Supercritical Fluid Fractionation affects the Distribution of Antioxidant Compounds of Fractions from Rice Bran Extracts

Ethanol extract (E) of rice bran was fractionated by supercritical CO_2 fluid system into four fractions (R, F1, F2, and F3) at 45°C and pressures of 30, 25, 20, and 15 MPa, respectively. This study aimed to evaluate the distribution of antioxidant compounds (γ-oryzanol, ferulic acid, and phenolic c...

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Published in臺灣農業化學與食品科學 Vol. 57; no. 2; pp. 79 - 88
Main Authors 洪千青(Chein-Ching Hung), 翁義銘(Yih-Ming Weng), 余哲仁(Zer-Ran Yu), 吳孟珊(Meng-Shan Wu), 王璧娟(Be-Jen Wang)
Format Journal Article
LanguageEnglish
Published 臺灣農業化學會＆臺灣食品科學技術學會 01.04.2019
Subjects
超臨界流體區分
Supercritical fluid fractionation
總酚
米糠
米糠醇
Antioxidant activities
Phenolic compounds
抗氧化活性
Rice bran
Ferulic acid
γ-Oryzanol
阿魏酸
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ISSN1605-2471
DOI10.6578/TJACFS.201904_57(2).0003

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Summary:Ethanol extract (E) of rice bran was fractionated by supercritical CO_2 fluid system into four fractions (R, F1, F2, and F3) at 45°C and pressures of 30, 25, 20, and 15 MPa, respectively. This study aimed to evaluate the distribution of antioxidant compounds (γ-oryzanol, ferulic acid, and phenolic compounds) and antioxidant activities of supercritical CO_2 fractions. Results showed that the highest amounts of γ-oryzanol, ferulic acid and phenolic compounds were in F3 fractions. The DPPH and ABTS radicals scavenging activities in F fractions are higher than in R fraction. The contents of phenolic compounds, γ-oryzanol and ferulic acid in fractions were significantly positive correlated with the antioxidant capacities. Linear structural models analysis showed that although the correlation between antioxidant components is high, the scavenging activities of both free radicals mainly related to phenolic compounds.
ISSN:1605-2471
DOI:10.6578/TJACFS.201904_57(2).0003