AJCN 19th International Congress of Nutrition
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American Journal of Clinical Nutrition, Vol 56, 559-564, Copyright © 1992 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Concentrations of the water-soluble vitamins thiamin, ascorbic acid, and folic acid in serum and cerebrospinal fluid of healthy individuals

CM Tallaksen, T Bohmer and H Bell
Medical Department, Aker University Hospital, Oslo, Norway.

Thiamin, thiamin monophosphate, ascorbic acid, and folic acid were determined in serum and cerebrospinal fluid (CSF) in 31 outpatients who underwent a myelography because of back-pain. All subjects were otherwise healthy. The CSF concentration (mean +/- SD) was 8.6 +/- 3.9 nmol thiamin/L, 16.9 +/- 8.3 nmol thiamin monophosphate/L, 133 +/- 58.8 mumol ascorbic acid/L, and 44.9 +/- 13.2 nmol folic acid/L. The CSF- serum ratio was 2.1 +/- 0.8 for thiamin, 8.3 +/- 4.3 for thiamin monophosphate, 3.0 +/- 1.4 for ascorbic acid, and 3.3 +/- 0.8 for folic acid; the amount in CSF was significantly higher than in serum for each compound. These results support the existence of a saturated transport mechanism of water-soluble vitamins from serum into CSF for thiamin monophosphate, ascorbic acid, and folic acid. However, low CSF concentrations are correlated with low serum concentrations for the three vitamins. High serum concentrations should therefore be advocated to ensure high CSF concentrations.


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Copyright © 1992 by The American Society for Nutrition