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Journal of Nutrition Vol. 5 No. 5 September 1932, pp. 495-501
Copyright © 1932 by American Society for Nutrition
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A Study of the Antimony Trichloride Color Reaction for Vitamin A

V. Evaluation of a Colorimetric Unit on the Basis of the Biological Unit for Vitamin A

Earl R. Norris and Anna E. Church

(From the Division of Biochemistry, University of Washington, Seattle)

A correlation can be made between the colorimetric assay for vitamin A using antimony trichloride, if the color value is compared where it is a linear function of the cod liver oil used in the test, and the biological assay.

Colorimetric units have been calculated in terms of the biological units for vitamin A.

Manuscript received 8 January 1932.




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