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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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Zhou X, Li N, Sun C, Zhang X, Zhang C, Zhou J, Guan S, Xiao X, Wang Y. Development of a colloidal gold immunochromatographic strip for the rapid detection of pefloxacin in grass carp with a novel pretreatment method. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2022; 57:517-525. [PMID: 35477387 DOI: 10.1080/03601234.2022.2068908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
A rapid colloidal gold immunochromatography assay (GICA) for the detection of pefloxacin (PEF) was established and optimized. The anti-PEF monoclonal antibody (mAb) was used to target PEF as a colloidal gold-mAb conjugate. The mAb belonged to the IgG2b subtype, lambda light chain, the affinity constant (Ka) was 5.21 × 109 L·mol-1, and its half maximal inhibitory concentration (IC50) was 0.23 ng·mL-1. No obvious cross-reactivity (CR) was observed with other common fluoroquinolone antibiotics, including ciprofloxacin (CIP), norfloxacin (NOR), lomefloxacin (LOM) and ofloxacin (OFL). The visual limit of detection (vLOD) of the optimized GICA was 2 ng·g-1 under the conventional pretreatment method, and the assay was completed in 15 min. Liquid chromatography tandem-mass spectrometry (LC-MS/MS) was employed to confirm the performance of the strip. In addition, a novel pretreatment was established and compared with conventional pretreatment. Without the removal of organic solvents, the novel pretreatment method reduced the sample pretreatment time (more than 10 min). The vLOD of the optimized GICA was also 2 ng·g-1 when applying the novel pretreatment method. In conclusion, the proposed PEF-GICA could detect samples containing PEF rapidly and accurately, and the novel pretreatment method saved the time of sample pretreatment and improved the efficiency of detection.
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Affiliation(s)
- Xinghua Zhou
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
| | - Na Li
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
| | - Cheng Sun
- Jiangsu Meizheng Biological Technology Co. Ltd., Wuxi, Jiangsu, China
| | - Xun Zhang
- Jiangsu Meizheng Biological Technology Co. Ltd., Wuxi, Jiangsu, China
| | - Caiqin Zhang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
| | - Jiayu Zhou
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
| | - Shuoning Guan
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
| | - Xiang Xiao
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
| | - Yun Wang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
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3
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Accurate Determination, Matrix Effect Estimation, and Uncertainty Evaluation of Three Sulfonamides in Milk by Isotope Dilution Liquid Chromatography-Tandem Mass Spectrometry. J FOOD QUALITY 2021. [DOI: 10.1155/2021/3910253] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Liquid chromatography-tandem mass spectrometry (LC-MS/MS) is the most commonly used method for sulfonamide determination. Its accuracy, however, can be affected by many factors. In this study, sulfadiazine (SDZ), sulfadimidine (SMZ), and sulfadimethoxine (SDM) in milk were selected to investigate an accurate determination method and the potential influencing factors in the use of ultrahigh-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS). Milk samples were extracted by 25 mL perchloric acid solution (pH = 2) and cleaned up using HLB solid-phase extraction (SPE) cartridges. Four kinds of filters, including PTFE, GHP, nylon, and glass fiber, were compared, and PTFE was selected since it had the best recoveries of target sulfonamides (SAs). Three quantitative methods, including external standard (ES), matrix matching (MM), and isotope dilution mass spectrometry (IDMS), were compared, among which IDMS exhibited the best accuracy. The matrix effect under different mobile phase compositions and of different sample matrices were evaluated and discussed. Ion suppression effects were observed during the determination of all SAs, which got stronger with the increase of the methanol composition percent in the mobile phase. After correction by IDMS, the matrix effect could be neglected. Matrix spiked recoveries at three spiked levels (1 μg/kg, 10 μg/kg, and 20 μg/kg) ranged from 96.8% to 103.8% by IDMS. The expanded relative uncertainties were in the range of 2.02% to 5.75%. The method exhibited wide application range, high accuracy, good stability, and high sensitivity.
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Jeong Y, Kwon HA, Jeon HP, Schäffer A, Smith K. Quantitative evaluation of polyethersulfone and polytetrafluoroethylene membrane sorption in a polar organic chemical integrative sampler (POCIS). ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 266:115224. [PMID: 32698120 DOI: 10.1016/j.envpol.2020.115224] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 07/07/2020] [Accepted: 07/08/2020] [Indexed: 06/11/2023]
Abstract
The lag effect in the polar organic chemical integrative sampler (POCIS) equipped with a polyethersulfone (PES) membrane (POCIS-PES) is a potential limitation for its application in water environments. In this study, a POCIS with a poly(tetrafluoroethylene) (PTFE) membrane (POCIS-PTFE) was investigated for circumventing membrane sorption in order to provide more reliable concentration measurements of organic contaminants. Sampler characteristics such as sampling rates (RS) and sampler-water partition coefficients (KSW) were similar for POCIS-PES and POCIS-PTFE, indicating that partitioning into Oasis HLB as the receiving phase dominates the overall partitioning from the aqueous phase to the POCIS. Membrane sorption was quantified in both laboratory and field experiments. Although POCIS-PTFE showed minor membrane sorption, the PTFE membranes were not robust enough to prevent changes in the sorption of the pollutants to the inner Oasis HLB sorbent due to biofouling. This was reflected in significant ionization effects in the electrospray ionization (ESI) source during the LC-MS/MS analysis. Despite clear differences in the ionization effects, the two POCISs types provided similar time-weighted average (CTWA) concentrations after a two-week passive sampling campaign in surface water and the outflow of a wastewater treatment plant. This study contributes to a more detailed understanding of POCIS application by providing a quantitative evaluation of membrane sorption and its associated effects in the laboratory and field.
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Affiliation(s)
- Yoonah Jeong
- Environmental Safety Group, KIST Europe, Korea Institute of Science and Technology, Campus E7.1, 66123, Saarbrücken, Germany; Institute for Environmental Research, RWTH Aachen University, Worringerweg 1, 52076, Aachen, Germany; Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology, Goyangdaero 283, Goyang-si, 10223, Republic of Korea.
| | - Hyun-Ah Kwon
- Environmental Safety Group, KIST Europe, Korea Institute of Science and Technology, Campus E7.1, 66123, Saarbrücken, Germany; Division of Energy & Environment Technology, University of Science and Technology, Daejeon, 34113, Republic of Korea
| | - Hyun Pyo Jeon
- Environmental Safety Group, KIST Europe, Korea Institute of Science and Technology, Campus E7.1, 66123, Saarbrücken, Germany
| | - Andreas Schäffer
- Institute for Environmental Research, RWTH Aachen University, Worringerweg 1, 52076, Aachen, Germany
| | - Kilian Smith
- Institute for Environmental Research, RWTH Aachen University, Worringerweg 1, 52076, Aachen, Germany; Department of Water, Environment, Construction and Safety, University of Applied Sciences Magdeburg-Stendal, Breitscheidstr. 2, 39114, Magdeburg, Germany
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5
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Derayea SM, Ahmed AB, Omar MA, Abdelwahab NS, Abdelrahman MM. The convenient use of fluorescamine for spectrofluorimetric quantitation of pramipexole in pure form and pharmaceutical formulation; application to content uniformity testing. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 238:118414. [PMID: 32413715 DOI: 10.1016/j.saa.2020.118414] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 04/22/2020] [Accepted: 04/24/2020] [Indexed: 06/11/2023]
Abstract
Pramipexole is a selective dopamine receptor agonist which is used in the treatment of Parkinson's disease and restless legs syndrome. The present work illustrates the development and validation of a sensitive and selective spectrofluorometric method for quantitation of pramipexole (PMP) through its interaction with fluorescamine at pH 7.5 using aqueous borate buffer to produce a highly fluorescent product. The fluorescent intensity of the formed product was measured at 480 nm after excitation at 391 nm. Experimental factors that could influence the formation, stability and the fluorescence intensity of the formed product were investigated and optimized. The linearity of the proposed method was achieved in the concentration range of 0.05-2.0 μg/mL. The quantitation and detection limits were 47 and 15 ng/mL, respectively. The proposed method has been validated in respect to guidelines of ICH and pharmaceutical tablets of PMP were successfully analyzed. Moreover, the method was applied for studying the content uniformity test according to the guidelines of United States Pharmacopeia.
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Affiliation(s)
- Sayed M Derayea
- Analytical Chemistry, Faculty of Pharmacy, Minia University, Minia, Egypt
| | - Amal B Ahmed
- Pharmaceutical Chemistry, Faculty of Pharmacy, Nahda University, 62514 Beni-Suef, Egypt.
| | - Mahmoud A Omar
- Analytical Chemistry, Faculty of Pharmacy, Minia University, Minia, Egypt; Pharmacognosy and Pharmaceutical Chemistry Department, College of Pharmacy, Taibah University, Medinah, Saudi Arabia
| | - Nada S Abdelwahab
- Pharmaceutical Chemistry, Faculty of Pharmacy, Nahda University, 62514 Beni-Suef, Egypt; Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Beni-Suef University, 62514 Beni-Suef, Egypt
| | - Maha M Abdelrahman
- Pharmaceutical Chemistry, Faculty of Pharmacy, Nahda University, 62514 Beni-Suef, Egypt; Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Beni-Suef University, 62514 Beni-Suef, Egypt
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6
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Strategies for effective development of ultra-sensitive LC–MS/MS assays: application to a novel STING agonist. Bioanalysis 2020; 12:467-484. [DOI: 10.4155/bio-2020-0038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Background: The continual need for the development and validation of ultra-sensitive (low pg/ml) LC–MS/MS assays in the pharmaceutical industry is largely driven by the ultra-low analyte exposure or very low sample volume. Methodology: Strategies and systematic approaches for sensitivity enhancement are provided which cover all aspects of a LC–MS/MS bioanalysis. A case study where such strategies were applied for the validation of a 5.0 pg/ml assay for a STING agonist is discussed. Conclusion: Analytical protocols were developed to extract analytes from large volume of plasma samples (600 and 400 μl) with high throughput. The guidance provided in this publication can serve as a resource to influence LC–MS/MS method development activities.
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7
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Chen Z, Gao Y, Zhong D. Technologies to improve the sensitivity of existing chromatographic methods used for bioanalytical studies. Biomed Chromatogr 2020; 34:e4798. [PMID: 31994210 DOI: 10.1002/bmc.4798] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 01/10/2020] [Accepted: 01/24/2020] [Indexed: 12/16/2022]
Abstract
Chromatographic method has long been recognized as the most widely used separation method in bioanalytical research. However, the relatively low sensitivity of existing chromatographic methods remains a significant challenge, as the requirements for experimental procedures become more demanding. This review discusses the main causes for the low sensitivity of chromatographic methods and aims to introduce different technologies for enhancing their sensitivity in the following aspects: (i) different pretreatment methods for improving clean-up efficiency and recovery; (ii) derivatization step for altering the chromatographic behavior of analytes and enhancing MS ionization efficiency; (iii) optimal LC-MS conditions and appropriate separation mechanism; and (iv) applications of other chromatographic methods, including miniaturized LC, 2D-LC, 2D-GC, and supercritical fluid chromatography. Altogether, this review is devoted to summarizing the recent technologies reported in the literature and providing new strategies for the detection of bioanalytes.
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Affiliation(s)
- Zhendong Chen
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Yuxiong Gao
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Dafang Zhong
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.,University of Chinese Academy of Sciences, Beijing, China
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8
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Woźnica M, Luliński P. Design of selective molecularly imprinted sorbent for the optimized solid-phase extraction of S-pramipexole from the model multicomponent sample of human urine. J Sep Sci 2019; 42:1412-1422. [PMID: 30681270 DOI: 10.1002/jssc.201801101] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2018] [Revised: 01/15/2019] [Accepted: 01/16/2019] [Indexed: 01/04/2023]
Abstract
The objective of this article was to design the selective molecularly imprinted sorbent dedicated to the solid-phase extraction of S-pramipexole from the complex matrix such as human urine. For that purpose, S-2,6-diamino-4,5,6,7-tetrahydrobenzothiazole was used as the template acting as the structural analog of S-pramipexole and five various monomers were employed in the presence of ethylene glycol dimethacrylate to produce molecularly imprinted polymers. The binding capabilities of resulted polymers revealed that the highest imprinting effect was noted for polymer prepared from the itaconic acid. The comprehensive analysis of morphology and the characterization of binding sites showed not only negligible differences in the extension of surfaces of imprinted and nonimprinted polymers but also higher heterogeneity of binding sites in the imprinted material. Comprehensive optimization of the molecularly imprinted solid-phase extraction allowed to select the most appropriate solvents for loading, washing, and elution steps. Subsequent optimization of mass of sorbent and volumes of solvents allowed to achieve satisfactory total recoveries of S-pramipexole from the model multicomponent real sample of human urine that equals to 91.8 ± 3.2% for imprinted sorbent with comparison to only 37.1 ± 1.1% for Oasis MCX.
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Affiliation(s)
- Marcin Woźnica
- Department of Organic Chemistry, Faculty of Pharmacy, Medical University of Warsaw, Warsaw, Poland
| | - Piotr Luliński
- Department of Organic Chemistry, Faculty of Pharmacy, Medical University of Warsaw, Warsaw, Poland
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9
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Mohamed D, Hegazy MA, Elshahed MS, Toubar SS, Helmy MI. Novel contribution to the simultaneous monitoring of pramipexole dihydrochloride monohydrate and levodopa as co-administered drugs in human plasma utilizing UPLC-MS/MS. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2018; 24:397-407. [PMID: 30012017 DOI: 10.1177/1469066718788800] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
An efficient, selective, sensitive, and rapid ultra-performance liquid chromatography tandem mass spectrometry method was established and validated for the quantification of pramipexole dihydrochloride monohydrate and levodopa simultaneously in human plasma with the aid of diphenhydramine as an internal standard. A simple protein precipitation technique with HPLC grade acetonitrile was efficiently utilized for the cleanup of plasma. The analysis was performed using a Hypersil gold 50 mm × 2.1 mm (1.9 µm) column and a mobile phase of 0.2% formic acid and methanol (90: 10 v/v). The triple-quadrupole mass spectrometer equipped with an electrospray source operated in the positive mode was set up in the selective reaction monitoring mode (SRM) to detect the ion transitions m/z 212.15 →153.01, m/z 198.10→ 135.16, and m/z 255.75 → 166.16 for pramipexole dihydrochloride monohydrate, levodopa, and diphenhydramine, respectively. The method was thoroughly validated according to FDA guidelines and proved to be linear, accurate, and precise over the range 100-4000 pg/mL for pramipexole dihydrochloride monohydrate and 60-4000 ng/mL for levodopa. The proposed method was effectively applied for monitoring both drugs in plasma samples of healthy volunteers.
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Affiliation(s)
- Dalia Mohamed
- 1 Analytical Chemistry Department, Faculty of Pharmacy, Helwan University, Cairo, Egypt
- 2 Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, October University for Modern Sciences and Arts, 6 October City, Egypt
| | - Maha A Hegazy
- 3 Analytical Chemistry Department, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Mona S Elshahed
- 1 Analytical Chemistry Department, Faculty of Pharmacy, Helwan University, Cairo, Egypt
| | - Safaa S Toubar
- 1 Analytical Chemistry Department, Faculty of Pharmacy, Helwan University, Cairo, Egypt
| | - Marwa I Helmy
- 1 Analytical Chemistry Department, Faculty of Pharmacy, Helwan University, Cairo, Egypt
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10
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Hu Y, Zhu W, Guan Y, Wu S, Zhang X, Li G, Si L, Huang J. Accurate determination of a novel vasodilatory β-blocker TJ0711 using LC-MS/MS: Resolution of an isobaric metabolite interference in dog plasma. Biomed Chromatogr 2018; 32:e4196. [PMID: 29357403 DOI: 10.1002/bmc.4196] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2017] [Revised: 01/08/2018] [Accepted: 01/12/2018] [Indexed: 01/14/2023]
Abstract
A rapid, robust and sensitive liquid chromatography-tandem mass spectrometry method was developed and validated for bioanalysis of TJ0711, a novel vasodilatory β-blocker in dog plasma. This assay is able to chromatographically separate TJ0711 from its isobaric metabolite as well as glucuronide conjugates. Chromatographic separation was achieved on a Welch Ultimate-XB C18 column (2.1 × 100 mm, 3 μm). The analyte and internal standard (propranolol) were extracted from plasma by liquid-liquid extraction using ethyl acetate. The mass spectrometric detection was carried out in positive ion multiple reaction monitoring mode. Good linearity was obtained over the concentration range of 0.5-500 ng/mL (r > 0.99) for TJ0711. Moreover, the method had good accuracy (RE ranging from -2.70 to -0.32%) and precision (RSD < 7.55%). TJ0711 was stable in dog plasma for at least 6 h at ambient temperature, for at least 30 days at -20°C and after three freeze-thaw cycles. This method was successfully applied to a preclinical pharmacokinetic study and the results demonstrated linear pharmacokinetics of TJ0711 over a dose range from 0.03 to 0.3 mg/kg. No significant gender differences were observed in TJ0711 plasma pharmacokinetic parameters.
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Affiliation(s)
- Yang Hu
- Department of Pharmaceutics, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Wenwen Zhu
- Department of Pharmaceutics, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yeli Guan
- Department of Pharmaceutics, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Sanlan Wu
- Department of Pharmacy, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Xiaoyin Zhang
- Department of Pharmaceutics, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Gao Li
- Department of Pharmaceutics, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Luqin Si
- Department of Pharmaceutics, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jiangeng Huang
- Department of Pharmaceutics, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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11
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Medvedovici A, Bacalum E, David V. Sample preparation for large-scale bioanalytical studies based on liquid chromatographic techniques. Biomed Chromatogr 2017; 32. [DOI: 10.1002/bmc.4137] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 10/24/2017] [Accepted: 10/27/2017] [Indexed: 12/30/2022]
Affiliation(s)
- Andrei Medvedovici
- Faculty of Chemistry, Department of Analytical Chemistry; University of Bucharest; Bucharest Romania
| | - Elena Bacalum
- Research Institute; University of Bucharest; Bucharest Romania
| | - Victor David
- Faculty of Chemistry, Department of Analytical Chemistry; University of Bucharest; Bucharest Romania
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12
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LC–MS/MS assay of ropinirole in rat biological matrices: elimination of lysoglycerophosphocholines-based matrix effect. Bioanalysis 2016; 8:1823-35. [DOI: 10.4155/bio-2016-0087] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Aim: To adequately support PK evaluation of ropinirole in rats following intranasal administration, it was desirable to determine ropinirole concentrations in rat plasma, brain homogenate and microdialysate. Results & methodology: A robust LC–MS/MS method has been developed for the determination of ropinirole in biological samples. Liquid–liquid extraction using ethyl acetate eliminated matrix effect due to significantly reduced levels of lysoglycerophosphocholines. The assay was fully validated with dynamic ranges of 0.01–20 ng/ml for plasma and brain homogenate samples and 0.1–200 ng/ml for microdialysate samples. Conclusion: The proposed method was accurate and precise for the quantification of ropinirole in biological samples and was successfully applied to a microdialysis study of ropinirole in rats.
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13
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Li DQ, Zhang ZQ, Yang XL, Zhou CH, Qi JL. Online restricted-access material combined with high-performance liquid chromatography and tandem mass spectrometry for the simultaneous determination of vanillin and its vanillic acid metabolite in human plasma. J Sep Sci 2016; 39:3318-26. [PMID: 27384745 DOI: 10.1002/jssc.201600466] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Revised: 06/16/2016] [Accepted: 06/29/2016] [Indexed: 12/15/2022]
Affiliation(s)
- De-qiang Li
- Department of Pharmacy; The Second Hospital of Hebei Medical University; Shijiazhuang Hebei China
| | - Zhi-qing Zhang
- Department of Pharmacy; The Second Hospital of Hebei Medical University; Shijiazhuang Hebei China
| | - Xiu-ling Yang
- Department of Pharmacy; The Second Hospital of Hebei Medical University; Shijiazhuang Hebei China
| | - Chun-hua Zhou
- Department of Pharmacy; The Second Hospital of Hebei Medical University; Shijiazhuang Hebei China
| | - Jin-long Qi
- Department of Pharmacology; Hebei Medical University; Shijiazhuang Hebei China
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