Determination of p-hydroxyphenylpyruvate, p-hydroxyphenyllactate and tyrosine in normal human plasma by gas chromatography-mass spectrometry isotope-dilution assay.

Abstract

The synthesis and purification of [13C2]p-hydroxyphenyllactic acid from [13C2]p-hydroxyphenylpyruvic acid, the characterization of tert.-butyldimethylsilyl-derivatized tyrosine, p-hydroxyphenylpyruvic acid and p-hydroxyphenyllactic acid, and an isotope-dilution assay for these substances in normal human plasma using gas chromatography-mass spectrometry (GC-MS) are described. Using this method plasma p-hydroxyphenylpyruvate, p-hydroxyphenyllactate and tyrosine levels of 68 +/- 42 ng/ml, 118 +/- 45 ng/ml and 16.6 +/- 6.3 micrograms/ml, respectively, were found in 9 normal adults. Isotope-dilution assays are sensitive enough to determine tyrosine, p-hydroxyphenylpyruvate and p-hydroxyphenyllactate content in normal subjects, and may be useful for studying disorders of tyrosine metabolism, including inborn errors of metabolism, liver disease and ascorbic acid deficiencies.

• Authors: J C Deutsch
• Journal: Journal of chromatography. B, Biomedical sciences and applications (J Chromatogr B Biomed Sci Appl) Vol. 690 Issue 1-2 Pg. 1-6 (Mar 07 1997) ISSN: 1387-2273 [Print] Netherlands
• PMID: 9106023 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Carbon Isotopes
• Phenylpropionates
• Phenylpyruvic Acids
• 4-hydroxyphenylpyruvic acid
• 4-hydroxyphenyllactic acid
• Tyrosine
• Deuterium

Topics

• Carbon Isotopes
• Deuterium
• Gas Chromatography-Mass Spectrometry
• Humans
• Indicator Dilution Techniques
• Phenylpropionates (blood)
• Phenylpyruvic Acids (blood)
• Tyrosine (blood)