Abstract
Miss E. W. HUME reports the preliminary results of an investigation on vitamin A standards, undertaken by the Accessory Food Factors Committee with the help of numerous collaborators. It appears that the discrepancies previously reported in the case of ‘concentrates' have been due to unsuspected deterioration in the course of biological tests. The factor for converting results of spectroscopic tests into international units is found to be 1,470, with a range of individual values of 1,400-1,700. The previously accepted value of 1,600 recommended by the International Conference of 1934 is, however, retained for the time being.
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Points from Foregoing Letters. Nature 139, 474 (1937). https://doi.org/10.1038/139474b0
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DOI: https://doi.org/10.1038/139474b0