The distribution of vitamin B2 in certain foods

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Abstract
The amount of vitamin B2 in a number of foodstuffs was estimated quantitatively by feeding to young rats the foodstuffs as additions to a basal diet complete except for vitamin B2, vitamin B1 being supplied by Peters'' antineuritic extract. The casein in the basal diet was freed of B2 by thorough washing with acidulated water and extraction with dilute acid alcohol. The vitamin B2 value of a substance was estimated by the amount necessary to produce normal growth for 4 weeks. Wheat and corn are poor in B2, the latter definitely poorer. Germ and pericarp are richer than the endosperm, but not strong sources. Dried peas are low in the vitamin. Dried ox-liver, yeast, and fresh whole milk are excellent sources, while dried meat and egg yolk are less good but richer than cereals. Negative controls developed pellagra-like symptoms and were cured by substances rich in B2. The distribution of vitamin B2 corresponds so far precisely with that of the P.P. factor and the black-tongue preventive factor, and it was concluded that all 3 are identical.

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