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Formulation development and optimization of taste-masked azithromycin oral suspension with ion exchange resins: Bioanalytical method development and validation, in vivo bioequivalence study, and in-silico PBPK modeling for the paediatric population. J Drug Deliv Sci Technol 2023. [DOI: 10.1016/j.jddst.2022.104048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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2
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Zhang Y, Bala V, Chhonker YS, Aldhafiri W, John LN, Bjerum CM, King CL, Mitja O, Marks M, Murry DJ. A simple, high-throughput and validated LC-MS/MS method for determination of azithromycin in human plasma and its application to a clinical pharmacokinetic study. Biomed Chromatogr 2022; 36:e5443. [PMID: 35789011 PMCID: PMC9539494 DOI: 10.1002/bmc.5443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 06/29/2022] [Accepted: 06/30/2022] [Indexed: 11/06/2022]
Abstract
A sensitive, specific and rapid liquid chromatographic-tandem mass spectrometric (LC-MS/MS) method was developed and validated to quantify azithromycin concentrations in human plasma. Azithromycin (AZI) is the most common outpatient prescribed antibiotic in the US and clinical studies have demonstrated the efficacy and safety of AZI in many bacterial infections. To support a clinical study, we developed a high throughput LC-MS/MS method to process up to 250 samples per day to quantify AZI in human plasma. Samples were prepared by solid phase extraction. Separation was achieved with an ACE C18 column (2.1 x 100 mm, 1.7 μm) equipped with a C18 guard column. The mobile phase consisted of 0.1% formic acid and methanol/acetonitrile (1:1, v/v) at a flow rate of 0.25 mL/min. The ionization was optimized with positive electrospray source using multiple reaction monitoring transition, m/z 749.50>591.45 for AZI and m/z 754.50>596.45 for AZI-d5. Extraction recoveries were approximately 90% for AZI. The assay was linear from 0.5 to 2000 ng/mL and required only 100 μL of plasma with total analysis time of 4.5 minutes. The method was successfully applied to pharmacokinetic studies of a weight-based dosing protocol for AZI.
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Affiliation(s)
- Yuning Zhang
- Clinical Pharmacology Laboratory. Department of Pharmacy Practice and Science, College of Pharmacy, University of Nebraska Medical Center, Omaha, NE, United States.,Department of Pharmacy, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Veenu Bala
- Clinical Pharmacology Laboratory. Department of Pharmacy Practice and Science, College of Pharmacy, University of Nebraska Medical Center, Omaha, NE, United States
| | - Yashpal S Chhonker
- Clinical Pharmacology Laboratory. Department of Pharmacy Practice and Science, College of Pharmacy, University of Nebraska Medical Center, Omaha, NE, United States
| | - Wafaa Aldhafiri
- Clinical Pharmacology Laboratory. Department of Pharmacy Practice and Science, College of Pharmacy, University of Nebraska Medical Center, Omaha, NE, United States.,Department of Pharmaceutical Science, College of Pharmacy, University of Nebraska Medical Center, Omaha, NE, United States
| | - Lucy N John
- National Department of Health, Port Moresby, Papua New Guinea.,University of Barcelona, Barcelona, Spain.,School of Medicine and Health Sciences, University of Papua New Guinea, Port Moresby, Papua New Guinea
| | - Catherine M Bjerum
- Center for Global Health and Diseases, Case Western Reserve University, Cleveland, OH, USA
| | - Christopher L King
- Center for Global Health and Diseases, Case Western Reserve University, Cleveland, OH, USA.,Veterans Affairs Medical Center, Cleveland, OH, USA
| | - Oriol Mitja
- University of Barcelona, Barcelona, Spain.,School of Medicine and Health Sciences, University of Papua New Guinea, Port Moresby, Papua New Guinea
| | - Michael Marks
- London School of Hygiene and Tropical Medicine, London, United Kingdom.,Hospital for Tropical Diseases, London, United Kingdom.,Division of Infection and Immunity, University College London, London, United Kingdom
| | - Daryl J Murry
- Clinical Pharmacology Laboratory. Department of Pharmacy Practice and Science, College of Pharmacy, University of Nebraska Medical Center, Omaha, NE, United States.,Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, United States
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Sherazi STH, Mahesar SA, Sirajuddin, Malah MA. Brief Overview of Frequently used Macrolides and Analytical Techniques for their Assessment. CURR ANAL CHEM 2019. [DOI: 10.2174/1573411014666180917105750] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Background:
Macrolide antibiotics are known as versatile broad-spectrum antibiotics.
Macrolides belong to the oldest group of antibacterial agents. The macrolides which are frequently
used for clinical purposes are broadly categorized in three classes depending on the number of
membered macrocyclic lactone ring. These three classes actually consist of 14, 15 or 16 atoms in macrocyclic
lactone ring which are linked through glycosidic bonds. Erythromycin, azithromycin clarithromycin
and roxithromycin are frequently used to control against bacterial infections.
Methods:
The quality assurance and quality controls are important tasks in the pharmaceutical industries.
Consequently, to check the quality of drugs, there is a strong need to know about alternative
analytical methods for the routine analysis. Many methods have been reported in the literature for the
quantitative determination of erythromycin, clarithromycin, azithromycin and clarithromycin in
pharmaceutical formulations and biological samples.
Results:
This review will cover a brief introduction of erythromycin, azithromycin, clarithromycin and
roxithromycin as well as analytical techniques for their assessment. Each developed method has its
own merits and demerits.
Conclusion:
Any accurate method could be used for the quality control and quality assurance of
macrolide antibiotics according to the availability, performance and procedure of selected instrument
as well as skill and expertise of the analyst.
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Affiliation(s)
| | - Sarfaraz Ahmed Mahesar
- National Centre of Excellence in Analytical Chemistry, University of Sindh, Jamshoro-76080, Pakistan
| | - Sirajuddin
- National Centre of Excellence in Analytical Chemistry, University of Sindh, Jamshoro-76080, Pakistan
| | - Muhammad Ali Malah
- National Centre of Excellence in Analytical Chemistry, University of Sindh, Jamshoro-76080, Pakistan
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Su R, Wang X, Hou C, Yang M, Huang K, Chen H. Fast Determination of Ingredients in Solid Pharmaceuticals by Microwave-Enhanced In-Source Decay of Microwave Plasma Torch Mass Spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2017; 28:1947-1957. [PMID: 28631113 PMCID: PMC5556135 DOI: 10.1007/s13361-017-1708-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Revised: 04/20/2017] [Accepted: 04/24/2017] [Indexed: 06/09/2023]
Abstract
Rapid qualitative and quantitative analysis of solid samples (e.g., pharmaceutical preparations) by using a small and low-resolution mass spectrometer without MS/MS function is still a challenge in ambient pressure ionization mass spectrometric analysis. Herein, a practically efficient method termed microwave-enhanced in-source decay (MEISD) using microwave plasma torch desorption ionization coupled with time-of-flight mass spectrometry (MPTDI-TOF MS) was developed for fast analysis of pharmaceutical tablets using a miniature TOF mass spectrometer without tandem mass function. The intensity of ISD fragmentation was evaluated under different microwave power values. Several factors, including desorption distance and time that might affect the signal intensity and fragmentation, were systematically investigated. It was observed that both the protonated molecular ions and major fragment ions from the active ingredients in tablets could be found in the full-scan mass spectra in positive ion mode, which were comparable to those obtained by a commercial LTQ-XL ion trap mass spectrometer. The structures of the ingredients could be elucidated in detail using the MEISD method, which promotes our understanding of the desorption/ionization processes in microwave plasma torch (MPT). Quantitative analysis of 10 tablets was achieved by full-scan MPTDI-TOF MS with low limit of detection (LOD, 0.763 mg/g), acceptable relative standard deviation (RSD < 7.33%, n =10), and 10 s for each tablet, showing promising applications in high throughput screening of counterfeit drugs. Graphical Abstract ᅟ.
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Affiliation(s)
- Rui Su
- Department of Chemistry, Jilin University, Changchun, 130012, China
- Changchun University of Chinese Medicine, Changchun, 130117, China
| | - Xinchen Wang
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China University of Technology, Nanchang, Jiangxi, 330013, China
| | - Changming Hou
- Department of Chemistry, Jilin University, Changchun, 130012, China
| | - Meiling Yang
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China University of Technology, Nanchang, Jiangxi, 330013, China
| | - Keke Huang
- Department of Chemistry, Jilin University, Changchun, 130012, China
| | - Huanwen Chen
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China University of Technology, Nanchang, Jiangxi, 330013, China.
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5
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Vodstrcil LA, Rupasinghe TWT, Kong FYS, Tull D, Worthington K, Chen MY, Huston WM, Timms P, McConville MJ, Fairley CK, Bradshaw CS, Tabrizi SN, Hocking JS. Measurement of tissue azithromycin levels in self-collected vaginal swabs post treatment using liquid chromatography and tandem mass spectrometry (LC-MS/MS). PLoS One 2017; 12:e0177615. [PMID: 28498845 PMCID: PMC5428968 DOI: 10.1371/journal.pone.0177615] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 04/30/2017] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Azithromycin is recommended for the treatment of uncomplicated urogenital chlamydia infection although the standard 1gram dose sometimes fails to eradicate the infection (treatment failure). One hypothesis proposed for treatment failure has been insufficient levels of the antibiotic at the site of infection. We developed an assay using liquid chromatography and tandem mass spectrometry (LC-MS/MS) to measure azithromycin concentration in high-vaginal swabs and monitor how concentration changes over time following routine azithromycin treatment. METHODS Azithromycin concentrations were measured in two groups of women either within the first 24h of taking a 1g dose (N = 11) or over 9 days (N = 10). Azithromycin concentrations were normalised to an internal standard (leucine enkephalin), and the bulk lipid species phosphatidylcholine [PC(34:1)], using an Agilent 6490 triple quadrupole instrument in positive ionisation mode. The abundances of azithromycin, PC(34:1), and leu-enkephalin were determined by multiple reaction monitoring and absolute levels of azithromycin estimated using standard curves prepared on vaginal specimens. RESULTS Vaginal azithromycin concentrations of women were rapidly obtained after 5h post-treatment (mean concentration = 1031mcg/mg of lipid, range = 173-2693mcg/mg). In women followed for 9 days, peak concentrations were highest after day 2 (mean concentration = 2206mcg/mg, range = 721-5791mcg/mg), and remained high for at least 9 days with a mean concentration of 384mcg/mg (range = 139-1024mcg/mg) on day 9. CONCLUSION Our study confirmed that a single 1g dose of azithromycin is rapidly absorbed and remains in the vagina at relatively high levels for at least a week, suggesting that poor antibiotic absorption is unlikely to be an explanation for treatment failure.
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Affiliation(s)
- Lenka A. Vodstrcil
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, University of Melbourne, Parkville, Australia
- Murdoch Children’s Research Institute, Parkville, Australia
- Central Clinical School, Monash University, Melbourne Sexual Health Centre, Carlton, Australia
| | | | - Fabian Y. S. Kong
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, University of Melbourne, Parkville, Australia
| | - Dedreia Tull
- Metabolomics Australia, Bio21 Institute, University of Melbourne, Parkville, Australia
| | - Karen Worthington
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, University of Melbourne, Parkville, Australia
- Central Clinical School, Monash University, Melbourne Sexual Health Centre, Carlton, Australia
| | - Marcus Y. Chen
- Central Clinical School, Monash University, Melbourne Sexual Health Centre, Carlton, Australia
| | | | - Peter Timms
- University of the Sunshine Coast, Maroochydore, Australia
| | - Malcolm J. McConville
- Metabolomics Australia, Bio21 Institute, University of Melbourne, Parkville, Australia
| | - Christopher K. Fairley
- Central Clinical School, Monash University, Melbourne Sexual Health Centre, Carlton, Australia
| | - Catriona S. Bradshaw
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, University of Melbourne, Parkville, Australia
- Central Clinical School, Monash University, Melbourne Sexual Health Centre, Carlton, Australia
| | - Sepehr N. Tabrizi
- Murdoch Children’s Research Institute, Parkville, Australia
- Department of Microbiology and Infectious Diseases, The Royal Women’s Hospital, Parkville, Victoria, Australia
- Department of Obstetrics and Gynecology, University of Melbourne, The Royal Women’s Hospital Parkville, Victoria, Australia
| | - Jane S. Hocking
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, University of Melbourne, Parkville, Australia
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Kong FYS, Rupasinghe TW, Simpson JA, Vodstrcil LA, Fairley CK, McConville MJ, Hocking JS. Pharmacokinetics of a single 1g dose of azithromycin in rectal tissue in men. PLoS One 2017; 12:e0174372. [PMID: 28350806 PMCID: PMC5370104 DOI: 10.1371/journal.pone.0174372] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 03/08/2017] [Indexed: 11/18/2022] Open
Abstract
Chlamydia is the most common bacterial sexually transmitted infection among men who have sex with men. Repeat infection following treatment with 1g azithromycin is common and treatment failure of up to 22% has been reported. This study measured the pharmacokinetics of azithromycin in rectal tissue in men following a single 1g dose to assess whether azithromycin reaches the rectal site in adequate concentrations to kill chlamydia. Ten healthy men took a single oral dose of 1g azithromycin and provided nine self-collected swabs and one blood sample over 14 days. Participant demographics, medications, sexual behaviour, treatment side effects, lubricant use and douching practices were recorded with each swab. Drug concentration over time was determined using liquid chromatography-mass spectrometry and total exposure (AUC0-∞) was estimated from the concentration-time profiles. Following 1g of azithromycin, rectal concentrations peaked after a median of 24 hours (median 133mcg/g) and remained above the minimum inhibitory concentration for chlamydia (0.125mcg/mL) for at least 14 days in all men. AUC0-∞ was the highest ever reported in human tissue (13103((mcg/g).hr)). Tissue concentrations were not associated with weight (mg/kg), but data suggest that increased gastric pH could increase azithromycin levels and diarrhoea or use of water-based lubricants could decrease concentrations. High and sustained concentrations of azithromycin were found in rectal tissue following a single 1g dose suggesting that inadequate concentrations are unlikely to cause treatment failure. Factors effecting absorption (pH and diarrhoea) or drug depletion (douching and water-based lubricants) may be more important determinants of concentrations in situ.
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Affiliation(s)
- Fabian Y. S. Kong
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, University of Melbourne, Melbourne, Australia
- * E-mail:
| | - Thusitha W. Rupasinghe
- Metabolomics Australia, School of BioSciences, University of Melbourne, Melbourne, Australia
| | - Julie A. Simpson
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, University of Melbourne, Melbourne, Australia
| | - Lenka A. Vodstrcil
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, University of Melbourne, Melbourne, Australia
- Monash University Central Clinical School and Melbourne Sexual Health Centre, Melbourne, Australia
| | - Christopher K. Fairley
- Monash University Central Clinical School and Melbourne Sexual Health Centre, Melbourne, Australia
| | - Malcolm J. McConville
- Metabolomics Australia, Bio21 Institute for Molecular Science and Biotechnology, University of Melbourne, Melbourne, Australia
| | - Jane S. Hocking
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, University of Melbourne, Melbourne, Australia
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7
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Azithromycin-molecularly imprinted polymer based on PVC membrane for Azithromycin determination in drugs using coated graphite electrode. J Electroanal Chem (Lausanne) 2015. [DOI: 10.1016/j.jelechem.2015.05.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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8
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Filist M, Buś-Kwaśnik K, Ksycińska H, Rudzki PJ. Simplified LC–MS/MS method enabling the determination of azithromycin in human plasma after a low 100 mg dose administration. J Pharm Biomed Anal 2014; 100:184-189. [DOI: 10.1016/j.jpba.2014.07.015] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Revised: 07/19/2014] [Accepted: 07/20/2014] [Indexed: 10/24/2022]
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9
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An optimal LC-MS/MS method for determination of azithromycin in white blood cells: application to pediatric samples. Bioanalysis 2014; 6:2317-28. [DOI: 10.4155/bio.14.81] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Background: Studies suggest that particular antimicrobial and anti-inflammatory properties of azithromycin (AZM) can be related to its extensive accumulation in white blood cells (WBCs). However, available methods for determination of AZM in WBCs require large blood volumes unsuited to a pediatric context. Therefore, an LC-MS/MS method was developed for determination of AZM in WBCs. Results: WBCs were isolated from 500 µl of whole blood by lysing red blood cells. Then, lysis of WBCs was performed with methanol/buffer containing AZM-d3-13C as internal standard. After reversed phase LC, detection was performed under multiple reaction monitoring conditions in positive electrospray mode. Linearity ranged from 0.5 to 200 ng per WBC sample. Within-run and overall accuracy and precision ranged from 95.3 to 101.1% and from 1.6 to 4.7%, respectively. All validation parameters fulfilled international requirements. Conclusions: This method can be easily performed on small samples and provides reliable data, including in children and neonates.
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Structural elucidation studies of 15-membered azalide macrocycles using H/D exchange and ESI-MSn. J Pharm Biomed Anal 2013; 86:1-10. [DOI: 10.1016/j.jpba.2013.07.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Revised: 06/29/2013] [Accepted: 07/07/2013] [Indexed: 11/21/2022]
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Hocking JS, Vodstrcil LA, Huston WM, Timms P, Chen MY, Worthington K, McIver R, Tabrizi SN. A cohort study of Chlamydia trachomatis treatment failure in women: a study protocol. BMC Infect Dis 2013; 13:379. [PMID: 23957327 PMCID: PMC3751832 DOI: 10.1186/1471-2334-13-379] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Accepted: 08/14/2013] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Chlamydia trachomatis is the most commonly diagnosed bacterial sexually transmitted infection in the developed world and diagnosis rates have increased dramatically over the last decade. Repeat infections of chlamydia are very common and may represent re-infection from an untreated partner or treatment failure. The aim of this cohort study is to estimate the proportion of women infected with chlamydia who experience treatment failure after treatment with 1 gram azithromycin. METHODS/DESIGN This cohort study will follow women diagnosed with chlamydia for up to 56 days post treatment. Women will provide weekly genital specimens for further assay. The primary outcome is the proportion of women who are classified as having treatment failure 28, 42 or 56 days after recruitment. Comprehensive sexual behavior data collection and the detection of Y chromosome DNA and high discriminatory chlamydial genotyping will be used to differentiate between chlamydia re-infection and treatment failure. Azithromycin levels in high-vaginal specimens will be measured using a validated liquid chromatography-tandem mass spectrometry method to assess whether poor azithromycin absorption could be a cause of treatment failure. Chlamydia culture and minimal inhibitory concentrations will be performed to further characterize the chlamydia infections. DISCUSSION Distinguishing between treatment failure and re-infection is important in order to refine treatment recommendations and focus infection control mechanisms. If a large proportion of repeat chlamydia infections are due to antibiotic treatment failure, then international recommendations on chlamydia treatment may need to be re-evaluated. If most are re-infections, then strategies to expedite partner treatment are necessary.
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Affiliation(s)
- Jane S Hocking
- Melbourne School of Population and Global Health, University of Melbourne, Level 3, 207 Bouverie St, Carlton 3053, Victoria, Australia
| | - Lenka A Vodstrcil
- Melbourne School of Population and Global Health, University of Melbourne, Level 3, 207 Bouverie St, Carlton 3053, Victoria, Australia
- Murdoch Children’s Research Institute, Parkville 3052, Victoria, Austrlaia
| | - Wilhelmina M Huston
- Institute of Health and Biomedical Innovation, Queensland University of Technology, 60 Musk Ave, Kelvin Grove, Brisbane 4057, Queensland, Australia
| | - Peter Timms
- Institute of Health and Biomedical Innovation, Queensland University of Technology, 60 Musk Ave, Kelvin Grove, Brisbane 4057, Queensland, Australia
| | - Marcus Y Chen
- Melbourne School of Population and Global Health, University of Melbourne, Level 3, 207 Bouverie St, Carlton 3053, Victoria, Australia
- Melbourne Sexual Health Centre, 580 Swanston Street, Carlton 3053, Victoria, Australia
| | - Karen Worthington
- Melbourne Sexual Health Centre, 580 Swanston Street, Carlton 3053, Victoria, Australia
| | - Ruthy McIver
- Sydney Sexual Health Centre, Sydney Hospital, Macquarie Street, Sydney 2001, New South Wales, Australia
| | - Sepehr N Tabrizi
- Murdoch Children’s Research Institute, Parkville 3052, Victoria, Austrlaia
- Department of Microbiology and Infectious Diseases, the Royal Women’s Hospital, Parkville 3052, Victorian, Australia
- Department of Obstetrics and Gynaecology, University of Melbourne, Carlton 3053, Victoria, Australia
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Sharma K, Mullangi R. A concise review of HPLC, LC-MS and LC-MS/MS methods for determination of azithromycin in various biological matrices. Biomed Chromatogr 2013; 27:1243-58. [DOI: 10.1002/bmc.2898] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2013] [Accepted: 02/03/2013] [Indexed: 11/11/2022]
Affiliation(s)
- Kuldeep Sharma
- Drug Metabolism and Pharmacokinetics; Jubilant Biosys Ltd, Industrial Suburb; Yeshwanthpur; Bangalore; 560 022; India
| | - Ramesh Mullangi
- Drug Metabolism and Pharmacokinetics; Jubilant Biosys Ltd, Industrial Suburb; Yeshwanthpur; Bangalore; 560 022; India
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Pan L, Guo Y, Li Z, Chen J, Jiang T, Yu Y. Simultaneous Determination of Levodopa, Benserazide and 3-O-Methyldopa in Human Serum by LC–MS–MS. Chromatographia 2010. [DOI: 10.1365/s10337-010-1683-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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14
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Pan L, Yu Y, Sun L. AN LC–MS Method for a Hexokinase Inhibitor Study Based on Adenosine 5′-Triphosphate Determination and Application to the Anticancer Mechanism of Momordica cochinchinensis. Chromatographia 2010. [DOI: 10.1365/s10337-010-1672-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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15
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Hu X, Luo Y, Zhou Q. Simultaneous Analysis of Selected Typical Antibiotics in Manure by Microwave-Assisted Extraction and LC–MS n. Chromatographia 2010. [DOI: 10.1365/s10337-009-1438-8] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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