Abstract
WE have recently reported that the petrol-phasic carotenoid fraction of butter unsaponifiable matter, when subjected to chromatographic adsorption on alumina, separates readily into two coloured zones, the upper red-brown, the lower yellow1. The appearance and location of the zones, and the absorption spectra of the elutriated pigments, are consistent with the presence of appreciable quantities of carotene in butter. The isomer has since been independently detected in butter2, using magnesium oxide as adsorbent.
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References
Gillam and Heilbron, Biochem J., 29, 834; 1935.
Strain, J. Biol. Chem., 111, 85; 1935.
Karrer and Walker, Helv. Chim. Acta, 16, 641; 1933.
Strain, J. Biol. Chem., 105, 525; 1934.
Gillam and El Ridi, Biochem J. (in press).
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Kuhn and Brockmann, Z. physiol. Chem., 206, 41; 1932. Cf. also Winterstein, ” Klein's Handbuch der Pflanzen-Analyse”, 4, 1403; 1933.
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GILLAM, A., RIDI, M. Adsorption of Grass and Butter Carotenes on Alumina. Nature 136, 914–915 (1935). https://doi.org/10.1038/136914a0
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DOI: https://doi.org/10.1038/136914a0
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