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Profile of phenolic compounds and antioxidant activity of finger millet varieties
Jinle Xiang1, Franklin B Apea-Bah2, Victoria U Ndolo3
1Henan University of Science & Technology, College of Food & Bioengineering, Luoyang, Henan 471023, China; University of Manitoba, Department of Food & Human Nutritional Sciences, 250 Ellis Building, Winnipeg, Manitoba R3T 2N2, Canada.
Abstract:
The profiles of phenolic compounds and antioxidant capacities of four finger millet varieties harvested in northern Malawi were investigated. The total phenolics, flavonoids and condensed tannins in the free fractions ranged from 114.43 to 179.19 mg ferulic acid equivalent (FAE)/100 g, 90.24 to 202.94 mg catechin equivalent (CE)/100 g and 31.76 to 83.59 mg CE/100 g, respectively. Total phenolic contents of the bound fractions ranged from 58.27 to 123.23 mg FAE/100 g. Twenty phenolic compounds were identified in the free fractions including eighteen flavonoids, with catechin and epicatechin being the predominant flavonoids. Seventeen phenolic compounds were identified in the bound fractions, with ferulic acid being the predominant one. Ten of the identified polyphenols were firstly reported in finger millet. Darker colored finger millet varieties had higher phenolic contents and antioxidant properties than the lighter colored ones. Finger millet can be used as healthy food material and natural antioxidant resource.
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