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Hafez HM, Barghash SS, Soliman MM, Soltan MK, Abd Elrahman M, Katamesh NS. Central composite design driven optimization of sustainable stability indicating HPLC method for the determination of Tigecycline and greenness assessment. F1000Res 2023; 12:341. [DOI: 10.12688/f1000research.130861.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 09/02/2023] Open
Abstract
Background: Tigecycline (TGC) is a recently developed antibiotic to battle resistant bacteria. The procedures outlined in the literature for analyzing TGC involve chemical solvents that could be hazardous. Therefore, this study aimed to create a sustainable and stable HPLC technique for quantifying Tigecycline in lyophilized powder. The powerful chemometric tool, experimental design (ED), will be applied to analyze the variables' interaction and impact on the selected analytical target profiles. Response surface methodology provides a tutorial on using the central composite design with three levels of variables and quadratic programming to optimize the design space of the developed method. Methods: The New HPLC method consisted of an aqueous buffer and ethanol as a green mobile phase run on a reversed-phase symmetry C18 column. A full resolution between the Tigecycline and its degradation product peaks was achieved in a short analytical runtime. Results: Further, the specificity, accuracy, precision, robustness and stability indicating power of the proposed approach were verified through stress degrading testing. Conclusions: Finally, the analytical eco-scale and the green Analytical Procedure Index (GAPI) were utilized to determine how environmentally friendly the recommended method was compared to other published approaches.
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Hafez HM, Barghash SS, Soliman MM, Soltan MK, Abd Elrahman M, Katamesh NS. Central composite design driven optimization of sustainable stability indicating HPLC method for the determination of Tigecycline and greenness assessment. F1000Res 2023; 12:341. [PMID: 37593362 PMCID: PMC10427804 DOI: 10.12688/f1000research.130861.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 07/25/2023] [Indexed: 08/19/2023] Open
Abstract
Background: Tigecycline (TGC) is a recently developed antibiotic to battle resistant bacteria. The procedures outlined in the literature for analyzing TGC involve chemical solvents that could be hazardous. Therefore, this study aimed to create a sustainable and stable HPLC technique for quantifying Tigecycline in lyophilized powder. The powerful chemometric tool, experimental design (ED), will be applied to analyze the variables' interaction and impact on the selected analytical target profiles. Response surface methodology provides a tutorial on using the central composite design with three levels of variables and quadratic programming to optimize the design space of the developed method. Methods: The New HPLC method consisted of an aqueous buffer and ethanol as a green mobile phase run on a reversed-phase symmetry C18 column. A full resolution between the Tigecycline and its degradation product peaks was achieved in a short analytical runtime. Results: Further, the specificity, accuracy, precision, robustness and stability indicating power of the proposed approach were verified through stress degrading testing. Conclusions: Finally, the analytical eco-scale and the green Analytical Procedure Index (GAPI) were utilized to determine how environmentally friendly the recommended method was compared to other published approaches.
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Affiliation(s)
- Hani Mohammed Hafez
- Pharmaceutical Chemistry Department, College of Pharmacy, Al-Esraa University, Baghdad, 10045, Iraq
| | - Sona Soliman Barghash
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy (Girls), Al-Azhar University, Cairo, Egypt
| | - Marwa M. Soliman
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy (Girls), Al-Azhar University, Cairo, Egypt
| | - Moustafa K. Soltan
- Pharmacy Department, Oman College of health sciences, Muscat, Muscat, Oman
- Medicinal Chemistry Department, Faculty of Pharmacy, Zagazig University, Zagazig, Sharqia, Egypt
| | | | - Noha Salah Katamesh
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy (Girls), Al-Azhar University, Cairo, Egypt
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Yan Y, Qu J, Di Y, Zhang C, Cheng X. Measurement of tigecycline in dried blood spots by LC-MS/MS and comparison tigecycline concentrations between whole blood and plasma. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2023; 37:e9416. [PMID: 36226756 DOI: 10.1002/rcm.9416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 09/26/2022] [Accepted: 10/04/2022] [Indexed: 06/16/2023]
Abstract
RATIONALE An LC-MS/MS method was established to measure tigecycline in dried blood spots (DBSs). METHODS The DBS specimens obtained by applying 30 μl of blood to filter paper were extracted with hydrogen oxide and subsequently precipitated protein with perchloric acid, then the extract was directly analyzed by liquid chromatography tandem mass spectrometry. A Hypersil GOLD aQ column was utilized for separating the analytes, and detection was carried out in positive and selective reaction monitoring modes. The precursors to product ion transitions m/z 586.3 → 513.1 and m/z 586.3 → 569.2 were monitored for tigecycline, and m/z 473.2 → 456.0 and m/z 473.2 → 367.0 for 9-amino minocycline as internal standard. RESULTS The validation parameters of specificity and selectivity, linearity (0.02-5 μg ml-1 ), sensitivity (limit of quantification 0.02 μg ml-1 ), intra- and interday precision (within 15%) and relative error (within ±15%) were acceptable. The recoveries were from 84.65% to 90.49% and from 85.41% to 95.72% for tigecycline and internal standard, respectively, and the matrix effect was not evident to influence accuracy. The impact of hematocrit on measurement of the analyte was negligible, and after preserving at ambient temperature for 24 h and at 4°C for 1 month it remained steady. CONCLUSIONS The advantages of nonintrusive blood collection and micro-volume sample requirements make DBS a potent surrogate to conventional venepuncture for sampling.
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Affiliation(s)
- Yan Yan
- Department of Pharmacy, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Jie Qu
- Department of Clinical Laboratory, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Ying Di
- Department of Hepatobiliary Surgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Chun Zhang
- Department of Hepatobiliary Surgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Xiaoliang Cheng
- Department of Pharmacy, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
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Concurrent Determination of Tigecycline, Tetracyclines and Their 4-Epimer Derivatives in Chicken Muscle Isolated from a Reversed-Phase Chromatography System Using Tandem Mass Spectrometry. Molecules 2022; 27:molecules27196139. [PMID: 36234676 PMCID: PMC9571846 DOI: 10.3390/molecules27196139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 09/13/2022] [Accepted: 09/15/2022] [Indexed: 11/16/2022] Open
Abstract
A quantitative and qualitative method using a high-performance liquid chromatography–tandem mass spectrometry (HPLC–MS/MS) detection approach was developed and validated for the analysis of tigecycline, four tetracyclines and their three 4-epimer derivatives in chicken muscle. Samples were extracted repeatedly with 0.1 mol/L Na2EDTA–McIlvaine buffer solution. After vortexing, centrifugation, solid-phase extraction, evaporation and reconstitution, the aliquots were separated using a C8 reversed-phase column (50 mm × 2.1 mm, 5 µm) with a binary solvent system consisting of methanol and 0.01 mol/L trichloroacetic acid aqueous solution. The typical validation parameters were evaluated in accordance with the acceptance criteria detailed in the guidelines of the EU Commission Decision 2002/657/EC and the U.S. Food and Drug Administration Bioanalytical Method Validation 05/24/18. The matrix-matched calibration curve was linear over the concentration range from the limit of quantitation (LOQ) to 400 μg/kg for doxycycline, and the calibration graphs for tetracycline, chlortetracycline, oxytetracycline, their 4-epimer derivatives and tigecycline showed a good linear relationship within the concentration range from the LOQ to 200 μg/kg. The limits of detection (LODs) for the eight targets were in the range of 0.06 to 0.09 μg/kg, and the recoveries from the fortified blank samples were in the range of 89% to 98%. The within-run precision and between-run precision, which were expressed as the relative standard deviations, were less than 5.0% and 6.9%, respectively. The applicability was successfully demonstrated through the determination of residues in 72 commercial chicken samples purchased from different sources. This approach provides a novel option for the detection of residues in animal-derived food safety monitoring.
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Zhong X, Zhang X, Zhou T, Lv G, Zhao Q. Exploring kinetics, removal mechanism and possible transformation products of tigecycline by Chlorella pyrenoidosa. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 817:152988. [PMID: 35026238 DOI: 10.1016/j.scitotenv.2022.152988] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 01/03/2022] [Accepted: 01/05/2022] [Indexed: 06/14/2023]
Abstract
The accumulation of antibiotics in wastewater leads to broad antibiotic resistance, threating human health. Microalgae have been receiving attention due to their ability to remove antibiotics from wastewater. Tigecycline (TGC) is a broad-spectrum glycylcycline antibiotic. It has not been investigated for removal by microalgae. The removal kinetics of TGC by Chlorella pyrenoidosa were evaluated under different initial dry cell densities, TGC concentrations, temperatures and light intensity conditions. Approximately 90% of TGC could be removed when the TGC concentration was 10 mg∙L-1 and the initial dry cell density was more than 0.2 g∙L-1. A low value of TGC per g dry cell weight ratio led to a high removal efficiency of TGC. The initial dry cell density of microalgae was also critical for the removal of TGC. A high initial dry cell density is better than a low initial dry cell density to remove TGC when the ratio of the TGC concentration to dry cell weight are the same at the beginning of the cultivation. The removal mechanisms were investigated. Photolysis was a slow process that did not lead to removal at the beginning. Adsorption, hydrolysis, photolysis and biodegradation by microalgae were the main contributors to the removal of TGC. TGC was easily hydrolyzed under high -temperature conditions. Three transformation products of TGC by microalgae were identified. The stability of TGC was evaluated in water and salt solutions of citric acid, K2HPO4·3H2O and ferric ammonium citrate. TGC was stable in ultrapure water and citric acid solution. TGC was hydrolyzed in K2HPO4·3H2O and ferric ammonium citrate solutions.
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Affiliation(s)
- Xueqing Zhong
- School of Pharmaceutical Science, Nanjing Tech University, No. 30 Puzhu South Road, Nanjing 211816, People's Republic of China
| | - Xiangxiang Zhang
- School of Pharmaceutical Science, Nanjing Tech University, No. 30 Puzhu South Road, Nanjing 211816, People's Republic of China
| | - Tianyi Zhou
- School of Pharmaceutical Science, Nanjing Tech University, No. 30 Puzhu South Road, Nanjing 211816, People's Republic of China
| | - Guangping Lv
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, 2 Xuelin Road, Nanjing 210023, People's Republic of China
| | - Quanyu Zhao
- School of Pharmaceutical Science, Nanjing Tech University, No. 30 Puzhu South Road, Nanjing 211816, People's Republic of China.
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Benzydamine Reverses TMexCD-TOprJ-Mediated High-Level Tigecycline Resistance in Gram-Negative Bacteria. Pharmaceuticals (Basel) 2021; 14:ph14090907. [PMID: 34577607 PMCID: PMC8470189 DOI: 10.3390/ph14090907] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 09/02/2021] [Indexed: 12/15/2022] Open
Abstract
Recently, a novel efflux pump gene cluster called tmexCD1-toprJ1 and its variants have been identified, which undermine the antibacterial activity of tigecycline, one of the last remaining options effective against multidrug-resistant (MDR) Gram-negative bacteria. Herein, we report the potent synergistic effect of the non-steroidal anti-inflammatory drug benzydamine in combination with tigecycline at sub-inhibitory concentrations against various temxCD-toprJ-positive Gram-negative pathogens. The combination of benzydamine and tigecycline killed all drug-resistant pathogens during 24 h of incubation. In addition, the evolution of tigecycline resistance was significantly suppressed in the presence of benzydamine. Studies on the mechanisms of synergism showed that benzydamine disrupted the bacterial proton motive force and the functionality of this kind of novel plasmid-encoded resistance-nodulation-division efflux pump, thereby promoting the intracellular accumulation of tigecycline. Most importantly, the combination therapy of benzydamine and tigecycline effectively improved the survival of Galleria mellonella larvae compared to tigecycline monotherapy. Our findings provide a promising drug combination therapeutic strategy for combating superbugs carrying the tmexCD-toprJ gene.
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Establishment and Validation of a Liquid Chromatography-Tandem Mass Spectrometry Method for the Determination of Tigecycline in Critically Ill Patients. Int J Anal Chem 2020; 2020:6671392. [PMID: 33456470 PMCID: PMC7785388 DOI: 10.1155/2020/6671392] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2020] [Accepted: 12/03/2020] [Indexed: 12/23/2022] Open
Abstract
Utilizing tigecycline-d9 as an internal standard (IS), we establish and validate a simple, effective, and rapid liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for the quantitative measurement of tigecycline (TGC) in patient plasma. Acetonitrile was used as a precipitant to process plasma samples by a protein precipitation method. The analyte and IS were separated on an HSS T3 (2.1 × 100 mm, 3.5 μm) chromatographic column using isocratic program with a mobile phase comprising of 80% solvent A (water containing 0.1% formic acid (v/v) with 5 mM ammonium acetate) and 20% solvent B (acetonitrile) with a flow rate of 0.3 mL/min. The mass spectrometer, scanning in multireaction monitoring (MRM) mode and using an electrospray ion source (ESI), operated in the positive-ion mode. The ion pairs used for quantitative analysis were m/z 586.4 ⟶ 513.3 and m/z 595.5 ⟶ 514.3 for TGC and the IS, respectively. The range of the linear calibration curve obtained with this approach was 50–5000 ng/ml. Intra- and interbatch precision for TGC quantitation were less than 7.2%, and the accuracy ranged from 93.4 to 101.8%. The IS-normalized matrix effect was 87 to 104%. Due to its high precision and accuracy, this novel method allows for fast quantitation of TGC with a total analysis time of 2 min. This approach was effectively applied to study the pharmacokinetics of TGC in critically ill adult patients.
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Shao R, Li X, Hu Y, Chen J, Lou H, Dai H. Determination of tigecycline in human plasma by LC-MS/MS and its application to population pharmacokinetics study in Chinese patients with hospital-acquired pneumonia. Biomed Chromatogr 2017; 32. [PMID: 28677837 DOI: 10.1002/bmc.4045] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 06/14/2017] [Accepted: 06/30/2017] [Indexed: 12/23/2022]
Abstract
A selective, sensitive and rapid liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed and validated for the determination of tigecycline (TGC) in human plasma, using tigecycline-d9 as an internal standard (IS). Analytical samples were prepared using a protein precipitation method coupled with a concentration process. The analyte and IS were separated on a reversed-phase Waters Acquity UPLC® BEH-C18 column (2.1 × 50 mm i.d., 1.7 μm) with a flow rate of 0.25 mL/min. The mobile phase consisted of water, containing 0.2% formic acid (v/v) with 10 mm ammonium formate (A) and acetonitrile (B). The mass spectrometer was operated in selected reaction monitoring mode through electrospray ionization ion mode using the transitions of m/z 586.2 → 513.1 and m/z 595.1 → 514.0 for TGC and IS, respectively. The linearity of the method was in the range of 10-5000 ng/mL. Intra- and inter-batch precision (CV) for TGC was <9.27%, and the accuracy ranged from 90.06 to 107.13%. This method was successfully applied to the analysis of samples from hospital-acquired pneumonia patients treated with TGC, and a validated population pharmacokinetic model was established. This developed method could be useful to predict pharmacokinetics parameters and valuable for further pharmacokinetics/pharmacodynamics studies.
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Affiliation(s)
- Rong Shao
- Center of Clinical Pharmacology, the Second Affiliated Hospital, Zhejiang University, School of Medicine, Hangzhou, China
| | - Xingang Li
- Department of Pharmacy, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Yangmin Hu
- Department of Pharmacy, the Second Affiliated Hospital, Zhejiang University, School of Medicine, Hangzhou, China
| | - Jinliang Chen
- Center of Clinical Pharmacology, the Second Affiliated Hospital, Zhejiang University, School of Medicine, Hangzhou, China
| | - Honggang Lou
- Center of Clinical Pharmacology, the Second Affiliated Hospital, Zhejiang University, School of Medicine, Hangzhou, China
| | - Haibin Dai
- Department of Pharmacy, the Second Affiliated Hospital, Zhejiang University, School of Medicine, Hangzhou, China
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Jasiecka-Mikołajczyk A, Ziółkowski H, Jaroszewski JJ. Pharmacokinetics of tigecycline in turkeys following different routes of administration. J Vet Pharmacol Ther 2017; 41:e22-e29. [PMID: 28833289 DOI: 10.1111/jvp.12447] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Accepted: 07/14/2017] [Indexed: 11/27/2022]
Abstract
The aim of this research had been to determine the pharmacokinetics of tigecycline (TIG) in turkey after intravenous (i.v.), intramuscular (i.m.), subcutaneous (s.c.), and oral (p.o.) administration at a dose of 10 mg/kg. TIG concentrations in plasma were determined using high-performance liquid chromatography with tandem mass spectrometry. Mean concentrations of TIG in turkey plasma in the i.v. group were significantly higher than concentrations of this drug obtained after using the other administration routes. No significant differences were demonstrated in respect to the concentrations achieved after i.m. and s.c. administration. The bioavailability of TIG after i.m., s.c., and p.o. administration was 32.59 ± 5.99%, 34.91 ± 9.62%, and 0.97 ± 0.57%, respectively. Values of half-life in the elimination phase were 23.49 ± 6.51 hr, 25.42 ± 4.42 hr, and 26.62 ± 5.19 hr in i.v., i.m., and s.c. groups, respectively, values of mean residence time were 7.92 ± 1.41 hr, 19.62 ± 2.82 hr, and 17.55 ± 2.59 hr in i.v., i.m., and s.c. groups, respectively, whereas the volume of distribution was 14.85 ± 5.71 L/kg, 14.68 ± 2.56 L/kg, and 15.37 ± 3.00 L/kg in i.v., i.m., and s.c. groups, respectively. Because TIG is not absorbed from the gastrointestinal tract in turkeys to a clinically significant degree, this drug given p.o. could find application in commercial turkey farms only to treat gastrointestinal tract infections.
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Affiliation(s)
- A Jasiecka-Mikołajczyk
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, University of Warmia and Mazury, Olsztyn, Poland
| | - H Ziółkowski
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, University of Warmia and Mazury, Olsztyn, Poland
| | - J J Jaroszewski
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, University of Warmia and Mazury, Olsztyn, Poland
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Population Pharmacokinetics of Tigecycline in Critically Ill Patients with Severe Infections. Antimicrob Agents Chemother 2017; 61:AAC.00345-17. [PMID: 28607024 DOI: 10.1128/aac.00345-17] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2017] [Accepted: 05/13/2017] [Indexed: 11/20/2022] Open
Abstract
We sought to describe the population pharmacokinetics of tigecycline in critically ill patients and to determine optimized dosing regimens of tigecycline for different bacterial infections. This prospective study included 10 critically ill patients given a standard dose of tigecycline. Blood samples were collected during one dosing interval and were analyzed using validated chromatography. Population pharmacokinetics and Monte Carlo dosing simulations were undertaken using Pmetrics. Three target exposures, expressed as ratios of the 24-h area under the curve to MICs (AUC0-24/MIC), were evaluated (≥17.9 for skin infections, ≥6.96 for intra-abdominal infections, ≥4.5 for hospital-acquired pneumonia). The median age, total body weight, and body mass index (BMI) were 67 years, 69.1 kg, and 24.7 kg/m2, respectively. A two-compartment linear model best described the time course of tigecycline concentrations. The parameter estimates (expressed as means ± standard deviations [SD]) from the final model were as follows: clearance (CL), 7.50 ± 1.11 liters/h; volume in the central compartment, 72.50 ± 21.18 liters; rate constant for tigecycline distribution from the central to the peripheral compartment, 0.31 ± 0.16 h-1; and rate constant for tigecycline distribution from the peripheral to the central compartment, 0.29 ± 0.30 h-1 A larger BMI was associated with increased CL of tigecycline. Licensed doses were found to be sufficient for Enterobacter cloacae, Escherichia coli, Klebsiella pneumoniae, and methicillin-resistant Staphylococcus aureus for an AUC0-24/MIC target of 4.5 or 6.96. For a therapeutic target of 17.9, an increased tigecycline dose is required, especially for patients with higher BMI. The dosing requirements of tigecycline differ with the indication, with pathogen susceptibility, and potentially with patient BMI.
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Munyeza CF, Shobo A, Baijnath S, Bratkowska D, Naiker S, Bester LA, Singh SD, Maguire GEM, Kruger HG, Naicker T, Govender T. Development and validation of a liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for the quantification of tigecycline in rat brain tissues. Biomed Chromatogr 2015; 30:837-45. [DOI: 10.1002/bmc.3616] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2015] [Revised: 07/23/2015] [Accepted: 09/14/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Chiedza F. Munyeza
- Catalysis and Peptide Research Unit; University of KwaZulu-Natal; Westville Campus Durban 4000 South Africa
| | - Adeola Shobo
- Catalysis and Peptide Research Unit; University of KwaZulu-Natal; Westville Campus Durban 4000 South Africa
| | - Sooraj Baijnath
- Catalysis and Peptide Research Unit; University of KwaZulu-Natal; Westville Campus Durban 4000 South Africa
| | - Dominika Bratkowska
- Catalysis and Peptide Research Unit; University of KwaZulu-Natal; Westville Campus Durban 4000 South Africa
| | - Suhashni Naiker
- Catalysis and Peptide Research Unit; University of KwaZulu-Natal; Westville Campus Durban 4000 South Africa
| | - Linda A. Bester
- Biomedical Resource Unit; University of KwaZulu-Natal; Westville Campus Durban 4000 South Africa
| | - Sanil D. Singh
- Biomedical Resource Unit; University of KwaZulu-Natal; Westville Campus Durban 4000 South Africa
| | - Glenn E. M. Maguire
- Catalysis and Peptide Research Unit; University of KwaZulu-Natal; Westville Campus Durban 4000 South Africa
| | - Hendrik G. Kruger
- Catalysis and Peptide Research Unit; University of KwaZulu-Natal; Westville Campus Durban 4000 South Africa
| | - Tricia Naicker
- Catalysis and Peptide Research Unit; University of KwaZulu-Natal; Westville Campus Durban 4000 South Africa
| | - Thavendran Govender
- Catalysis and Peptide Research Unit; University of KwaZulu-Natal; Westville Campus Durban 4000 South Africa
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Wang X, Liu X, Cai H, Pei K, Cao G, Xu X, Shi F, Cai B. Ultra high performance liquid chromatography with tandem mass spectrometry method for the determination of tetrandrine and fangchinoline in rat plasma after oral administration of Fangji Huangqi Tang and Stephania tetrandra S. Moore
extracts. J Sep Sci 2015; 38:1286-93. [DOI: 10.1002/jssc.201401384] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Revised: 01/16/2015] [Accepted: 01/19/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Xiaoli Wang
- College of Pharmacy; Nanjing University of Chinese Medicine; Nanjing P. R. China
- Nanjing Haichang Chinese Medicine Group Corporation; Nanjing P. R. China
| | - Xiao Liu
- College of Pharmacy; Nanjing University of Chinese Medicine; Nanjing P. R. China
- College of Science; Cleveland State University; Cleveland, OH USA
| | - Hao Cai
- College of Pharmacy; Nanjing University of Chinese Medicine; Nanjing P. R. China
| | - Ke Pei
- College of Pharmacy; Nanjing University of Chinese Medicine; Nanjing P. R. China
| | - Gang Cao
- College of Pharmacy; Nanjing University of Chinese Medicine; Nanjing P. R. China
- Research Center of TCM processing Technology; Zhejiang Chinese Medical University; Hangzhou P. R. China
| | - Xiaoyan Xu
- Shanghai AB Sciex Analytical Instrument Trading Co., Ltd; Shanghai P. R. China
| | - Fa Shi
- Liaoning Institute for Food and Drug Control; Shengyang P. R. China
| | - Baochang Cai
- College of Pharmacy; Nanjing University of Chinese Medicine; Nanjing P. R. China
- Nanjing Haichang Chinese Medicine Group Corporation; Nanjing P. R. China
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13
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Rapid turbidimetric assay to potency evaluation of tigecycline in lyophilized powder. J Microbiol Methods 2015; 110:49-53. [DOI: 10.1016/j.mimet.2015.01.017] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Revised: 01/22/2015] [Accepted: 01/22/2015] [Indexed: 12/20/2022]
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14
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Musijowski J, Piórkowska E, Rudzki PJ. Determination of sunitinib in human plasma using liquid chromatography coupled with mass spectrometry. J Sep Sci 2014; 37:2652-8. [DOI: 10.1002/jssc.201400231] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 06/20/2014] [Accepted: 07/01/2014] [Indexed: 11/10/2022]
Affiliation(s)
- Jacek Musijowski
- Pharmacology Department, Pharmaceutical Research Institute; Warsaw Poland
| | - Edyta Piórkowska
- Pharmacology Department, Pharmaceutical Research Institute; Warsaw Poland
| | - Piotr J. Rudzki
- Pharmacology Department, Pharmaceutical Research Institute; Warsaw Poland
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