eng Science and Education Publishing Journal of Food and Nutrition Research 2333-1240 2016-09-15 4 10 640 645 10.12691/jfnr-4-10-2 JFNR20164102 article Alamu E Oladeji 1 Maziya-Dixon Bussie b.dixon@cgiar.org 1 Ferede-Menkir Roman 2 Popoola Ibironke 2 Asiedu Robert 2 Gondwe Therese 2 International Institute of Tropical Agriculture, PMB 5320, Oyo Road, Ibadan, Oyo State, Nigeria Santa Monica College, Physical Science Department1900 Pico Blv, Santa Monica, CA 90094, USA 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). http://pubs.sciepub.com/jfnr/4/10/2/jfnr-4-10-2.pdf bitter yam deep yellow fleshed carotenoids provitamin A β-carotene