Evaluation of antioxidant and antimicrobial properties of finger millet polyphenols (Eleusine coracana)

Viswanath, Varsha and Urooj, Asna and Malleshi, N. G. (2009) Evaluation of antioxidant and antimicrobial properties of finger millet polyphenols (Eleusine coracana). Food Chemistry, 114 (1). pp. 340-346. ISSN 0308-8146

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Abstract

Phenolic acids from finger millet (Eleusine coracana) milled fractions (whole flour, seed coat, 3%, 5% and 7%) were isolated and their antioxidant and antimicrobial properties were evaluated. Acidic methanol extracts from seed coat to whole flour were rich in polyphenol content and were found to be stable up to 48h at pH 4, 7, and 9 as studied by ultraviolet spectroscopy. Diadzene, gallic, coumaric, syringic and vanillic acids were identified as major phenolic acids from the extracted phenolics. Diadzene content was highest in concentration in the 5% flour. The reducing power of seed coat extract was significantly (p<0.05) higher than that of whole flour extract. Antioxidant activity (AA) as determined by the [beta]-carotene-linoleic acid assay indicated that the AA was highest in seed coat extract (86%), whilst at the same concentration it was only 27% in the whole flour extract. The seed coat extract showed higher antimicrobial activity against Bacillus cereus and Aspergillus flavus compared to whole flour extract. From these observations, it can be inferred that the polyphenols are responsible for the microbial activity of the millet and the results indicate that potential exists to utilise finger millet seed coat as an alternative natural antioxidant and food preservative.

Item Type:	Article
Uncontrolled Keywords:	Finger millet fractions Polyphenols Antioxidant Antimicrobial property
Subjects:	600 Technology > 08 Food technology > 32 Antioxidants 600 Technology > 08 Food technology > 21 Cereals > 05 Ragi (Finger Millet)
Divisions:	Grain Science and Technology
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	17 Jun 2009 09:09
Last Modified:	28 Dec 2011 10:10
URI:	http://ir.cftri.res.in/id/eprint/9086

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