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Jiang F, Liu J, Li Y, Lu Z, Liu Q, Xing Y, Zhu J, Huang M, Zhong G. Signal interference between drugs and metabolites in LC-ESI-MS quantitative analysis and its evaluation strategy. J Pharm Anal 2024; 14:100954. [PMID: 39175610 PMCID: PMC11340582 DOI: 10.1016/j.jpha.2024.02.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2023] [Revised: 01/06/2024] [Accepted: 02/21/2024] [Indexed: 08/24/2024] Open
Abstract
Liquid chromatography-electrospray ionization tandem mass spectrometry (LC-ESI-MS) is a widely utilized technique for in vivo pharmaceutical analysis. Ionization interference within electrospray ion source, occurring between drugs and metabolites, can lead to signal variations, potentially compromising quantitative accuracy. Currently, method validation often overlooks this type of signal interference, which may result in systematic errors in quantitative results without matrix-matched calibration. In this study, we conducted an investigation using ten different groups of drugs and their corresponding metabolites across three LC-ESI-MS systems to assess the prevalence of signal interference. Such interferences can potentially cause or enhance nonlinearity in the calibration curves of drugs and metabolites, thereby altering the relationship between analyte response and concentration for quantification. Finally, we established an evaluation scheme through a step-by-step dilution assay and employed three resolution methods: chromatographic separation, dilution, and stable labeled isotope internal standards correction. The above strategies were integrated into the method establishment process to improve quantitative accuracy.
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Affiliation(s)
- Fulin Jiang
- Institute of Clinical Pharmacology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510080, China
- Guangdong RangerBio Technologies Co., Ltd., Dongguan, Guangdong, 523000, China
| | - Jingyu Liu
- Institute of Clinical Pharmacology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510080, China
| | - Yagang Li
- Institute of Clinical Pharmacology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510080, China
| | - Zihan Lu
- Institute of Clinical Pharmacology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510080, China
| | - Qian Liu
- Guangdong RangerBio Technologies Co., Ltd., Dongguan, Guangdong, 523000, China
| | - Yunhui Xing
- Institute of Clinical Pharmacology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510080, China
| | - Janshon Zhu
- Guangdong RangerBio Technologies Co., Ltd., Dongguan, Guangdong, 523000, China
| | - Min Huang
- Institute of Clinical Pharmacology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510080, China
| | - Guoping Zhong
- Institute of Clinical Pharmacology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510080, China
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Chen X, Chen T, Huang Y, Wang M, Wang Y, Wu P, Xia X, Du P, Wu J, Shen J, Jia Y. LC-MS/MS method for quick detection of vonoprazan fumarate in human plasma: Development, validation and its application to a bioequivalence study. Biomed Chromatogr 2024; 38:e5860. [PMID: 38558021 DOI: 10.1002/bmc.5860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2024] [Revised: 02/03/2024] [Accepted: 02/21/2024] [Indexed: 04/04/2024]
Abstract
A liquid chromatography-tandem mass spectrometry method with vonoprazan fumarate-d4 as a stable isotope-labeled internal standard was developed and validated aiming at quantification of vonoprazan fumarate in human plasma for a bioequivalence study. Chromatographic separation was achieved by acetonitrile one-step protein precipitation using a gradient elution of 0.1% formic acid aqueous solution and acetonitrile with a run time of 3.65 min. Detection was carried out on a tandem mass spectrometer in multiple reaction monitoring mode via a positive electrospray ionization interface. The multiple reaction monitoring mode of precursor-product ion transitions for vonoprazan fumarate and vonoprazan fumarate-d4 were m/z 346.0 → 315.1 and 350.0 → 316.0, respectively. The linear range was 0.150-60.000 ng/ml. This method was fully validated with acceptable results in terms of selectivity, carryover, lower limit of quantification, calibration curve, accuracy, precision, dilution effect, matrix effect, stability, recovery and incurred sample reanalysis. A successful application of this method was realized in the bioequivalence study of vonoprazan fumarate tablet (20 mg) among healthy Chinese volunteers.
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Affiliation(s)
- Xinyan Chen
- Anhui Provincial Center of Drug Clinical Evaluation, Yijishan Hospital of Wannan Medical College, Wuhu, Anhui, People's Republic of China
- School of pharmacy, Wannan Medical College, Wuhu, Anhui, People's Republic of China
| | - Tao Chen
- Jiangsu Wangao Pharmaceutical Co., Ltd., Nantong, Jiangsu, People's Republic of China
| | - Yunzhe Huang
- School of pharmacy, Wannan Medical College, Wuhu, Anhui, People's Republic of China
| | - Minhui Wang
- Anhui Provincial Center of Drug Clinical Evaluation, Yijishan Hospital of Wannan Medical College, Wuhu, Anhui, People's Republic of China
| | - Yaqin Wang
- Anhui Provincial Center of Drug Clinical Evaluation, Yijishan Hospital of Wannan Medical College, Wuhu, Anhui, People's Republic of China
| | - Ping Wu
- Anhui Provincial Center of Drug Clinical Evaluation, Yijishan Hospital of Wannan Medical College, Wuhu, Anhui, People's Republic of China
| | - Xiaocui Xia
- Anhui Provincial Center of Drug Clinical Evaluation, Yijishan Hospital of Wannan Medical College, Wuhu, Anhui, People's Republic of China
| | - Pengfei Du
- School of pharmacy, Wannan Medical College, Wuhu, Anhui, People's Republic of China
| | - Jianbang Wu
- School of pharmacy, Wannan Medical College, Wuhu, Anhui, People's Republic of China
| | - Jie Shen
- Anhui Provincial Center of Drug Clinical Evaluation, Yijishan Hospital of Wannan Medical College, Wuhu, Anhui, People's Republic of China
- School of pharmacy, Wannan Medical College, Wuhu, Anhui, People's Republic of China
| | - Yuanwei Jia
- Anhui Provincial Center of Drug Clinical Evaluation, Yijishan Hospital of Wannan Medical College, Wuhu, Anhui, People's Republic of China
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Xiao Z, Xing Y, Zhu J, Liu Y, Wang J, Liu Q, Huang M, Zhong G. An effective pretreatment technique based on multi-walled carbon nanotubes to reduce the matrix effect in plasma samples analyzed by a new type probe electrospray ionization method. Anal Chim Acta 2023; 1263:341268. [PMID: 37225332 DOI: 10.1016/j.aca.2023.341268] [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: 11/28/2022] [Revised: 03/22/2023] [Accepted: 04/23/2023] [Indexed: 05/26/2023]
Abstract
The quantitative analysis of drug plasma samples plays an important role in the drug development and drug clinical use. Our research team developed a new electrospray ion source-Micro probe electrospray ionization (μPESI) in the early stage, which was combined with mass spectrometry (μPESI-MS/MS) showing good qualitative and quantitative analysis performance. However, matrix effect severely interfered the sensitivity in μPESI-MS/MS analysis. To solve this problem, we recently developed a Solid-phase purification method based on multi-walled carbon nanotubes (MWCNTs), which was used for removing matrix interfering substances (especially phospholipid compounds) in the preparation of plasma samples, so as to reduce the matrix effect. In this study, aripiprazole (APZ), carbamazepine (CBZ) and omeprazole (OME) were used as representative analytes, the quantitative analysis related to the plasma samples spiked with the analytes above and the mechanism of the MWCNTs to reduce matrix effect were both investigated. Compared with the ordinary protein precipitation, MWCNTs could reduced the matrix effect for several to dozens of times, which resulting from the removement of phospholipid compounds from the plasma samples by MWCNTs in the selective adsorption manner. We further validated the linearity, precision and accuracy of this pretreatment technique by the μPESI-MS/MS method. These parameters all met the requirements of FDA guidelines. It was showed that MWCNTs have a good application prospect in the drug quantitative analysis of plasma samples using the μPESI-ESI-MS/MS method.
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Affiliation(s)
- Zhenwei Xiao
- Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong, 510080, China; Guangdong RangerBio Technologies Co., Ltd., Dongguan, Guangdong, 523000, China.
| | - Yunhui Xing
- Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong, 510080, China; Guangdong RangerBio Technologies Co., Ltd., Dongguan, Guangdong, 523000, China.
| | - Janshon Zhu
- Guangdong RangerBio Technologies Co., Ltd., Dongguan, Guangdong, 523000, China.
| | - Yang Liu
- The Second Affiliated Hospital of Guizhou Medical University, Kaili, Guizhou, 556000, China.
| | - Jinxingyi Wang
- The Second Affiliated Hospital of Guizhou Medical University, Kaili, Guizhou, 556000, China.
| | - Qian Liu
- Guangdong RangerBio Technologies Co., Ltd., Dongguan, Guangdong, 523000, China; The Second Affiliated Hospital of Guizhou Medical University, Kaili, Guizhou, 556000, China.
| | - Min Huang
- Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong, 510080, China.
| | - GuoPing Zhong
- Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong, 510080, China.
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Zhang S, Liu Q, Qu X, Li Q, Wang R, Tian J, Jiang F, Zhu J, Huang M, Bi H. μPESI-MS/MS System for Screening and Quantitating Drugs in Plasma Samples. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2023. [PMID: 37338210 DOI: 10.1021/jasms.3c00025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/21/2023]
Abstract
Recently, we developed a novel microprobe electrospray ionization (μPESI) source and its coupled MS (μPESI-MS/MS) system. Here, we aimed to widely validate the μPESI-MS/MS method for quantitative analysis of drugs in plasma samples. Furthermore, the relationship between the quantitative performance of the μPESI-MS/MS method and the physicochemical properties of target drugs was analyzed. The μPESI-MS/MS methods for quantitative analysis of 5 representative drugs with a relatively wide range of molecular weight, pKa, and log P values were developed and validated. The results showed that the linearity, accuracy, and precision of these methods met the requirements of the European Medicines Agency (EMA) guidance. Then a total of 75 drugs from plasma samples were primarily detected using the μPESI-MS/MS methods, among which 48 drugs could be quantitatively measured. Logistics regression suggested that drugs with significantly greater log P and physiological charge had better quantitative performance using the μPESI-MS/MS method. Collectively, these results clearly demonstrate the practical application of the μPESI-MS/MS system as a rapid approach to the quantitative analysis of drugs in plasma samples.
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Affiliation(s)
- Simin Zhang
- Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong China, 510006
| | - Qian Liu
- Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong China, 510006
- Guangdong RangerBio Technologies Co., Ltd., Dongguan, Guangdong China, 523000
| | - Xiangyang Qu
- Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong China, 510006
| | - Qiaoxi Li
- Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong China, 510006
| | - Ruimin Wang
- Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong China, 510006
| | - Jianing Tian
- Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong China, 510006
| | - Fulin Jiang
- Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong China, 510006
| | - Janshon Zhu
- Guangdong RangerBio Technologies Co., Ltd., Dongguan, Guangdong China, 523000
| | - Min Huang
- Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong China, 510006
| | - Huichang Bi
- Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong China, 510006
- Guangdong Provincial Key Laboratory of New Drug Screening & NMPA Key Laboratory for Research and Evaluation of Drug Metabolism, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, Guangdong China, 510515
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Jiang F, Zhang C, Lu Z, Liu J, Liu P, Huang M, Zhong G. Simultaneous absolute protein quantification of seven cytochrome P450 isoforms in rat liver microsomes by LC-MS/MS-based isotope internal standard method. Front Pharmacol 2022; 13:906027. [PMID: 36059965 PMCID: PMC9428253 DOI: 10.3389/fphar.2022.906027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 07/05/2022] [Indexed: 11/13/2022] Open
Abstract
The cytochrome P450 (CYP) enzymes play a pivotal role in drug metabolism. LC-MS/MS-based targeting technology has been applied to the analysis of CYP enzymes, promoting drug development and drug-drug interaction studies. Rat is one of the most commonly used models for drug metabolism assessment, but LC-MS/MS assay quantifying the abundance of CYP enzymes in rats is rarely reported. Herein, an accurate and stable LC-MS/MS based method was developed and validated for the simultaneous quantification of seven major rat CYP isoforms (CYP1A2, 2B1, 2C6, 2C11, 2D1, 2E1, and 3A1) in liver microsomes. The careful optimization of trypsin digestion and chromatography combined with isotope-labeled peptide as internal standard improved the efficiency and accuracy of the analysis. Highly specific surrogate peptides were obtained by a procedure including trypsin digestion for six hours and separated on a Hypersil Gold C18 column (100 × 2.1 mm, 3 μm) using gradient elution for 15 min with a mobile phase of water containing 0.1% formic acid and acetonitrile. In the method validation, linearity, matrix effect, recovery, stability, accuracy, and precision all meet the requirements. Subsequently, this method was applied to detect seven enzymes in rat liver microsomes from four different sources, and the correlation between the abundance and activity of CYP enzymes was further analyzed. The high-throughput detection method provided in this study will provide support for pertinent pharmaceutical research based on rat models.
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Affiliation(s)
- Fulin Jiang
- Institute of Clinical Pharmacology, Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, China
| | - Chang Zhang
- Institute of Clinical Pharmacology, Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, China
| | - Zihan Lu
- Institute of Clinical Pharmacology, Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, China
| | - Jingyu Liu
- Institute of Clinical Pharmacology, Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, China
| | - Peiqing Liu
- School of Pharmaceutical Sciences, National and Local United Engineering Lab of Druggability and New Drugs Evaluation, Sun Yat-sen University, Guangzhou, China
| | - Min Huang
- Institute of Clinical Pharmacology, Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, China
- *Correspondence: Min Huang, ; Guoping Zhong,
| | - Guoping Zhong
- Institute of Clinical Pharmacology, Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, China
- *Correspondence: Min Huang, ; Guoping Zhong,
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Determination of IQZ23 in rat plasma using LC-MS/MS: consideration for matrix effect and internal standard interference. Bioanalysis 2022; 14:455-465. [PMID: 35484959 DOI: 10.4155/bio-2022-0040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Aim: IQZ23, a novel β-indoloquinazoline derivative, is a potential therapeutic agent for obesity and related metabolic disorders. To assist pharmacokinetics evaluation, a quantitative method for IQZ23 in rat plasma is required. Methods & Results: An LC-MS/MS assay for the determination of IQZ23 in rat plasma was developed and validated for the first time. Chromatographic conditions were optimized to ameliorate matrix effect with direct monitoring of typical phospholipids, including phosphatidylcholine and lysophosphatidylcholine. The structural analog internal standard (SYSU-3d) was set at a proper concentration to avoid analyte sensitivity loss caused by internal standard interference. The well-validated method was employed in the pharmacokinetics study of IQZ23 in Sprague-Dawley rats. Conclusion: This study provided valuable references for the further preclinical study of IQZ23.
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Selective and sensitive UHPLC-ESI-Orbitrap MS method to quantify protein oxidation markers. Talanta 2021; 234:122700. [PMID: 34364496 DOI: 10.1016/j.talanta.2021.122700] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 07/03/2021] [Accepted: 07/06/2021] [Indexed: 11/20/2022]
Abstract
A targeted UHPLC-MS/MS isotopic dilution method has been developed for the simultaneous quantification of 18 different free and protein-bound aromatic amino acid oxidation products in food and biological matrices. All analytes, including critical isomeric pairs of Tyr, o-Tyr, m-Tyr, and dioxyindolylalanine diastereomers were chromatographically resolved to obtain high selectivity, without the need for derivatizing or ion pairing agents. The results of method validation showed adequate retention time reproducibility [0.1-0.6% coefficient of variation (CV) for over 224 injections], accuracy (within ±1-20% of the nominal concentration), and precision (1-17% CV) for all target analytes. The lower limit of quantification was calculated in different matrices using both the Hubaux-Vos approach and accuracy and precision data showing values in the range of 0.2-15 ng/mL. Use of stable isotope-labelled internal standards compensated errors due to matrix effects and artefactual degradation of analytes. Both acid and enzymatic hydrolyses were tested to obtain the best possible results for the quantification of protein oxidation products, demonstrating the stability of target analytes under hydrolytic conditions. The method was successfully applied to quantify target analytes in serum, tissue, milk, infant formula, pork liver pâté, chicken meat and fish. The method was also applied to assess the role of Fenton's reagent in oxidizing Trp, Phe and Tyr residues in different proteins, with results showing o-Tyr, dioxyindolylalanine diastereomers, kynurenine, dityrosine being the main oxidation products. The Fenton chemistry favored the formation of o-Tyr over m-Tyr from Phe with 2-36 folds higher yields. 3-Nitrotyrosine, a marker of protein nitration, was also detected in samples treated with Fenton's reagent.
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Liu FL, Ye TT, Ding JH, Yin XM, Yang XK, Huang WH, Yuan BF, Feng YQ. Chemical Tagging Assisted Mass Spectrometry Analysis Enables Sensitive Determination of Phosphorylated Compounds in a Single Cell. Anal Chem 2021; 93:6848-6856. [PMID: 33882236 DOI: 10.1021/acs.analchem.1c00915] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Polar phosphorylated metabolites are involved in a variety of biological processes and play vital roles in energetic metabolism, cofactor regeneration, and nucleic acid synthesis. However, it is often challenging to interrogate polar phosphorylated metabolites and compounds from biological samples. Liquid chromatography-mass spectrometry (LC/MS) now plays a central role in metabolomic studies. However, LC/MS-based approaches have been hampered by the issues of the low ionization efficiencies, low in vivo concentrations, and less chemical stability of polar phosphorylated metabolites. In this work, we synthesized paired reagents of light and heavy isotopomers, 2-(diazomethyl)phenyl)(9-methyl-1,3,4,9-tetrahydro-2H-pyrido[3,4-b]indol-2-yl)methanone (DMPI) and d3-(2-(diazomethyl)phenyl)(9-methyl-1,3,4,9-tetrahydro-2H-pyrido[3,4-b]indol-2-yl)methanone (d3-DMPI). The paired reagents of DMPI and d3-DMPI carry diazo groups that can efficiently and selectively react with the phosphate group on polar phosphorylated metabolites under mild conditions. As a proof of concept, we found that the transfer of the indole heterocycle group from DMPI/d3-DMPI to ribonucleotides led to the significant increase of ionization efficiencies of ribonucleotides during LC/MS analysis. The detection sensitivities of these ribonucleotides increased by 25-1137-fold upon DMPI tagging with the limits of detection (LODs) being between 7 and 150 amol. With the developed method, we achieved the determination of all the 12 ribonucleotides from a single mammalian cell and from a single stamen of Arabidopsis thaliana. The method provides a valuable tool to investigate the dynamic changes of polar phosphorylated metabolites in a single cell under particular conditions.
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Affiliation(s)
- Fei-Long Liu
- Sauvage Center for Molecular Sciences, Department of Chemistry, Wuhan University, Wuhan 430072, China
| | - Tian-Tian Ye
- Sauvage Center for Molecular Sciences, Department of Chemistry, Wuhan University, Wuhan 430072, China
| | - Jiang-Hui Ding
- Sauvage Center for Molecular Sciences, Department of Chemistry, Wuhan University, Wuhan 430072, China
| | - Xiao-Ming Yin
- Sauvage Center for Molecular Sciences, Department of Chemistry, Wuhan University, Wuhan 430072, China
| | - Xiao-Ke Yang
- Sauvage Center for Molecular Sciences, Department of Chemistry, Wuhan University, Wuhan 430072, China
| | - Wei-Hua Huang
- Sauvage Center for Molecular Sciences, Department of Chemistry, Wuhan University, Wuhan 430072, China
| | - Bi-Feng Yuan
- Sauvage Center for Molecular Sciences, Department of Chemistry, Wuhan University, Wuhan 430072, China.,School of Health Sciences, Wuhan University, Wuhan 430071, China
| | - Yu-Qi Feng
- Sauvage Center for Molecular Sciences, Department of Chemistry, Wuhan University, Wuhan 430072, China.,School of Health Sciences, Wuhan University, Wuhan 430071, China
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Jiang F, Liu Q, Li Q, Zhang S, Qu X, Zhu J, Zhong G, Huang M. Signal Drift in Liquid Chromatography Tandem Mass Spectrometry and Its Internal Standard Calibration Strategy for Quantitative Analysis. Anal Chem 2020; 92:7690-7698. [PMID: 32392405 DOI: 10.1021/acs.analchem.0c00633] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The present project studied the signal drift in liquid chromatography tandem mass spectrometry (LC-MS/MS) and proposed a strategy for compensating such drift. In the study, four 4-component groups were repeatedly run on different LC-MS/MS systems for over 12 h to investigate the dependence of signal drift on time and hardware systems. The 4-component groups each consisted of (1) an analyte, (2) a stable isotope labeled analyte, (3) a compound with similar structure to the analyte, and (4) a compound with dissimilar structure. All of the species showed significant signal drift, generally more than 25% over 12 h. The analyte and its stable isotope labeled analog always have the same drifting pattern including the trends and direction from one LC-MS/MS system to another. Signal drift was also found to be concentration dependent. Our experiments further proved that a conventional stable isotope labeled internal standard in LC-MS/MS quantification would not compensate the variations caused by concentration-dependent signal drift. An ideal internal standard for LC-MS/MS has both identical structure and similar concentration to the analyte. For that, we proposed a new internal standard strategy, pseudo internal standard (Pseudo IS), for LC-MS/MS quantification. Pseudo IS could effectively compensate signal drift in spite of its significant time, system, and concentration dependencies.
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Affiliation(s)
- Fulin Jiang
- Institute of Clinical Pharmacology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510080, China
| | - Qian Liu
- Institute of Clinical Pharmacology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510080, China
| | - Qiaoxi Li
- Institute of Clinical Pharmacology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510080, China
| | - Simin Zhang
- Institute of Clinical Pharmacology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510080, China
| | - Xiangyang Qu
- Institute of Clinical Pharmacology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510080, China
| | - Janshon Zhu
- Guangdong RangerBio Technologies Co., Ltd., Dongguan 523000, China
| | - Guoping Zhong
- Institute of Clinical Pharmacology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510080, China
| | - Min Huang
- Institute of Clinical Pharmacology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510080, China
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Lahr RG, Jannetto PJ, Langman LJ. The challenge that chlorine presented during the development of a benzodiazepine assay. Clin Biochem 2019; 76:38-41. [PMID: 31809697 DOI: 10.1016/j.clinbiochem.2019.11.010] [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: 08/21/2019] [Revised: 11/21/2019] [Accepted: 11/22/2019] [Indexed: 10/25/2022]
Abstract
During the routine validation of a benzodiazepine method (performed on a Liquid Chromatography - Tandem Mass Spectrometer), it was noted that lorazepam, triazolam, and α-hydroxytriazolam showed a quadratic shift/bias in the calibration curve, particularly at high concentrations. The ultimate cause of this bias was determined to be due to the natural presence of chlorine (Cl) isotopes (35Cl and 37Cl) in these benzodiazepines. The presence of the heavy (37Cl) isoforms of Cl resulted in the analyte's mass being the same as the internal standard which, in turn, caused the internal standard to appear "falsely increased", thus skewing the calibration curve. One solution to this potential issue was to take advantage of this natural phenomenon and use the Cl heavy isoforms of the respectively labeled internal standards.
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Affiliation(s)
- Richard G Lahr
- Mayo Clinic, Department of Laboratory Medicine and Pathology, Rochester, MN, United States
| | - Paul J Jannetto
- Mayo Clinic, Department of Laboratory Medicine and Pathology, Rochester, MN, United States
| | - Loralie J Langman
- Mayo Clinic, Department of Laboratory Medicine and Pathology, Rochester, MN, United States.
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