Though the presence of carotenoid pigments is used in yeast taxonomy to differentiate the genus Rhodotorula from the genera Cryptococcus and Torulopsis (Lodder and Kreger-Van Rij, 1952), no routine procedure seems to have been developed for the extraction, separation, and quantitative determination of the carotenoids in yeasts. The carotenoid character of the pigments of the Rhodotorulae has been well established (
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