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https://www.readbyqxmd.com/read/29148595/determination-of-cefoperazone-and-sulbactam-in-serum-by-hplc-ms-ms-an-adapted-method-for-therapeutic-drug-monitoring-in-children
#1
Xiu-Jun Wu, Xin Huang, Hai-Yan Shi, Xing-Kai Chen, Qian Dong, Guo-Xiang Hao, Yan Li, Yi Zheng, Wei Zhao
A rapid, accurate and specific high-performance liquid chromatographic -tandem mass spectrometry method has been validated for the simultaneous determination of cefoperazone and sulbactam in a small volume sample for children. A Shim-pack XR-ODS C18 column with gradient elution of water (0.1% formic acid) and acetonitrile (0.1% formic acid) solution was used for separation at a flow rate of 0.3 mL/min. The calibration curves of two analytes in serum showed excellent linearity over the concentration ranges of 0...
November 17, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29142545/rapid-screening-of-pyogenic-staphylococcus-aureus-for-confirmation-of-genus-and-species-methicillin-resistance-and-virulence-factors-by-using-two-novel-multiplex-pcr
#2
Abdul Haque, Asma Haque, Muhammad Saeed, Aysha Azhar, Samreen Rasool, Sidra Shan, Beenish Ehsan, Zohaib Nisar
Objectives: Emergence of methicillin resistant Staphylococcus aureus (MRSA) is a major medical problem of current era. These bacteria are resistant to most drugs and rapid diagnosis can provide a clear guideline to clinicians. They possess specific virulence factors and relevant information can be very useful. We designed this study to develop multiplex PCRs to provide rapid information. Methods: We studied 60 Staphylococcus aureus isolates and detected methicillin resistance by cefoxitin sensitivity and targeting of mecA gene...
September 2017: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/29140880/high-risk-human-papillomavirus-determination-in-formalin-fixed-paraffin-embedded-cervical-tissue-using-the-roche-cobas-4800-system-a-comparative-study-with-liquid-based-cytology
#3
Juan C Tardío, Olivia Cambero, Carolina Sánchez-Estévez, Ana B Sánchez-García, Fernando Angulo, Amalia Moreno
Roche cobas 4800 human papillomavirus (HPV) test is an automated real-time polymerase chain reaction-based system that allows the simultaneous detection of 14 human papillomavirus high-risk (HR-HPV) genotypes. This test is Food and Drug Administration approved since 2011 for HPV determination in liquid-based cytologic samples, but a clinically validated technique for formalin-fixed, paraffin-embedded (FFPE) tissue specimens is presently not commercially available. In our laboratory, we have developed an HPV detection procedure in FFPE tissue by cobas 4800 HPV test...
November 14, 2017: International Journal of Gynecological Pathology
https://www.readbyqxmd.com/read/29140288/capillary-electrophoresis-hyphenated-with-mass-spectrometry-for-determination-of-inflammatory-bowel-disease-drugs-in-clinical-urine-samples
#4
Katarína Maráková, Juraj Piešťanský, Zuzana Zelinková, Peter Mikuš
Azathioprine is the main thiopurine drug used in the treatment of immune-based inflammations of gastrointestinal tract. For the purpose of therapy control and optimization, effective and reliable analytical methods for a rapid drug monitoring in biological fluids are essential. Here, we developed a separation method based on the capillary electrophoresis (CE) hyphenated with tandem mass spectrometry (MS/MS) for the simultaneous determination of azathioprine and its selected metabolites (6-thioguanine, 6-mercaptopurine, and 6-methylmercaptopurine) as well as other co-medicated drugs (mesalazine, prednisone, and allopurinol)...
November 15, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29138284/rapid-diagnosis-of-pulmonary-tuberculosis-and-detection-of-drug-resistance-by-combined-simultaneous-amplification-testing-and-reverse-dot-blot
#5
Yiwen Chen, Lahong Zhang, Liquan Hong, Xian Luo, Juping Chen, Leiming Tang, Jiahuan Chen, Xia Liu, Zhaojun Chen
AIMS: Making a correct and rapid diagnosis is essential for managing pulmonary tuberculosis (PTB), particularly multidrug-resistant tuberculosis. We aimed to evaluate the efficacy of the combination of simultaneous amplification testing (SAT) and reverse dot blot (RDB) for the rapid detection of Mycobacterium tuberculosis (MTB) and drug-resistant mutants in respiratory samples. METHODS: 225 suspected PTB and 32 non-TB pulmonary disease samples were collected. All sputum samples were sent for acid-fast bacilli smear, SAT, culture and drug susceptibility testing (DST) by the BACTEC(TM) MGIT(TM) 960 system...
November 14, 2017: Journal of Clinical Pathology
https://www.readbyqxmd.com/read/29136743/-drug-resistance-mutations-and-its-associated-factors-among-579-hiv-aids-patients-experiencing-failure-of-antiretroviral-therapy-in-jiangsu-province-china
#6
P P Xiao, J Lu, H Y Hu, X Q Xu, P Ding, G F Fu, X P Huan, Y Zhou, H T Yang
Objective: To understand the incidence and related factors of HIV-1 drug resistance among HIV/AIDS patients experiencing treatment failure in Jiangsu province, China. Methods: The HIV/AIDS integrated prevention and control data information management system of China were used to collect the basic data of patients, blood specimens were collected from patients who had antiretroviral therapy (ART) failure with ≥12 months and older than 18 years in 2016 in Jiangsu, excluding cases with missing information, 713 cases were enrolled in this study...
November 6, 2017: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
https://www.readbyqxmd.com/read/29132777/a-comparison-between-biostimulation-and-bioaugmentation-in-a-solid-treatment-of-anaerobic-sludge-drug-content-and-microbial-evaluation
#7
G Llorens-Blanch, E Parladé, M Martinez-Alonso, N Gaju, G Caminal, P Blánquez
Emerging pollutants can reach the environment through the sludge of Wastewater Treatment Plants. In this work, the use of Trametes versicolor in biopiles at lab-scale was studied, evaluating its capacity to remove the most hydrophobic Pharmaceuticals and assessing the evolution of the biopiles microbial communities. The total removal of drugs at real concentrations from sewage sludge was assessed for non-inoculated and fungal inoculated biopiles, testing if the re-inoculation of the biopiles after 22 days of treatment would improve the removal yields...
November 10, 2017: Waste Management
https://www.readbyqxmd.com/read/29131996/development-and-application-of-the-diffusive-gradients-in-thin-films-technique-for-simultaneous-measurement-of-methcathinone-and-ephedrine-in-surface-river-water
#8
Yan Zhang, Tingting Zhang, Changsheng Guo, Song Hou, Zhendong Hua, Jiapei Lv, Yuan Zhang, Jian Xu
In this study, a passive sampling technique, diffusive gradients in thin films (DGT) was developed to simultaneously measure two drugs, methcathinone (MC) and ephedrine (EPH) in surface water. Four types of binding gels and four types of filter membranes were tested for the optimal configuration. XAD18 agarose binding gel and agarose diffusive gel, together with polyethersulfone filter membrane were used for measuring MC and EPH in the DGT device. 5% NH3 in acetonitrile was used as the elution solvent, with the elution efficiency for MC and EPH higher than 71%...
November 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29129858/green-electroanalytical-method-for-fast-measurement-of-xanthine-oxidase-inhibitor-febuxostat
#9
Biljana Nigovic, Ivona Milanovic
The electrooxidation of xanthine oxidase inhibitor febuxostat was investigated on a boron-doped diamond electrode in aqueous solution. The oxidation of the drug molecule was irreversible and exhibited a diffusion-controlled form. A green electroanalytical method for simple and fast measurements of febuxostat was developed at the unmodified electrode surface. The analyses were performed using square-wave voltammetric peak current at 1.38 V. The linear response was obtained in the range of 7.5 × 10(-7) - 2.0 × 10(-5) M with the detection limit of 9...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29112986/simultaneous-genome-wide-gene-expression-and-transcript-isoform-profiling-in-the-human-malaria-parasite
#10
Lindsey B Turnbull, Geoffrey H Siwo, Katrina A Button-Simons, Asako Tan, Lisa A Checkley, Heather J Painter, Manuel Llinás, Michael T Ferdig
Gene expression DNA microarrays have been vital for characterizing whole-genome transcriptional profiles. Nevertheless, their effectiveness relies heavily on the accuracy of genome sequences, the annotation of gene structures, and the sequence-dependent performance of individual probes. Currently available gene expression arrays for the malaria parasite Plasmodium falciparum rely on an average of 2 probes per gene, usually positioned near the 3' end of genes; consequently, existing designs are prone to measurement bias and cannot capture complexities such as the occurrence of transcript isoforms arising from alternative splicing or alternative start/ stop sites...
2017: PloS One
https://www.readbyqxmd.com/read/29112902/development-of-a-stability-indicating-hplc-method-for-simultaneous-determination-of-ten-related-substances-in-vonoprazan-fumarate-drug-substance
#11
Zhiqiang Luo, Aoxue Liu, Yang Liu, Guopeng Wang, Xinjing Chen, Hao Wang, Mengwei Li, Haili Zhang, Yanhua Qiu, Huaqiang Zhai
Vonoprazan fumarate is a novel potassium-competitive acid blocker for the treatment of acid-related diseases. In the present study, a simple, fast, and economic reversed-phase liquid chromatography (LC) method was developed for the analysis of ten related substances (raw materials, by-products and degradants) in vonoprazan fumarate. The optimized separation was performed on a Phenomenex Kinetex EVO C18 (250mm×4.6mm, 5.0μm) column. The mobile phase consisted of (A) 0.03M sodium phosphate buffer (pH adjusted to 6...
November 4, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29111580/drug-residues-in-used-syringes-in-switzerland-a-comparative-study
#12
Elodie Lefrançois, Marc Augsburger, Pierre Esseiva
Harm reduction services, including needle exchange programs, have been implemented in Switzerland for over twenty years. Their main aim is to lessen the negative social and/or physical consequences associated with illicit drug consumption and, therefore, improve prevention messages. To this end, knowledge about illicit drug consumption practices is necessary. Periodic self-report surveys are the primary source of data for monitoring drug users' behaviour. Analysis of residual content of used syringes can bring further and objective knowledge about consumed products through analytically confirmed data...
November 7, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/29109766/cancer-nanomedicines-stabilized-by-%C3%AF-%C3%AF-stacking-between-heterodimeric-prodrugs-enable-exceptionally-high-drug-loading-capacity-and-safer-delivery-of-drug-combinations
#13
Hangxiang Wang, Jianmei Chen, Chang Xu, Linlin Shi, Munire Tayier, Jiahui Zhou, Jun Zhang, Jiaping Wu, Zhijian Ye, Tao Fang, Weidong Han
Combination therapy using distinct mode-of-action drugs has sparked a rapidly growing interest because this paradigm holds promise for improving the therapeutic efficacy of anticancer therapy. However, the current drug combination therapy refers to administering individual drugs together, which is far from a perfect regimen for cancer patients. The aim of this work was to demonstrate that synergistic delivery of two chemotherapeutic drugs in a single nanoparticle reservoir could be achieved through the rational chemical ligation of the drugs followed by supramolecular nano-assembly via blending of the drugs with a minimal amount of matrix...
2017: Theranostics
https://www.readbyqxmd.com/read/29100029/validation-of-an-lc-ms-ms-assay-to-simultaneously-monitor-the-intracellular-active-metabolites-of-tenofovir-emtricitabine-and-lamivudine-in-dried-blood-spots
#14
Amanda P Schauer, Craig Sykes, Mackenzie L Cottrell, Heather Prince, Angela D M Kashuba
The ability to monitor adherence to antiretroviral therapy is critical for the interpretation of outcomes from clinical studies of HIV, and for optimizing patient care. The antiretrovirals tenofovir (TFV), emtricitabine (FTC), and lamivudine (3TC) are commonly included in drug regimens for HIV prevention and treatment. The active form of the drugs tenofovir diphosphate (TFVdp), emtricitabine triphosphate (FTCtp), and lamivudine triphosphate (3TCtp) are found intracellularly in erythrocytes and peripheral blood mononuclear cells (PBMCs)...
October 31, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29094589/enthalpy-based-screening-of-focused-combinatorial-libraries-for-the-identification-of-potent-and-selective-ligands
#15
Carlo Baggio, Parima Udompholkul, Elisa Barile, Maurizio Pellecchia
In modern drug discovery, the ability of biophysical methods, including nuclear magnetic resonance spectroscopy or surface plasmon resonance, to detect and characterize ligand-protein interactions accurately and unambiguously makes these approaches preferred versus conventional biochemical high-throughput screening of large collections of compounds. Nonetheless, ligand screening strategies that address simultaneously potency and selectivity have not yet been fully developed. In this work, we propose a novel method for screening large collections of combinatorial libraries using enthalpy measurements as a primary screening technique...
November 2, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/29078252/analysis-of-new-psychoactive-substances-in-oral-fluids-by-means-of-microextraction-by-packed-sorbent-followed-by-uhplc-ms-ms
#16
Rachele Rocchi, Maria Chiara Simeoni, Camilla Montesano, Gabriele Vannutelli, Roberta Curini, Manuel Sergi, Dario Compagnone
In recent years, new drugs, commonly known as "new psychoactive substances" (NPS), appeared on the market, which include, among others, synthetic cannabinoids, cathinones and tryptamine analogs of psilocin. The aim of this work was to develop and validate a new method for simultaneous screening and quantification of 31 NPS in oral fluid by ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS). The chosen target analytes represented different chemical and toxicological NPS classes, such as synthetic cathinones, piperazines, phenethylamines, synthetic cannabinoids and their metabolites...
October 27, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/29075176/retinal-and-cortical-blood-flow-dynamics-following-systemic-blood-neural-barrier-disruption
#17
Flora Hui, Christine T O Nguyen, Zheng He, Algis J Vingrys, Rachel Gurrell, Rebecca L Fish, Bang V Bui
To consider whether imaging retinal vasculature may be used as a marker for cortical vessels, we compared fluorescein angiography flow dynamics before and after pharmacological disruption of blood-neural barriers. Sodium fluorescein (1%, 200 μl/kg) was intravenously delivered in anesthetized adult Long Evans rats (n = 44, brain = 18, retina = 26). In the brain cohort, a cranial window was created to allow direct visualization of surface cortical vessels. Video fluorescein angiography was captured using a rodent retinal camera at 30 frames/second and fluorescence intensity profiles were evaluated for the time to reach 50% brightness (half-rise), 50% decay (half-fall), and the plateau level of remnant fluorescence (offset, %)...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29071785/simultaneous-determination-of-amlodipine-and-metoprolol-in-their-combined-dosage-form-using-a-synchronous-fluorescence-spectrofluorimetric-method
#18
Mokhtar M Mabrouk, Sherin F Hammad, Samah F El-Malla, Eman A Elshenawy
Highly sensitive, rapid, accurate and precise synchronous fluorescence spectrofluorimetric method has been developed for simultaneous analysis of a mixture of amlodipine (AMD) and metoprolol (MET). The method relies on measuring the relative synchronous fluorescence intensity of both drugs at Δλ of 90 nm in acetate buffer solution at pH 5. The experimental parameters influencing the developed method were investigated and optimized. The method was linear over the ranges 0.2-2 μg/ml and 0.5-10 μg/ml for AMD and MET, respectively...
October 25, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29071784/simultaneous-determination-of-niacin-and-pyridoxine-at-trace-levels-by-using-diode-array-high-performance-liquid-chromatography-and-liquid-chromatography-with-quadrupole-time-of-flight-tandem-mass-spectrometry
#19
Sabriye Sel, Elif Öztürk Er, Sezgin Bakırdere
A highly sensitive and simple diode-array high-performance liquid chromatography and liquid chromatography with quadrupole time-of-flight tandem mass spectrometry method was developed for the simultaneous determination of niacin and pyridoxine in pharmaceutical drugs, tap water and wastewater samples. To determine the in vivo behavior of niacin and pyridoxine, analytes were subjected to simulated gastric conditions. The calibration plots of the diode-array high-performance liquid chromatography and liquid chromatography with quadrupole time-of-flight tandem mass spectrometry method showed good linearity over a wide concentration range with close to 1...
October 26, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/29065836/stability-indicating-liquid-chromatographic-method-for-simultaneous-determination-of-aspirin-and-omeprazole
#20
Vandana B Patel, Aishwarya D Patel, Dimal A Shah
BACKGROUND: Aspirin combination is prescribed for the its thrombolytic activity where gastric ulceration is the major side effects of aspirin which can be prevented by combining it with proton pump inhibitor omeprazole. Present study describes development of analytical method for the estimation of aspirin and omeprazole in combination. Objective of the present study was to develop and validate chromatographic method for simultaneous analysis of aspirin and omeprazole. METHODS: Isocratic, reversed phase stability indicating liquid chromatographic method was developed for the simultaneous determination of Aspirin and Omeprazole in combination...
October 23, 2017: Current Drug Discovery Technologies
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