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Scandinavian Journal of Clinical and Laboratory Investigation Volume 20, 1967 - Issue 1
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Original Article

Enzymatic Determination of Pyridoxal Phosphate in Plasma by Decarboxylation of L-Tyrosine-14 C (U) and a Comparison with the Tryptophan Load Test

A. Hamfelt Department of Clinical Chemistry, University Hospital, Uppsala, Sweden
Pages 1-10 | Received 11 Jan 1967, Published online: 28 Aug 2009

References

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  • Altman K., Greengard O. Correlation of kynurenine excretion with liver tryptophan pyrrolase levels in disease and after hydrocortisone induction. J. clin. Invest. 1966; 45: 1527
  • Hagberg Hamfelt B. A., Hansson O. Tryptophan load tests and pyridoxal-5-phosphate levels in epileptic children. II. Cryptogenic epilepsy. Acta paediat. scand. 1966; 55: 371
  • Hamfelt A. A method of determining pyridoxal phosphate in blood by decarboxylation of L-tyrosine-14C (U). Clin. chim. Acta 1962; 7: 746
  • Hamfelt A., de Verdier C.-H. On the determination of pyridoxal phosphate in blood by decarboxylation of tyrosine-l-14C. Acta physiol. scand. 1960; 50: 65, Suppl. 175
  • Ludwig H., Potter V. R., Heidelberger C. H., de Verdier C.-H. Automatic direct quantitation of radioactivity on paper chromatograms. Biochim. biophys. Acta Amst. 1960; 37: 525
  • Musajo L., Benassi C. A. Aspects of disorders of the kynurenine pathway of tryptophan metabolism in man. Advanc. clin. Chem. 1964; 7: 63
  • Peterson E. A., Sober H. A. Preparation of crystalline phosphorylated derivatives of vitamin B6. J. Amer. chem. Soc. 1954; 76: 169
  • Schreiber G. Uber eine Aspartataminotransferase aus Bierhefe und Verwendung zur enzymatischen Bestimmung von Vitamin B6. Dtsch. med. Forsch. 1964; 2: 67
  • Storvick C. A., Benson E. M., Edwards M. A., Woodring M. J. Chemical and microbiological determination of vitamin B6. Meth. biochem. Anal. 1964; 12: 183
  • Umbreit W. W., Bellamy W. D., Gunsalus I. C. The function of pyridoxine derivatives: A comparison of natural and synthetic codecarboxylase. Arch. Biochem. 1945; 7: 185
  • Weller H., Fichtenbaum M. Der Tryptophan-belastungstest als Nachweis eines Vitamin B6-Mangels bei Arteriosclerose. Klin. Wschr. 1961; 39: 1275
  • Woodring M. J., Fisher D. H., Storvick C. A. A microprocedure for the determination of 4-pyridoxic acid in urine. Clin. Chem. 1964; 10: 479

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