Abstract
THE antimony trichloride colour test for vitamin A is associated with a maximum absorption at 620 mμ. We have, since 1929, repeatedly encountered an additional band near 693 mμ, but further characterization of the chromogen has been hindered by the presence of excessive amounts of vitamin A. Thus, in halibut liver oils the relative intensities 620 mμ/693 mμ. are c. 6: 1, and in halibut visceral oils 10: 1. The 693 mμ. chromogen is rarely detectable in cod liver oils and never in our experience in whale liver oils.
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Biochimica, 2, 293 (1937).
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EDISBURY, J., MORTON, R. & SIMPKINS, G. A Possible Vitamin A2. Nature 140, 234 (1937). https://doi.org/10.1038/140234a0
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DOI: https://doi.org/10.1038/140234a0
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