Free radical scavenging activities of γ-oryzanol constituents

γ-Oryzanol extracted from brown rice as a free radical scavenger was separated into four constituents, which were identified as cycloartenyl ferulate, 24-methylenecycroartanyl ferulate, β-sitosteryl ferulate and campesteryl ferulate by NMR and MS. All four constituents displayed scavenging activity...

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Bibliographic Details
Published in:Food Science and Technology Research 2005, Vol.11(3), pp.295-297
Main Authors: Akiyama, Y, Hori, K, Takahashi, T, Yoshiki, Y
Format: Article
Language:English
Subjects:
antioxidant activity
antioxidants
chemical analysis
cultivars
DPPH radicals
ferulic acid
free radicals
gallic acid
rice
scavenging activity
structure-activity relationships
γ-oryzanol
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Summary:γ-Oryzanol extracted from brown rice as a free radical scavenger was separated into four constituents, which were identified as cycloartenyl ferulate, 24-methylenecycroartanyl ferulate, β-sitosteryl ferulate and campesteryl ferulate by NMR and MS. All four constituents displayed scavenging activity for 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals. The scavenging activities of the four constituents were almost the same as that of ferulic acid. We confirmed that the ferulic acid 4-hydroxyl group was the active unit in γ-oryzanol constituents for DPPH radical scavenging activity.
ISSN:1344-6606
1881-3984
DOI:10.3136/fstr.11.295