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Keywords:

  • Hunter meter;
  • carotenoids;
  • β-carotene;
  • sweetpotato;
  • Uganda

Abstract

White-fleshed sweetpotatoes (Ipomoea batatas (L) Lam) are a major food crop in Uganda. This study was done to evaluate carotenoid content in sweetpotatoes and to relate the color of the sweetpotatoes to the β-carotene present. A Hunter Color Tristimulus Meter was used to determine the color and the β-carotene was determined by reverse-phase HPLC. Regression analysis was carried out on the color values L, a, b, b/a and tan-1 b/a to determine which color value could be used to express the content of β-carotene in white-fleshed sweetpotatoes. The ‘b’ color value appeared to be the best estimation for correlation at 0·74 in this study for raw roots and 0·09 for purée. The ‘a’ value was 0·39 for raw roots and 0·16 for purée, L was -0·74 for raw roots and -0·45 for purée. © 1997 SCI.