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• Chukwumah, Y
• Walker, LT.
• Verghese, M
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• Walker, LT.
• Verghese, M
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• Walker, LT.
• Verghese, M

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Int. J. Mol. Sci. 2009, 10(11), 4941-4952; doi:10.3390/ijms10114941

Article

Peanut Skin Color: A Biomarker for Total Polyphenolic Content and Antioxidative Capacities of Peanut Cultivars

Yvonne Chukwumah, Lloyd T. Walker*  and Martha Verghese

Department of Food and Animal Sciences, Alabama A&M University, P O Box 1628, Normal, AL 35762, USA

* Author to whom correspondence should be addressed.

Received: 23 September 2009; in revised form: 4 November 2009 / Accepted: 5 November 2009 / Published: 11 November 2009

(This article belongs to the Special Issue Phenolics and Polyphenolics)

Download PDF Full-Text [1272 KB, uploaded 11 November 2009 11:58 CET]

Abstract: Attempts to establish a relationship between peanut skin color (PSC) and total flavonoid (TF) content have produced inconclusive results. This study investigated the potential of PSC as a biomarker for polyphenol content and antioxidant capacity. Peanut cultivars were objectively evaluated for their skin color, total phenolic (TP), flavonoid (TF), proanthocyanidin (TPC) contents and antioxidant capacities (AC). Their relationship was determined by Pearson’s correlation analyses. TP had stronger correlations with CIE a*, hue angle and AC (r² = 0.77, 0.82 and 0.80, respectively) compared to TF. Therefore, hue angle of peanut skin may be used as a biomarker for TP content rather than TF.

Keywords: peanut (Arachis hypogaea L.); groundnut; skin color; polyphenols; flavonoids proanthocyanidin; cultivars; biomarker

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