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Antioxidant activities and phenolic compounds of pigmented rice bran extracts.
J Food Sci. 2012 Jul; 77(7):C759-64.JF

Abstract

This study was carried out to investigate the antioxidant activities and phenolic compounds of pigmented rice (black, red, and green rice) and brown rice brans. Antioxidant activity was determined by using 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical assay, 2,2-azino-bis-(3-ethylenebenzothiozoline-6-sulfonic acid) (ABTS) radical cation assay, reducing power, and chelating ability. Phenolic compounds were measured by using HPLC. Pigmented rice brans were extracted by using aqueous mixtures of acetone, ethanol, and methanol to determine the most effective extraction solvent. Of all solvents examined, extract from 40:60 acetone-water mixtures (v/v) provided the highest DPPH radical assay as well as the highest total phenolic and flavonoid content. We finally selected 40% acetone as an extraction solvent for antioxidant study of pigmented rice bran. Antioxidant activities of 40% acetone extracts of pigmented rice bran, measured in the range of 0 to 1500 μg/mL. At 500 μg/mL concentration, red rice bran, which had the highest total phenolic (259.5 μg/mg) and total flavonoid (187.4 μg/mg) contents, showed the highest antioxidant activity: 83.6%, 71.5%, 1.2%, and 16.4% for DPPH radical assay, ABTS radical cation assay, reducing power, and chelating ability, respectively. Red rice bran showed a lower EC(50) value (112.6 μg/mL) than that of butylated hydroxytoluene (144.5 μg/mL) from the DPPH radical assay. The major phenolic acids of red rice bran were ferulic, vanillic and p-coumaric acids. The results indicated pigmented rice bran might be used as a natural antioxidant.

PRACTICAL APPLICATION

The present study revealed black and red rice bran shows high antioxidant activities and they contain high amount of phenolic compounds. Indeed, black and red rice bran could be better raw materials for manufacturing the food with high antioxidant activity.

Authors+Show Affiliations

Dept of Food Science & Technology, Chonbuk Natl Univ, Jeonju 561-756, Korea.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

22708681

Citation

Jun, Hyun-Il, et al. "Antioxidant Activities and Phenolic Compounds of Pigmented Rice Bran Extracts." Journal of Food Science, vol. 77, no. 7, 2012, pp. C759-64.
Jun HI, Song GS, Yang EI, et al. Antioxidant activities and phenolic compounds of pigmented rice bran extracts. J Food Sci. 2012;77(7):C759-64.
Jun, H. I., Song, G. S., Yang, E. I., Youn, Y., & Kim, Y. S. (2012). Antioxidant activities and phenolic compounds of pigmented rice bran extracts. Journal of Food Science, 77(7), C759-64. https://doi.org/10.1111/j.1750-3841.2012.02763.x
Jun HI, et al. Antioxidant Activities and Phenolic Compounds of Pigmented Rice Bran Extracts. J Food Sci. 2012;77(7):C759-64. PubMed PMID: 22708681.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Antioxidant activities and phenolic compounds of pigmented rice bran extracts. AU - Jun,Hyun-Il, AU - Song,Geun-Seoup, AU - Yang,Eun-In, AU - Youn,Young, AU - Kim,Young-Soo, Y1 - 2012/06/18/ PY - 2012/6/20/entrez PY - 2012/6/20/pubmed PY - 2012/11/10/medline SP - C759 EP - 64 JF - Journal of food science JO - J. Food Sci. VL - 77 IS - 7 N2 - UNLABELLED: This study was carried out to investigate the antioxidant activities and phenolic compounds of pigmented rice (black, red, and green rice) and brown rice brans. Antioxidant activity was determined by using 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical assay, 2,2-azino-bis-(3-ethylenebenzothiozoline-6-sulfonic acid) (ABTS) radical cation assay, reducing power, and chelating ability. Phenolic compounds were measured by using HPLC. Pigmented rice brans were extracted by using aqueous mixtures of acetone, ethanol, and methanol to determine the most effective extraction solvent. Of all solvents examined, extract from 40:60 acetone-water mixtures (v/v) provided the highest DPPH radical assay as well as the highest total phenolic and flavonoid content. We finally selected 40% acetone as an extraction solvent for antioxidant study of pigmented rice bran. Antioxidant activities of 40% acetone extracts of pigmented rice bran, measured in the range of 0 to 1500 μg/mL. At 500 μg/mL concentration, red rice bran, which had the highest total phenolic (259.5 μg/mg) and total flavonoid (187.4 μg/mg) contents, showed the highest antioxidant activity: 83.6%, 71.5%, 1.2%, and 16.4% for DPPH radical assay, ABTS radical cation assay, reducing power, and chelating ability, respectively. Red rice bran showed a lower EC(50) value (112.6 μg/mL) than that of butylated hydroxytoluene (144.5 μg/mL) from the DPPH radical assay. The major phenolic acids of red rice bran were ferulic, vanillic and p-coumaric acids. The results indicated pigmented rice bran might be used as a natural antioxidant. PRACTICAL APPLICATION: The present study revealed black and red rice bran shows high antioxidant activities and they contain high amount of phenolic compounds. Indeed, black and red rice bran could be better raw materials for manufacturing the food with high antioxidant activity. SN - 1750-3841 UR - https://www.unboundmedicine.com/medline/citation/22708681/Antioxidant_activities_and_phenolic_compounds_of_pigmented_rice_bran_extracts_ L2 - https://doi.org/10.1111/j.1750-3841.2012.02763.x DB - PRIME DP - Unbound Medicine ER -