IT has been shown 1 that traces of substances like furan, indol and skatol inhibit strongly the intensity of the absorption band of vitamin A with antimony trichloride at 620 mµ. In cod liver oil, ...
CAROTENE and vitamin A share with a variety of polyene substances the property of giving a blue solution with antimony trichloride in chloroform. Spectroscopical research shows that carotene gives a ...
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