Characterization and Classification of the Provitamin A carotenoids of Deep Yellow-fleshed Bitter Yam (Dioscorea dumetorum) Varieties

Alamu E Oladeji¹, Maziya-Dixon Bussie^1, , Ferede-Menkir Roman², Popoola Ibironke¹, Asiedu Robert¹ and Gondwe Therese¹

¹International Institute of Tropical Agriculture, PMB 5320, Oyo Road, Ibadan, Oyo State, Nigeria

²Santa Monica College, Physical Science Department1900 Pico Blv, Santa Monica, CA 90094, USA

Cite this paper:
Alamu E Oladeji, Maziya-Dixon Bussie, Ferede-Menkir Roman, Popoola Ibironke, Asiedu Robert and Gondwe Therese. Characterization and Classification of the Provitamin A carotenoids of Deep Yellow-fleshed Bitter Yam (Dioscorea dumetorum) Varieties. Journal of Food and Nutrition Research. 2016; 4(10):640-645. doi: 10.12691/jfnr-4-10-2

Abstract

Twenty-two genotypes of deep yellow fleshed D. dumetorum were analysed for carotenoids using High Performance Liquid Chromatography (HPLC) and for similarities in their provitamin A characteristics using Cluster Analysis (CA). The contribution of each carotenoid to provitamin A content was investigated through correlation and regression analysis. Seven of the genotypes fell within the low provitamin A cluster with values from 2.26 µg g^-1 to 7.74 µg g^-1. Twelve genotypes were in the intermediate cluster with values between 8.56 µg g^-1 and 11.20 µg g^-1. Three genotypes were within the high cluster with values between 10.13 µg g^-1 and 14.00 µg g^-1. Trans-β-carotene-5,8 epoxide was a significant predictor (β1 = 0.773, p < 0.005) of provitamin A content of the D. dumetorum while trans-β-carotene was not a significant predictor (β2 = 0.593, p > 0.05).

Keywords:
bitter yam deep yellow fleshed carotenoids provitamin A β-carotene

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