The folacin contents of foods as measured by a radiometric microbiologic method.

A radiometric microbiologic assay for folate was applied to measure food folacin levels. Sixteen different foods were analyzed. The total folacin content of the 16 foods obtained by the radiometric microbiologic method was found to compare well with that obtained by the turbidimetric microbiologic method. The folacin content ranged from 9 ng/ml of frozen reconstituted grape juice to 1820 micrograms/100 g of the cereal Total. The study showed that the radiometric microbiologic assay can be used to measure folacin content in foods.