کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1215242 1494157 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Optimization of Zn2+-containing mobile phase for simultaneous determination of kynurenine, kynurenic acid and tryptophan in human plasma by high performance liquid chromatography
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Optimization of Zn2+-containing mobile phase for simultaneous determination of kynurenine, kynurenic acid and tryptophan in human plasma by high performance liquid chromatography
چکیده انگلیسی

In the present work we have developed a standard-addition HPLC method using a mobile phase containing low concentration of ZnAc2 to determine physiological level of kynurenine (KYN), kynurenic acid (KYNA) and tryptophan (TRP) in human plasma simultaneously. The method greatly improved the sensitivity of KYNA, the resolution of KYNA and TRP, and avoided clotting risk caused by high concentration of ZnAc2 in mobile phase. Samples were deproteinized by addition of equal volume of 0.6 mol/L HClO4. Analytes in supernatants were separated by an Agilent HC-C18 (2) analytical column; an aqueous mobile phase containing 20 mmol/L NaAc, 3 mmol/L ZnAc2 and 7% acetonitrile at flow rate of 1.0 mL/min. Detections were performed by a variable wavelength detector at wavelength 365 nm for KYN and a fluorescence detector at wavelengths excitation 344 nm and emission 398 nm for KYNA and TRP. Good linear responses were found with r2 > 0.999 for all analytes within the concentration range of physiological levels. The limit of detection of the developed method was 0.03 μmol/L, 0.9 nmol/L and 0.4 μmol/L for KYN, KYNA and TRP respectively. Recoveries from spiked human plasma were 95.4–99.7% for KYN, 98.9–104% for KYNA and 96.5–100.2% for TRP. All CVs for the repeatability and intermediate precision were less than 5%. We conclude that the developed method is helpful for the research investigations in KYN pathway of TRP metabolism.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography B - Volume 878, Issues 5–6, 15 February 2010, Pages 603–608
نویسندگان
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