Citation: FENG Chengya, GAO Jieying, ZHEN Qianna, FAN Zimian, ZHU Mingsong, YANG Xiangchun, DING Min. Simultaneous determination of tryptophan and its metabolites in plasma by high performance liquid chromatography with on-column derivatization[J]. Chinese Journal of Chromatography, ;2013, 31(6): 577-581. doi: 10.3724/SP.J.1123.2013.01054 shu

Simultaneous determination of tryptophan and its metabolites in plasma by high performance liquid chromatography with on-column derivatization

1.
1. College of Laboratory Medicine, Chongqing Medical University, Key Laboratory of Clinical Laboratory Diagnostics of Ministry of Education, Chongqing 400016, China;

Corresponding author: DING Min,
Received Date: 30 January 2013
Available Online: 25 April 2013
Fund Project: 国家自然科学基金项目(81200294). (81200294)

A high performance liquid chromatography-ultraviolet/fluorescence detection (HPLC-UV/FLD) with on-column derivatization was established to simultaneously determine tryptophan (Trp), kynurenine (Kyn), 5-hydroxyindole acetic acid (5-Hiaa) and kynurenic acid (Kyna). A Hypersil C-18 column (250 mm×4.0 mm, 5 μ m) was used for the analysis at 30℃. The separation was carried out with the mobile phase consisting of 250 mmol/L zinc acetate (pH 5.5) and acetonitrile (95:5, v/v) at a flow rate of 0.8 mL/min using 3-nitrotyrosine as internal standard (IS). The excitation (Ex) and emission (Em) wavelengths were set at 278 nm (λ_ex)/343 nm (λ_em) for 5-Hiaa and 244 nm (λ_ex)/400 nm (λ_em) for Kyna, while the wavelengths of ultraviolet detection were set at 360 nm for Kyn and IS, 302 nm for Trp. The recoveries were in the range of 91.62% to 114.17%. The linearities were from 2.50 μ mol/L to 320.00 μ mol/L for Trp, 0.32 μ mol/L to 15.36 μ mol/L for Kyn, 3.27 nmol/L to 104.60 nmol/L for 5-Hiaa, and 14.00 nmol/L to 464.80 nmol/L for Kyna. The detection limits were 0.078 μ mol/L, 0.056 μ mol/L, 0.690 nmol/L and 1.290 nmol/L for Trp, Kyn, 5-Hiaa, and Kyna, respectively. Thirty plasma samples of normal pregnant women and 28 plasma samples of healthy controls were tested, and the results exhibited that the concentrations of Trp, Kyn and Kyna in the plasma of the normal pregnant women were significantly different from those of the control group (all P < 0.01). The method is simple and sensitive with good reproducibility, and it is suitable for clinical measurements.
- high performance liquid chromatography (HPLC),
- tryptophan,
- kynurenine,
- 5-hydroxyindole acetic acid,
- kynurenic acid,
- plasma
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