Abstract
1. 1. Female rats subsisting on a carotenoid-free diet were given doses of diesters of taraxanthin and of zeaxanthol dissolved in oil. Pigments recovered from the faeces were examined chromatographically. 2. 2. One-third of the ingested pigment was recovered after passage through the alimentary tract. Most of the recovered pigment had been hydrolysed to the free carotenol. The fate of the two-thirds that disappeared is unknown. 3. 3. Part of the disaster of taraxanthin was hydrolysed by rats to a monoester. 4. 4. The possibility is discussed of using these tests in the study of lipase activity n the intestine.
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