determined the total polyphenolic content and the ORAC antioxidant activities of six rice bran (1 brown, 3 red, and 2 purple) extracts. Each bran extract was evaluated for inhibitory effects on 'alpha-amylase and 'alpha-glucosidase activity, two key enzymes required for starch digestion in humans. All purple and red bran extracts inhibited '-glucosidase activity, however only the red rice bran extracts inhibited alpha-amylase activity.In red rice bran, the highest enzyme inhibition was observed with the varieties Red Wells and Red Bhutan. The IC50 values for 'alpha-glucosidase inhibition for the five pigmented rice bran extracts correlated with the ORAC values obtained.