The ducks fed Potamogeton crispus could produce good red-yolk eggs. A kind of special red carotenoid pigmentswas found in Poamogeton crispus, and its red and some yellow pigments were in correspondence with the pigments in red-yolkeggs of ducks fed Potamogeton crispus as assayed by thin-layer chromatography (TLC) and UV-Vis spectroscopy. The redpigments in Potamogeton crispus were solubilized easily in acetone, alcohol and methyl acohol, and the wavelength of maximumabsorption (λmax) of it in acetone was 480nm. There was β-carotene found in b...
