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  • Title: Studies on the response of Lactobacillus casei to different folate monoglutamates.
    Author: Phillips DR, Wright AJ.
    Journal: Br J Nutr; 1982 Mar; 47(2):183-9. PubMed ID: 6802175.
    Abstract:
    1. The response of Lactobacillus casei was measured for a number of the monoglutamyl forms of folate derivatives. 2. At the concentrations of folate commonly used in the assay of folate vitamin in foods the response of L. casei to folic acid, (pteroylglutamic acid) and 5-formyl-tetrahydrofolic acid was similar, but 5-methyl-tetrahydrofolic acid gave as little as half the response of folic acid. 3. The response was modified by altering pH but not by concentration of ascorbate. 4. These results have implications for the assays of foods for folate where mixtures of folate derivatives are present. 5. A modified procedure is suggested in which the monoglutamates give similar responses.
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