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    Characterization of phenolic compounds and antioxidant activity in sorghum grains

    Access Status
    Fulltext not available
    Authors
    Rao, S.
    Santhakumar, A.
    Chinkwo, K.
    Wu, G.
    Johnson, Stuart
    Blanchard, C.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Rao, S. and Santhakumar, A. and Chinkwo, K. and Wu, G. and Johnson, S. and Blanchard, C. 2018. Characterization of phenolic compounds and antioxidant activity in sorghum grains. Journal of Cereal Science. 84: pp. 103-111.
    Source Title
    Journal of Cereal Science
    DOI
    10.1016/j.jcs.2018.07.013
    ISSN
    0733-5210
    School
    School of Molecular and Life Sciences (MLS)
    URI
    http://hdl.handle.net/20.500.11937/73034
    Collection
    • Curtin Research Publications
    Abstract

    Phenolic composition and relative antioxidant activity were investigated in six varieties of sorghum including pigmented and non-pigmented pericarp varieties. Whole grain sorghum extracts were subjected to acidified acetone extraction and were analysed using UHPLC with an attached online ABTS system and Q-TOF LC/MS. Results showed that the black pericarp variety Shawaya short black 1 and the brown pericarp variety IS11316 had the highest total phenolic content (TPC) and total proanthocyanidin content (TPAC), consequently resulting in overall high antioxidant activity. The phenolic compounds that had the highest antioxidant activity in Shawaya and IS11316 were catechin, 1-O-cafferolglycerol-O-glucoside, taxifolin and pentahydroxyflavanone-(3->4)-catechin-7-O-glucoside. Furthermore, comparison of the phenolic profiles has shown that the varieties with higher antioxidant activity generally had higher quantities and more diverse range of polyphenols. Thus, this study indicates that there is no independent compound in sorghum that results in its high antioxidant activity but rather it is the cumulative effect of various phenolic compounds.

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