Biosynthesis and Possible Functional Relationships Among the Carotenoids; and Between Chlorophyll a and Chlorophyll b.

Abstract
The algae Chlorella and Scenedesmus were fed C14O2 in the light. The C14 labeled pigments were separated chromatographically and the specific radioactivities of the pigments determined. The specific radioactivity of chlorophyll a was 3 times greater than that of chlorophyll b. The carotenoids fell into 3 groups on the basis of C14-content; [alpha] and [beta] carotene had the greatest values, xanthophyll and violaxanthin intermediate values, and the mono-epoxides the lowest values. Possible relationships between the carotenoids are discussed.

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