Abstract
WITH reference to the recent communication from Prof. Karrer's laboratory1 describing the separation of vitamin A into two fractions by means of calcium hydroxide, we may recall that this separation was effected by us about two years ago2,3, using, however, fuller's earth.
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References
NATURE, 132, 26, July 1, 1933.
Acta Brevia Neerlandica, 1, 8; 1931.
Proc. Kon. Akad. Wetenschap. Amsterdam, 35, No. 10; 1932.
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VAN EEKELEN, M., EMMERIE, A., JULIUS, H. et al. Separation of Forms of Vitamin A based on the Antimony Trichloride Reaction. Nature 132, 171 (1933). https://doi.org/10.1038/132171a0
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DOI: https://doi.org/10.1038/132171a0
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