A simplified microbiological assay for determining the folate content of red cells is described. As in previously reported methods Lactobacillus casei is used as test organism but two modifications are introduced. First, haemolysis is carried out in water containing 1 g.% of ascorbic acid; secondly, haemolysates are not incubated before the assay. Using this assay, recovery of pteroylglutamic acid added in two different concentrations to five different whole blood samples was 97.0 +/- 1.9 S.E. % and 106.1 +/- 4.7 S.E. % respectively. The coefficient of variation of the assay was between 11.2 and 15.0%. Haemolysates were best stored deep frozen, showing no significant loss of L. casei activity for three to five months at -20 degrees C. On the other hand, non-haemolysed blood samples were best stored at 4 degrees C. when there was no loss of activity for seven to 10 days. Experiments confirmed that plasma is necessary for the maximum release of red cell L. casei activity, and showed that only small amounts of plasma are necessary; folate- and B(12)-deficient plasma released slightly lower L. casei activities from red cells than did normal plasma. The red cell folate levels of 40 healthy normal subjects ranged from 160 to 640 mmug...Continue Reading
Blood folic acid activity of normal humans, cancer patients, and noncancer patients; with a few observations on animals
Histidine metabolic loading test to distinguish folic acid deficiency from vit. B12 in megaloblastic anemias
Conventional voltage electrophoresis for formiminoglutamic-acid determination in folic acid deficiency
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Ordering folate assays is no longer justified for investigation of anemias, in folic acid fortified countries
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Lower risk of cervical intraepithelial neoplasia in women with high plasma folate and sufficient vitamin B12 in the post-folic acid fortification era
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