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Sobolev PD, Burnakova NA, Beloborodova NV, Revelsky AI, Pautova AK. Analysis of 4-Hydroxyphenyllactic Acid and Other Diagnostically Important Metabolites of α-Amino Acids in Human Blood Serum Using a Validated and Sensitive Ultra-High-Pressure Liquid Chromatography-Tandem Mass Spectrometry Method. Metabolites 2023; 13:1128. [PMID: 37999224 PMCID: PMC10673366 DOI: 10.3390/metabo13111128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 10/30/2023] [Accepted: 11/01/2023] [Indexed: 11/25/2023] Open
Abstract
The profile of and dynamic concentration changes in tyrosine, phenylalanine, and tryptophan metabolites in blood are of great interest since they could be considered potential biomarkers of different disorders. Some aromatic metabolites, such as 4-hydroxyphenyllactic, 4-hydroxyphenylacetic, phenyllactic, and 4-hydroxybenzoic acids have previously demonstrated their diagnostic significance in critically ill patients and patients with post-COVID-19 syndrome. In this study, a sensitive method, including serum protein precipitation with methanol and ultra-high-pressure liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) detection, was developed and validated for six phenyl- and five indole-containing acids in human serum. The liquid-liquid extraction was also examined, but it demonstrated unsatisfactory results based on analyte recoveries and the matrix effect. However, the recoveries for all analytes reached 100% and matrix effects were not observed using protein precipitation. This made it possible to use deionized water as a blank matrix. The lower limits of quantitation (LLOQs) were from 0.02 to 0.25 μmol/L. The validated method was used for the analysis of serum samples of healthy volunteers (n = 48) to reveal the reference values of the target analytes. The concentrations of the most clinically significant metabolite 4-hydroxyphenyllactic acid, which were revealed using UPLC-MS/MS and a previously developed gas chromatography-mass spectrometry method, were completely comparable. The proposed UPLC-MS/MS protocol can be used in the routine clinical practice of medical centers.
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Affiliation(s)
- Pavel D. Sobolev
- Exacte Labs Bioanalytical Laboratory, 20-2 Nauchny Proezd, 117246 Moscow, Russia; (P.D.S.); (N.A.B.)
| | - Natalia A. Burnakova
- Exacte Labs Bioanalytical Laboratory, 20-2 Nauchny Proezd, 117246 Moscow, Russia; (P.D.S.); (N.A.B.)
| | - Natalia V. Beloborodova
- Federal Research and Clinical Center of Intensive Care Medicine and Rehabilitology, 25-2 Petrovka Str., 107031 Moscow, Russia;
| | - Alexander I. Revelsky
- Chemistry Department, Lomonosov Moscow State University, GSP-1, 1-3 Leninskie Gory, 119991 Moscow, Russia;
| | - Alisa K. Pautova
- Federal Research and Clinical Center of Intensive Care Medicine and Rehabilitology, 25-2 Petrovka Str., 107031 Moscow, Russia;
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Mrštná K, Kujovská Krčmová L, Švec F. Advances in kynurenine analysis. Clin Chim Acta 2023:117441. [PMID: 37321530 DOI: 10.1016/j.cca.2023.117441] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 06/07/2023] [Accepted: 06/08/2023] [Indexed: 06/17/2023]
Abstract
Kynurenine, the first product of tryptophan degradation via the kynurenine pathway, has become one of the most frequently mentioned biomarkers in recent years. Its levels in the body indicate the state of the human physiology. Human serum and plasma are the main matrixes used to evaluate kynurenine levels and liquid chromatography is the dominant technique for its determination. However, their concentrations in blood do not always correspond to the levels in other matrixes obtained from the affected individuals. It is therefore important to decide when it is appropriate to analyse kynurenine in alternative matrices. However, liquid chromatography may not be the best option for the analysis. This review presents alternatives that can be used and summarizes the features that need to be considered prior to kynurenine determination. Possible approaches to kynurenine analysis in a variety of human matrixes, their challenges, and limitations are critically discussed.
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Affiliation(s)
- K Mrštná
- The Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Akademika Heyrovského 1203/8, 50005 Hradec Králové, Czech Republic; The Department of Clinical Biochemistry and Diagnostics, University Hospital Hradec Králové, Sokolská 581, 50005 Hradec Králové, Czech Republic
| | - L Kujovská Krčmová
- The Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Akademika Heyrovského 1203/8, 50005 Hradec Králové, Czech Republic; The Department of Clinical Biochemistry and Diagnostics, University Hospital Hradec Králové, Sokolská 581, 50005 Hradec Králové, Czech Republic.
| | - F Švec
- The Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Akademika Heyrovského 1203/8, 50005 Hradec Králové, Czech Republic
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Li Y, Lv D, Liu R, Shi Y, Wang R, Zhu Z, Yuan Y. Non-target metabolomic analysis reveals the therapeutic effect of Saposhnikovia divaricata decoction on collagen-induced arthritis rats. JOURNAL OF ETHNOPHARMACOLOGY 2021; 271:113837. [PMID: 33460755 DOI: 10.1016/j.jep.2021.113837] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 01/09/2021] [Accepted: 01/09/2021] [Indexed: 06/12/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Saposhnikovia divaricata (SD), a Chinese crude drug, has long been recognized for therapeutic effect to rheumatoid arthritis (RA). At present, the mechanisms of SD treatment in RA have not been fully understood especially on the perspective of metabolomics. AIM OF THE STUDY To study the pharmacodynamic effects of Saposhnikovia divaricata decoction on CIA rats, and explore the therapeutic mechanism by metabolomics methods. MATERIALS AND METHODS Wistar rats were randomly divided into normal group, CIA model group, dexamethasone group and SD decoction groups (10 g crude drug/kg, 5 g crude drug/kg and 2.5 g crude drug/kg of SDD). Body weight, arthritis scores, serum cytokine levels and histopathological parameters of rats were assessed. A metabolomics method based on ultra-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UHPLC-Q-TOFMS) was established to collect the metabolic profiles of rats and explore the metabolic changes that occurred after SDD treatment. RESULTS SDD showed its protective effect on the affected joints, especially in the middle dosage group of SDD. Eighteen and 13 potential biomarkers for the SDD treatment of CIA rats were identified in the plasma and urine, respectively. SDD could regulate the disturbed metabolic pathways including tryptophan metabolism, glycerophospholipid catabolism, primary bile acid biosynthesis and fatty acid metabolism. CONCLUSIONS In summary, SDD treatment could effectively alleviate symptoms of RA and regulate metabolic disorders in CIA rats.
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Affiliation(s)
- Yueyue Li
- Department of Pharmacy, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, 200011, China
| | - Diya Lv
- Department of Pharmaceutical Analysis, School of Pharmacy, Second Military Medical University, Shanghai 200433, China
| | - Rong Liu
- Department of Pharmacy, Shanghai Xinhua Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, 200092, China
| | - Yuhuan Shi
- Department of Pharmacy, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, 200011, China
| | - Rong Wang
- Department of Pharmacy, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, 200011, China
| | - Zhenyu Zhu
- Department of Pharmaceutical Analysis, School of Pharmacy, Second Military Medical University, Shanghai 200433, China
| | - Yongfang Yuan
- Department of Pharmacy, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, 200011, China.
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Fan M, Lu D, You R, Chen C, Lu Y, Wu Y, Shen H, Feng S. Highly sensitive detection of tryptophan (Trp) in serum based on diazo-reaction coupling with Surface-Enhanced Raman Scattering and colorimetric assay. Anal Chim Acta 2020; 1119:52-59. [DOI: 10.1016/j.aca.2020.04.039] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 03/14/2020] [Accepted: 04/14/2020] [Indexed: 12/19/2022]
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Atherton JG, Hains DS, Bissler J, Pendley BD, Lindner E. Generation, clearance, toxicity, and monitoring possibilities of unaccounted uremic toxins for improved dialysis prescriptions. Am J Physiol Renal Physiol 2018. [PMID: 29537310 DOI: 10.1152/ajprenal.00106.2017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Current dialysis-dosing calculations provide an incomplete assessment of blood purification. They exclude clearances of protein-bound uremic toxins (PB-UTs), such as polyamines, p-cresol sulfate, and indoxyl sulfate, relying solely on the clearance of urea as a surrogate for all molecules accumulating in patients with end-stage renal disease (ESRD). PB-UTs clear differently in dialysis but also during normal renal function. The kidney clears PB toxins via the process of secretion, whereas it clears urea through filtration. Herein, we review the clearance, accumulation, and toxicity of various UTs. We also suggest possible methods for their monitoring toward the ultimate goal of a more comprehensive dialysis prescription. A more inclusive dialysis prescription would retain the kidney-filtration surrogate, urea, and consider at least one PB toxin as a surrogate for UTs cleared through cellular secretion. A more comprehensive assessment of UTs that includes both secretion and filtration is expected to result in a better understanding of ESRD toxicity and consequently, to reduce ESRD mortality.
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Affiliation(s)
- James G Atherton
- Department of Biomedical Engineering, University of Memphis , Memphis, Tennessee.,Le Bonheur Children's Hospital , Memphis, Tennessee
| | | | - John Bissler
- Le Bonheur Children's Hospital , Memphis, Tennessee
| | - Bradford D Pendley
- Department of Biomedical Engineering, University of Memphis , Memphis, Tennessee
| | - Ernő Lindner
- Department of Biomedical Engineering, University of Memphis , Memphis, Tennessee
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Sadok I, Gamian A, Staniszewska MM. Chromatographic analysis of tryptophan metabolites. J Sep Sci 2017; 40:3020-3045. [PMID: 28590049 PMCID: PMC5575536 DOI: 10.1002/jssc.201700184] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 05/15/2017] [Accepted: 05/24/2017] [Indexed: 12/14/2022]
Abstract
The kynurenine pathway generates multiple tryptophan metabolites called collectively kynurenines and leads to formation of the enzyme cofactor nicotinamide adenine dinucleotide. The first step in this pathway is tryptophan degradation, initiated by the rate-limiting enzymes indoleamine 2,3-dioxygenase, or tryptophan 2,3-dioxygenase, depending on the tissue. The balanced kynurenine metabolism, which has been a subject of multiple studies in last decades, plays an important role in several physiological and pathological conditions such as infections, autoimmunity, neurological disorders, cancer, cataracts, as well as pregnancy. Understanding the regulation of tryptophan depletion provide novel diagnostic and treatment opportunities, however it requires reliable methods for quantification of kynurenines in biological samples with complex composition (body fluids, tissues, or cells). Trace concentrations, interference of sample components, and instability of some tryptophan metabolites need to be addressed using analytical methods. The novel separation approaches and optimized extraction protocols help to overcome difficulties in analyzing kynurenines within the complex tissue material. Recent developments in chromatography coupled with mass spectrometry provide new opportunity for quantification of tryptophan and its degradation products in various biological samples. In this review, we present current accomplishments in the chromatographic methodologies proposed for detection of tryptophan metabolites and provide a guide for choosing the optimal approach.
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Affiliation(s)
- Ilona Sadok
- Laboratory of Separation and Spectroscopic Method Applications, Centre for Interdisciplinary ResearchThe John Paul II Catholic University of LublinLublinPoland
| | - Andrzej Gamian
- Laboratory of Medical MicrobiologyHirszfeld Institute of Immunology and Experimental TherapyPolish Academy of SciencesWroclawPoland
- Department of Medical BiochemistryWroclaw Medical UniversityWroclawPoland
| | - Magdalena Maria Staniszewska
- Laboratory of Separation and Spectroscopic Method Applications, Centre for Interdisciplinary ResearchThe John Paul II Catholic University of LublinLublinPoland
- Laboratory of Medical MicrobiologyHirszfeld Institute of Immunology and Experimental TherapyPolish Academy of SciencesWroclawPoland
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Sidorova AA, Kartsova LA. Study of the kynurenine pathway of tryptophan metabolism by capillary electrophoresis and mass spectrometry. JOURNAL OF ANALYTICAL CHEMISTRY 2011. [DOI: 10.1134/s1061934811030166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Badawy AAB, Morgan CJ. Rapid Isocratic Liquid Chromatographic Separation and Quantification of Tryptophan and Six kynurenine Metabolites in Biological Samples with Ultraviolet and Fluorimetric Detection. Int J Tryptophan Res 2010; 3:175-86. [PMID: 22084598 PMCID: PMC3195243 DOI: 10.4137/ijtr.s6225] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
A simple, rapid isocratic liquid chromatographic procedure with ultraviolet and fluorimetric detection is described for the separation and quantification of L-tryptophan (Trp) and six of its kynurenine metabolites (kynurenine, 3-hydroxykynurenine, and 3-hydroxyanthranilic, kynurenic, xanthurenic and anthranilic acids). Using the Perkin Elmer LC 200 system, a reverse phase Synergi 4 μ fusion-RP80 A column (250 × 4.6 mm) (Phenomenex), and a mobile phase of 10 mM sodium dihydrogen phosphate: methanol (73:27, by vol) at pH 2.8 and a flow rate of 1.0-1.2 ml/min at 37 °C, a run took ∼13 min. The run took <7 min at 40 °C and a 1.4 ml/min flow rate. Limits of detection of all 7 analytes were 5-72 nM and their recoveries from human plasma and rat serum and liver varied between 62% and 111%. This simple method is suitable for high throughput work and can be further developed to include quinolinic acid and other Trp metabolites.
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Affiliation(s)
- Abdulla A-B Badawy
- The Cardiff School of Health Sciences, University of Wales Institute Cardiff (UWIC), Western Avenue, Cardiff CF5 2YB, Wales, UK
| | - Christopher J Morgan
- Department of Medical Biochemistry, University Hospital of Wales, Heath Park, Cardiff CF14 4XW, Wales, UK
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Zhou L, Glennon JD, Luong JHT. Electrophoretic Analysis of Biomarkers using Capillary Modification with Gold Nanoparticles Embedded in a Polycation and Boron Doped Diamond Electrode. Anal Chem 2010; 82:6895-903. [DOI: 10.1021/ac101105q] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lin Zhou
- Innovative Chromatography Group, Irish Separation Science Cluster (ISSC), Department of Chemistry & the ABCRF, University College Cork, Cork, Ireland and Biotechnology Research Institute, National Research Council Canada, Montreal, Quebec, Canada H4P 2R2
| | - Jeremy D. Glennon
- Innovative Chromatography Group, Irish Separation Science Cluster (ISSC), Department of Chemistry & the ABCRF, University College Cork, Cork, Ireland and Biotechnology Research Institute, National Research Council Canada, Montreal, Quebec, Canada H4P 2R2
| | - John H. T. Luong
- Innovative Chromatography Group, Irish Separation Science Cluster (ISSC), Department of Chemistry & the ABCRF, University College Cork, Cork, Ireland and Biotechnology Research Institute, National Research Council Canada, Montreal, Quebec, Canada H4P 2R2
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Xiang ZY, Tang AG, Ren YP, Zhou QX, Luo XB. Simultaneous determination of serum tryptophan metabolites in patients with systemic lupus erythematosus by high performance liquid chromatography with fluorescence detection. Clin Chem Lab Med 2010; 48:513-7. [PMID: 20187853 DOI: 10.1515/cclm.2010.105] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND To provide a more comprehensive clinic marker of tryptophan (TRP) catabolism in patients with systemic lupus erythematosus (SLE), we developed a simple and efficient method that simultaneously measured serum TRP, kynurenine (KYN), and kynurenic acid (KYNA) using high performance liquid chromatography with fluorescence detection (HPLC-FD). METHODS A simple and specific high performance liquid chromatography (HPLC) method was developed for simultaneously quantitative determination of TRP, KYN and KYNA with fluorescence detection (FD) using programmed wavelength and on-column fluorescence derivatization. Thirty patients with SLE and 80 healthy control subjects were analyzed for serum TRP metabolites using the assay we developed. The tryptophan breakdown index (TBI) and neuroprotective ratio (NPR) were calculated. RESULTS The retention time of KYN, KYNA and TRP were 8.5 min, 13.7 min and 17.6 min, respectively. The linear range for TRP was 0.245-196 micromol/L, the limit of detection (LOD) was 0.001 micromol/L and average recovery was 103.71%. The linear range for KYN was 0.049-98 v/L, the LOD was 0.0245 micromol/L, and average recovery was 97.45%. The linear range for KYNA was 1.05-2093 nmol/L, the LOD was 0.05 nmol/L, and average recovery was 100.60%. Inter-day and intra-day relative standard deviations (SDs) were <5%. Phenylalanine, tyrosine, 5-hydroxytryptamine and creatinine did not interfere with the method. The results showed great differences in TRP, KYN and KYNA contents and TBI between patients with SLE and healthy controls, but little difference in NPR. CONCLUSIONS The method is simple, fast, accurate, and meets the requirements for simultaneous determination of TRP, KYN and KYNA in serum.
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Affiliation(s)
- Zhong-Yuan Xiang
- Department of Clinical Laboratory, Second Xiangya Hospital, Central South University, Changsha, PR China
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Midttun Ø, Hustad S, Ueland PM. Quantitative profiling of biomarkers related to B-vitamin status, tryptophan metabolism and inflammation in human plasma by liquid chromatography/tandem mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2009; 23:1371-1379. [PMID: 19337982 DOI: 10.1002/rcm.4013] [Citation(s) in RCA: 272] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Vitamins B2 and B6 serve as cofactors in enzymatic reactions involved in tryptophan and homocysteine metabolism. Plasma concentrations of these vitamins and amino acids are related to smoking and inflammation, and correlate with other markers of immune activation. Large-scale studies of these relations have been hampered by lack of suitable analytical methods. The assay described includes riboflavin, five vitamin B6 forms (pyridoxal 5'-phosphate, pyridoxal, 4-pyridoxic acid, pyridoxine and pyridoxamine), tryptophan and six tryptophan metabolites (kynurenine, kynurenic acid, anthranilic acid, 3-hydroxykynurenine, xanthurenic acid and 3-hydroxyanthranilic acid), cystathionine, neopterin and cotinine. Trichloroacetic acid containing 13 isotope-labelled internal standards was added to 60 microL of plasma, the mixture was centrifuged, and the resulting supernatant used for analysis. The analytes were separated within 5 min on a stable-bond C8 column by a gradient-type mobile phase containing acetonitrile, heptafluorobutyric acid and high concentration (650 mmol/L) of acetic acid, and detected using electrospray ionization tandem mass spectrometry (ESI-MS/MS). The mobile phase ensured sufficient separation and high ionization efficiency of all analytes. Recoveries were 75-123% and within-day and between-day coefficients of variance (CVs) were 2.5-9.5% and 5.4-16.9%, respectively. Limits of detection ranged from 0.05 to 7 nmol/L. The method enables quantification of endogenous plasma concentrations of 16 analytes related to B-vitamin status and inflammation, and may prove useful in large-scale epidemiological studies.
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Affiliation(s)
- Øivind Midttun
- Bevital A/S, Armauer Hansens Hus, N-5021 Bergen, Norway.
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Ma L, Xu B, Wang W, Deng W, Ding M. Analysis of tryptophan catabolism in HBV patients by HPLC with programmed wavelength ultraviolet detection. Clin Chim Acta 2009; 405:94-6. [PMID: 19376101 DOI: 10.1016/j.cca.2009.04.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2009] [Revised: 04/10/2009] [Accepted: 04/10/2009] [Indexed: 10/20/2022]
Abstract
BACKGROUND In order to understand the tryptophan catabolism in acute and chronic hepatitis B patients, we quantitatively analyzed plasma kynurenine and tryptophan simultaneously by high performance liquid chromatography with programmed wavelength ultraviolet detection. METHODS A new and specific high performance liquid chromatography method to simultaneously measure plasma kynurenine and tryptophan with programmed wavelength ultraviolet detection using 3-nitro-tyrosine as internal standard was elaborated. Thirty patients were recruited (10 patients with acute HBV, 10 with chronic HBV and 10 healthy subjects). RESULTS The retention times of kynurenine and tryptophan were 2.9 min and 4.4 min, respectively. For kynurenine, the assay was linear from 0.442 micromol/l to 18.3 micromol/l. For tryptophan, the linearity was from 3.67 to 470 micromol/l. The detection limits were 0.014 micromol/l for Kyn and 0.122 micromol/l for Trp, respectively. Its precision and recovery are satisfactory. In this study we found that the kynurenine per tryptophan ratio of acute group is higher than control group and chronic group. CONCLUSIONS The method is simple, fast, accurate, and suitable for applicability to clinical measurement.
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Affiliation(s)
- Li Ma
- Key Laboratory of Clinical Laboratory Diagnostics, Ministry of Education, The Faculty of Laboratory Medicine, Chongqing Medical University, Chongqing, 400016, China
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Kawai K, Ishikawa H, Ohashi K, Itoh Y, Teradaira R. Rapid, simple and simultaneous measurement of kynurenine and tryptophan in plasma by column switching-HPLC method. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.ics.2007.07.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Molnár-Perl I. Advancements in the rapid and sensitive analyses of tryptophan and its metabolites, by chromatography. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.ics.2007.07.052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Bladek J, Neffe S. Application of Thin‐Layer Chromatography in Clinical Chemistry. SEPARATION AND PURIFICATION REVIEWS 2003. [DOI: 10.1081/spm-120025026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Marklová E, Albahri Z, Nozicková M. HPLC Profiling of Trp-related Metabolites In Humans. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2003; 527:739-44. [PMID: 15206797 DOI: 10.1007/978-1-4615-0135-0_87] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
Screening for metabolic abnormalities of Trp has been introduced using SPE pre-treatment, TLC and/or two HPLC procedures. The excretory pattern in urine (occasionally also plasma and CSF levels) has been followed in a group of 390 children showing various symptoms of a metabolic defect and in 195 patients with skin diseases, namely those associated with photosensitivity, such as porphyria, vitiligo, alopecia, psoriasis, erythematodes, and others. Excretory abnormalities of either indican, kynurenine, 3-hydroxyanthranilic acid or indolylacryloylglycine have been occasionally combined with myopathy, seizures, liver and intestinal symptoms. Several indoles and kynurenine derivatives present changes in the alopecia group and the vitiliginous patients.
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Affiliation(s)
- Eliska Marklová
- Charles University, Faculty of Medicine, Department of Paediatrics, Hradec Králové, Czech Republic.
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Vaarmann A, Kask A, Mäeorg U. Novel and sensitive high-performance liquid chromatographic method based on electrochemical coulometric array detection for simultaneous determination of catecholamines, kynurenine and indole derivatives of tryptophan. J Chromatogr B Analyt Technol Biomed Life Sci 2002; 769:145-53. [PMID: 11936687 DOI: 10.1016/s1570-0232(01)00639-0] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel and simple method has been developed for the simultaneous quantification of tryptophan, kynurenine and indole derivatives as well as four catecholamines, including dopamine, noradrenaline, homovanillic acid and 3,4-dihydroxyphenylacetic acid. The method utilises isocratic reversed-phase high-performance liquid chromatography with electrochemical coulometric array detection. The influence of various parameters on chromatographic performance, such as the composition and the pH of the mobile phase and the detection potentials, was investigated. Separation of 13 compounds was achieved by a mobile phase consisting of 10% methanol in 50 mM sodium phosphate-acetate buffer, pH 4.10, containing 0.42 mM octanesulphonic acid. The calibration curve was linear over the range 12 pg to 300 ng on-column. The detection limits (SIN 3) depended on the working potential and were found to be between 10 and 100 pg injected. The method was reproducible with intra-day RSDs of 0.3 to 1.5% and inter-day RSDs of 0.5 to 4%.
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Anderson RJ, Bendell DJ, Garnett I, Groundwater PW, Lough WJ, Mills MJ, Savery D, Shattock PEG. Identification of indolyl-3-acryloylglycine in the urine of people with autism. J Pharm Pharmacol 2002; 54:295-8. [PMID: 11858215 DOI: 10.1211/0022357021778349] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
HPLC analysis of the urine of autistic subjects indicated the presence of an unidentified component in greatly increased concentrations. We have reported the isolation of this component by HPLC and its identification. Mass spectrometry, NMR and UV spectroscopy identified the peak as corresponding to indolyl-3-acryloylglycine (IAG, 3), and this has been confirmed by an independent synthesis.
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Affiliation(s)
- Rosaleen J Anderson
- Institute of Pharmacy, Chemistry and Biomedical Sciences, University of Sunderland, UK.
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