title: Simultaneous determination of several amino acids, including homocysteine, cysteine and glutamic acid, in human plasma by isocratic reversed-phase high-performance liquid chromatography with fluorimetric detection.
abstract: A method for the simultaneous measurement of two biologically important thiol compounds cysteine and homocysteine and five amino acids including neurotransmitters aspartate and glutamate is reported. This method utilized derivatization of compounds with o-phthalaldehyde in the presence of 2-mercaptoethanol following alkylation of the free sulfydryl group with iodoacetic acid followed by separation using reversed-phase high-performance liquid chromatography. These o-phthalaldehyde-2-mercaptoethanol-labeled compounds were separated within 30 min on a Spherisorb ODS-2 column with isocratic elution using 17% methanol, 0.04 M sodium phosphate buffer (pH 7.0), 0.002 M Na2EDTA and detected fluorimetrically (excitation 340 nm, emission 450 nm). Using this method, the concentrations of homocysteine, cysteine, glutamic acid. aspartic acid, asparagine, serine and glutamine in human plasma were determined.
authors.affiliation: Institute of Experimental Medicine, Russian Academy of Medical Sciences, St. Petersburg. tcherkas@mail.ru
authors.forename: Y V
authors.initials: YV
authors.lastname: Tcherkas
authors.forename: A D
authors.initials: AD
authors.lastname: Denisenko
mesh_terms: D002318:Cardiovascular Diseases / Q000097:blood; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003545:Cysteine / Q000097:blood* / Q000737:chemistry; D018698:Glutamic Acid / Q000097:blood* / Q000737:chemistry; D006710:Homocysteine / Q000097:blood* / Q000737:chemistry; D006801:Humans; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence; D009764:o-Phthalaldehyde / Q000737:chemistry
chemical_list: D006710:Homocysteine; D018698:Glutamic Acid; D009764:o-Phthalaldehyde; D003545:Cysteine