Journal of Food and Nutrition Research
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Journal of Food and Nutrition Research. 2016, 4(10), 640-645
DOI: 10.12691/jfnr-4-10-2
Open AccessArticle

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

Alamu E Oladeji1, Maziya-Dixon Bussie1, , 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

Pub. Date: September 15, 2016

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


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).

bitter yam deep yellow fleshed carotenoids provitamin A β-carotene

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