Abstract
RECENTLY (1932),1 we have advanced indirect evidence for the belief that crystalline specimens of vitamin B1 from baker's yeast, prepared by our methods, were more potent than those of Windaus, Tschesche et al. (1932).2 Owing to their courtesy, we have been able to confirm this by direct test. Comparative tests upon pigeons (by curative method) have been made. As birds developed characteristic symptoms, they have been given alternately by mouth, approximately 14γ (0.014 mgm.) of each preparation. (Results by mouth are usually 30 per cent. lower than by injection.) The results were as follows:
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References
J. Physiol., 76, 1; 1932.
Windaus, Tachesche, Ruhkopf, Lanquer, and Schultz, Z. physiol. Chem., 204, 123; 1932.
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KINNERSLEY, H., O'BRIEN, J. & PETERS, R. Potency of Vitamin B1 Preparations. Nature 130, 774 (1932). https://doi.org/10.1038/130774b0
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DOI: https://doi.org/10.1038/130774b0
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