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• W2890342016 abstract "It is well established that homocysteine thiolactone (HTL) is associated with some health disorders, including cardiovascular diseases. HTL is a by-product of sulfur metabolic cycle. So far, its presence has been confirmed in human plasma and urine. It has been also shown that a vast majority of HTL is removed from human body through kidney. Thus, the aim of the current investigations has been the identification, separation and quantification of HTL in urine samples. For the first time a cheap, reliable and robust GC-MS method was developed for the determination of HTL in human urine in the form of its volatile isobutyl chloroformate derivative. Separation of the analyte and internal standard (homoserine lactone (HSL)) was achieved in 15 min followed by mass spectrometry detection (MS). Isocratic elution was accomplished with helium at a flow rate of 1 mL min-1 and a gradient of the column temperature was concomitant with the analysis. The mass spectrometer was set to the electron impact mode at 70 eV. The ion source, quadrupole and MS interface temperatures were set to 230 °C, 150 °C and 250 °C, respectively. Elaborated analytical procedure allows quantification of analyte in a linear range of 0.01-0.20 nmol mL-1 urine. The LOQ and LOD values were 0.01 and 0.005 nmol mL-1, respectively. The method accuracy ranged from 98.0% to 103.2%, while precision varied from 6.4% to 9.5% and from 10.7% to 16.9% for intra- and inter-day measurements, respectively. Finally, the method has been successfully implemented in the analysis of 12 urine samples donated by apparently healthy volunteers. Concentration of HTL ranged from <LOQ to 163 pmol mL-1 urine (0.51 to 13.1 μmol mol-1 Crn)." @default.
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• W2890342016 date "2018-11-01" @default.
• W2890342016 modified "2023-10-18" @default.
• W2890342016 title "Application of GC–MS technique for the determination of homocysteine thiolactone in human urine" @default.
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• W2890342016 doi "https://doi.org/10.1016/j.jchromb.2018.09.009" @default.
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