Abstract
The salt mixture proposed by Phillips and Hart may exert a detrimental effect upon synthetic B vitamins in purified rations. Thiamine is apparently most, riboflavin least, affected. This destructive effect was not observed when the rations were prepared with a salt mixture described in the U.S. Pharmacopoeia. The destructive action of the Phillips and Hart salt mixture is not due to its ZnCl2 or its CuSO4 content. Its higher pH, when in a watery suspension, seems to be partly responsible for the effect.

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