Blackwell Publishing Journal Backfiles 1879-2005
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Process Engineering, Biotechnology, Nutrition Technology
Carotenoid composition of the egg yolk of duck (Anus bochas) raised in the Philippines was investigated in order to characterize the pigments responsible for its desirable orange color. Analyses and identification were by column chromatography, thin-layer chromatography with authentic samples, visible absorption spectroscopy and chemical reactions. Principal pigments identified were β-carotene and canthaxanthin. Lower levels of echinenone, cryptoxanthin and zeaxanthin were also detected. The data obtained revealed significant differences in the carotenoid pattern of duck and chicken egg yolks. The ketocarotenoids canthaxanthin and echinenone, which apparently account for the typical orange yolk color of ducks raised under Philippine conditions, are not normally found in chicken yolk. Chicken egg yolk has been reported in the literature to contain primarily the hydroxycarotenoids lutein, zeaxanthin and cryptoxanthin. β-carotene has also been found in chicken yolk but not as a major pigment.
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