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Liquid Chromatography tandem mass spectrometry

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https://www.readbyqxmd.com/read/29775810/a-validated-uplc-ms-ms-method-for-the-quantitation-of-an-unstable-peptide-monocyte-locomotion-inhibitory-factor-mlif-in-human-plasma-and-its-application-to-a-pharmacokinetic-study
#1
Xuemei Liu, Pei Hu, Yongsheng Wang, Xizhu Wang, Jinghua Huang, Jin Li, Cheng Li, Hongyun Wang, Ji Jiang
Monocyte locomotion inhibitory factor (MLIF, Met-Gln-Cys-Asn-Ser), a pentapeptide with anti-inflammatory activity, was developed for neural protection in acute ischemic stroke. Determination of MLIF in human plasma samples is of great importance for pharmacokinetic evaluation in clinical studies. A reliable and sensitive method based on ultra-performance liquid chromatography coupled with tandem mass spectrometry (UPLC-MS/MS) was established for the measurement of MLIF in human plasma. Instability of peptide in matrix was the primary challenge in method development, which was properly resolved by addition of acidification reagents like sulfuric acid...
April 10, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29775619/proteomic-approach-to-profiling-immune-complex-antigens-in-cerebrospinal-fluid-samples-from-patients-with-central-nervous-system-autoimmune-diseases
#2
Nozomi Aibara, Kunihiro Ichinose, Miyako Baba, Hideki Nakajima, Katsuya Satoh, Ryuichiro Atarashi, Naoya Kishikawa, Noriyuki Nishida, Atsushi Kawakami, Naotaka Kuroda, Kaname Ohyama
BACKGROUND: Immune complexes (ICs) may clearly reflect immunological abnormalities caused by disease, especially for autoimmune diseases. Although ICs have been detected in cerebrospinal fluid (CSF) from patients with CNS autoimmune diseases, identities of antigens in such ICs have not been comprehensively determined. METHODS: We used immune complexome analysis, in which nano-liquid chromatography-tandem mass spectrometry is employed to comprehensively identify antigens incorporated into ICs in biological fluids, to characterize ICs in CSF samples from patients with CNS autoimmune diseases, and to find disease-specific IC antigen to a certain CNS autoimmune disease...
May 15, 2018: Clinica Chimica Acta; International Journal of Clinical Chemistry
https://www.readbyqxmd.com/read/29775427/determination-of-fipronil-and-its-metabolites-in-chicken-egg-muscle-and-cake-by-a-modified-quechers-method-coupled-with-lc-ms-ms
#3
Qiaozhen Guo, Shan Zhao, Jing Zhang, Kailun Qi, Zhenxia Du, Bing Shao
An easy-to-use method for determining the levels of fipronil and its metabolites (fipronil-desulfinyl, fipronil-sulfone and fipronil-sulfide) in chicken egg, muscle and cake was developed and validated using a modified quick, easy, cheap, effective, rugged, and safe (QuEChERS) approach coupled with liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis. The samples were extracted using acetonitrile, salted out with sodium chloride at -20 °C, and then purified by combined PSA and C18 phases and anhydrous magnesium sulfate...
May 18, 2018: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/29775289/mass-spectral-detection-of-diethoxyphospho-tyrosine-adducts-on-proteins-from-hek293-cells-using-monoclonal-antibody-depy-for-enrichment
#4
Seda Onder, Lawrence M Schopfer, Ozden Tacal, Thomas A Blake, Rudolph C Johnson, Oksana Lockridge
Chronic illness from exposure to organophosphorus toxicants is hypothesized to involve modification of unknown proteins. Tyrosine in proteins that have no active site serine readily reacts with organophosphorus toxicants. We developed a monoclonal antibody, depY, that specifically recognizes diethoxyphospho-tyrosine in proteins and peptides, independent of the surrounding amino acid sequence. Our goal in the current study was to identify diethoxyphosphorylated proteins in human HEK293 cell lysate treated with chlorpyrifos oxon...
May 18, 2018: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/29773339/quantitation-of-isoprenoids-for-natural-rubber-biosynthesis-in-natural-rubber-latex-by-liquid-chromatography-with-tandem-mass-spectrometry
#5
Xi Zhang, Tianyang Guo, Tong Xiang, Yiyang Dong, Jichuan Zhang, Liqun Zhang
The natural rubber molecule is one of the end products of isoprenoids metabolism in the plant. Dimethylallyl diphosphate (DMAPP) and farnesyl pyrophosphate (FPP) are two typical isoprenoids which control the rate of biosynthesis and the molecular weight of natural rubber. A rapid, nonradioactive method for quantitation of DMAPP and FPP in natural rubber latex by liquid chromatography tandem with mass spectrometry (LC-MS/MS) was reported. DMAPP and FPP were determined in the multiple reaction monitoring mode(MRM)followed by separation with a silica-based C18 column...
May 3, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29772515/simultaneous-determination-of-nine-neonicotinoids-in-human-urine-using-isotope-dilution-ultra-performance-liquid-chromatography-tandem-mass-spectrometry
#6
Quan Zhang, Ximing Wang, Zhe Li, Hangbiao Jin, Zhengbiao Lu, Chang Yu, Yu-Fang Huang, Meirong Zhao
Neonicotinoids (neonics), a class of systemic insecticides, have been frequently detected in pollen, vegetables, and fruits. Recently, an increasing concern has been aroused for human exposure to neonics. However, biological monitoring for quantifying body burden of neonics has rarely been reported. In this study, we developed an isotope-dilution ultra-high performance liquid chromatography coupled with tandem mass spectrometry (UPLC-MS/MS) method to simultaneously quantify nine neonics, including acetamiprid (ACE), thiamethoxam (THIAM), imidacloprid (IMIP), clothianidin (CLO), flonicamid (FLO), thiacloprid (THIAC), dinotefuran (DIN), nitenpyram (NIT), and imidaclothiz (IMIT) in urine...
May 14, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29772457/in-vitro-and-in-vivo-metabolic-investigation-of-the-palbociclib-by-uhplc-q-tof-ms-ms-and-in-silico-toxicity-studies-of-its-metabolites
#7
Balasaheb B Chavan, Shristy Tiwari, Shankar G, Rakesh D Nimbalkar, Prabha Garg, Srinivas R, M V N Kumar Talluri
Palbociclib (PAB) is a CDK4/6 inhibitor and U. S Food and Drug Administration (FDA) granted regular approval for the treatment of hormone receptor (HR) positive, metastatic breast cancer in combination with an aromatase inhibitor in postmenopausal women. Metabolite identification is a crucial aspect during drug discovery and development as the drug metabolites may be pharmacologically active or possess toxicological activity. As there are no reports on the metabolism studies of the PAB, the present study focused on investigation of the in vitro and in vivo metabolic fate of the drug...
May 14, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29770655/-quantitative-determination-of-biogenic-amine-from-biomphalaria-glabrata-nervous-system-by-uplc-ms-ms
#8
Huang Tao, Guo Yun-Hai, Liu He-Xiang, Zhang Yi
OBJECTIVE: To establish a method for the quantitative determination of serotonin and dopamine in the nervous system of Biomphalaria glabrata by using ultra high performance liquid chromatography-tandem quadrupole mass spectrometry (UPLC MS/MS) . METHODS: The B. glabrata nervous system was broken in the pure methanol solution after obtaining it by dissecting with microscope. Then, the supernatant containing the target substance after twice high speed centrifugation was got...
April 19, 2018: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29769081/n-6-methyl-adenosine-level-in-nicotiana-tabacum-is-associated-with-tobacco-mosaic-virus
#9
Zhurui Li, Jing Shi, Lu Yu, Xiaozhen Zhao, Longlu Ran, Deyu Hu, Baoan Song
BACKGROUND: N 6 -methyl-adenosine (m6 A) is a prevalent RNA modification in many species. Abnormal m6 A methylation levels can lead to RNA dysfunction and can cause diseases. Tobacco mosaic virus (TMV) is one of the most devastating viruses for agricultural plants. It has many hosts, particularly including tobacco and other members the family Solanaceae. However, it remains unclear whether the abnormal growth induced by TMV is associated with the m6 A level. METHODS: A rapid and accurate analytical method using ultra-high-performance liquid chromatography coupled with high-resolution tandem mass spectrometry (UHPLC-HR - MS/MS) was developed to analyse the adenosine (A), cytidine (C), guanosine (G), uridine (U), and m6 A contents in the tobacco leaf, and the m6 A/G ratio was used to evaluate the m6 A level...
May 16, 2018: Virology Journal
https://www.readbyqxmd.com/read/29768657/simultaneous-quantification-of-fentanyl-sufentanil-cefazolin-doxapram-and-keto-doxapram-in-plasma-using-liquid-chromatography-tandem-mass-spectrometry
#10
Robert B Flint, Soma Bahmany, Bart C H van der Nagel, Birgit C P Koch
A simple and specific UPLC-MS/MS method was developed and validated for simultaneous quantification of fentanyl, sufentanil, cefazolin, doxapram and its active metabolite keto-doxapram. The internal standard was fentanyl-d5 for all analytes. Chromatographic separation was achieved with a reversed phase Acquity UPLC HSS T3 column with a run-time of only 5.0 minutes per injected sample. Gradient elution was performed with a mobile phase consisting of ammonium acetate, formic acid in Milli-Q ultrapure water or in methanol with a total flow rate of 0...
May 16, 2018: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29767301/capillary-electrophoresis-tandem-mass-spectrometry-for-multiclass-analysis-of-polar-marine-toxins
#11
Daniel G Beach, Elliott S Kerrin, Krista Thomas, Michael A Quilliam, Pearse McCarron
Polar marine toxins are more challenging to analyze by mass spectrometry-based methods than lipophilic marine toxins, which are now routinely measured in shellfish by multiclass reversed-phase liquid chromatography-tandem mass spectrometry (MS/MS) methods. Capillary electrophoresis (CE)-MS/MS is a technique that is well suited for the analysis of polar marine toxins, and has the potential of providing very high resolution separation. Here, we present a CE-MS/MS method developed, with use of a custom-built interface, for the sensitive multiclass analysis of paralytic shellfish toxins, tetrodotoxins, and domoic acid in seafood...
May 16, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29766610/sensitive-and-simultaneous-quantitation-of-6%C3%AE-hydroxycortisol-and-cortisol-in-human-plasma-by-lc-ms-ms-coupled-with-stable-isotope-dilution-method
#12
Ryohei Hirano, Akitomo Yokokawa, Takashi Furuta, Hiromi Shibasaki
CYP3A phenotyping provide a means for personalized drug therapy. We focused our attention on the plasma 6β-hydroxycortisol (6β-OHF) to cortisol ratio as an index for CYP3A phenotyping. In the present study, we developed a sensitive and reliable method for the simultaneous determination of 6β-OHF and cortisol in human plasma using high-performance liquid chromatography/tandem mass spectrometry (LC-MS/MS) together with picolinylester derivatization or nonderivatization methods and 6β-[9,11,12,12-2 H4 ]hydroxycortisol and [1,2,4,19-13 C4 ]cortisol as internal standards for in vivo CYP3A phenotyping in humans...
May 15, 2018: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/29766324/a-general-lc-ms-ms-method-for-monitoring-potential-%C3%AE-lactam-contamination-in-drugs-and-drug-manufacturing-surfaces
#13
Chen Qiu, Hongbin Zhu, Connie Ruzicka, David Keire, Hongping Ye
Penicillins and some non-penicillin β-lactams may cause potentially life-threatening allergic reactions. Thus, possible cross contamination of β-lactams in food or drugs can put people at risk. Therefore, when there is a reasonable possibility that a non-penicillin product could be contaminated by penicillin, the drug products are tested for penicillin contamination. Here, a sensitive and rapid method for simultaneous determination of multiple β-lactam antibiotics using high performance liquid chromatography-tandem mass spectrometry (LC-MS/MS) was developed and validated...
May 15, 2018: AAPS Journal
https://www.readbyqxmd.com/read/29766296/characterization-of-in-vivo-metabolites-in-rat-urine-following-an-oral-dose-of-masitinib-by-liquid-chromatography-tandem-mass-spectrometry
#14
Adnan A Kadi, Sawsan M Amer, Hany W Darwish, Mohamed W Attwa
Masitinib (MST) is an orally administered drug that targets mast cells and macrophages, important cells for immunity, by inhibiting a limited number of tyrosine kinases. It is currently registered in Europe and USA for the treatment of mast cell tumors in dogs. AB Science announced that the European Medicines Agency has accepted a conditional marketing authorization application for MST to treat amyotrophic lateral sclerosis. In our work, we focused on studying in vivo metabolism of MST in Sprague-Dawley rats...
May 15, 2018: Chemistry Central Journal
https://www.readbyqxmd.com/read/29763921/peptidomic-analysis-of-endometrial-tissue-from-patients-with-ovarian-endometriosis
#15
Yunping Xue, Pengfei Xu, Sujuan Xu, Kai Xue, Lingling Xu, Jie Chen, Juan Xu, Xiaoyan Shi, Qian Li, Lin Gu
BACKGROUND/AIMS: Ovarian endometriosis (OvE) is ovarian cyst that is lined with endometrial tissue. They are found in 17-44% of women with endometriosis. Their clinical manifestations include pelvic pain, dysmenorrhea, dyspareunia, and infertility. Although the incidence of OvE has increased yearly, the exact pathogenesis of OvE is still unclear. We used peptidomics, an emerging branch of proteomics, to identify differentially expressed peptides in order to determine the possible roles of these peptides in the pathogenesis of OvE...
May 9, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29763574/how-low-can-you-go-analytical-performance-of-five-automated-testosterone-immunoassays
#16
Sonia L La'ulu, Kimberly J Kalp, Joely A Straseski
BACKGROUND: Testosterone is commonly measured using immunoassays, yet concerns with the accuracy and quality of testing by these methods exist, particularly for low testosterone concentrations. Study objectives were to evaluate selective performance characteristics, including functional sensitivity (FS), of 5 automated immunoassays for total testosterone. METHODS: FS, imprecision, assay interference, limit of blank, linearity, and accuracy were assessed using the Abbott ARCHITECT i2000SR , SIEMENS ADVIA Centaur and IMMULITE 2000, Beckman Coulter DxI 800, and Roche MODULAR E170...
May 12, 2018: Clinical Biochemistry
https://www.readbyqxmd.com/read/29762685/urine-multi-drug-screening-with-gc-ms-or-lc-ms-ms-using-salle-hybrid-ppt-spe
#17
Junhui Lee, Jiwon Park, Ahra Go, Heesung Moon, Sujin Kim, Sohee Jung, Wonjoon Jeong, Heesun Chung
To intoxicated patients in the emergency room, toxicological analysis can be considerably helpful for identifying the involved toxicants. In order to develop a urine multi-drug screening (UmDS) method, gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-tandem mass spectrometry (LC-MS-MS) were used to determine targeted and unknown toxicants in urine. A GC-MS method in scan mode was validated for selectivity, limit of detection (LOD) and recovery. An LC-MS-MS multiple reaction monitoring (MRM) method was validated for lower LOD, recovery and matrix effect...
May 14, 2018: Journal of Analytical Toxicology
https://www.readbyqxmd.com/read/29762654/testing-of-disposable-protective-garments-against-isocyanate-permeation-from-spray-polyurethane-foam-insulation
#18
Michael P Mellette, Dhimiter Bello, Yalong Xue, Michael Yost, Anila Bello, Susan Woskie
Background: Diisocyanates (isocyanates), including methylene diphenyl diisocyanate (MDI), are the primary reactive components of spray polyurethane foam (SPF) insulation. They are potent immune sensitizers and a leading cause of occupational asthma. Skin exposure to isocyanates may lead to both irritant and allergic contact dermatitis and possibly contribute to systemic sensitization. More than sufficient evidence exists to justify the use of protective garments to minimize skin contact with aerosolized and raw isocyanate containing materials during SPF applications...
May 12, 2018: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/29761697/identification-of-proteins-using-itraq-and-vigs-reveals-three-bread-wheat-proteins-involved-in-the-response-to-combined-osmotic-cold-stress
#19
Ning Zhang, Lingran Zhang, Chaonan Shi, Lei Zhao, Dangqun Cui, Feng Chen
Crops are often subjected to a combination of stresses in the field. To date, studies on the physiological and molecular responses of common wheat to a combination of osmotic and cold stresses, however, remain unknown. In this study, wheat seedlings exposed to osmotic-cold stress for 24 h showed inhibited growth, as well as increased lipid peroxidation, relative electrolyte leakage, and soluble sugar contents. iTRAQ-based quantitative proteomics and liquid chromatography-tandem mass spectrometry (LC-MS/MS) methods were employed to determine the proteomic profiles of the roots and leaves of wheat seedlings exposed to osmotic-cold stress conditions...
May 15, 2018: Journal of Proteome Research
https://www.readbyqxmd.com/read/29761641/uhplc-ms-ms-method-for-determining-dinotefuran-and-its-main-metabolites-in-samples-of-plants-animal-derived-foods-soil-and-water
#20
Ying Zhang, Xiaohu Wu, Tingting Duan, Jun Xu, Fengshou Dong, Xingang Liu, Xiaogang Li, Pengqiang Du, Yongquan Zheng
An ultra high performance liquid chromatography with tandem triple quadrupole mass spectrometry residue method for the quantification and identification of dinotefuran and its main metabolites 1-methyl-3-(tetrahydro-3-furylmethyl) urea and 1-methyl-3-(tetrahydro-3-furylmethyl) guanidine in fruit (watermelon), vegetable (cucumber), cereal (rice), animal-derived foods (milk, egg, and pork), soil and water was developed and validated. The samples were extracted with acetonitrile containing 15% v/v acetic acid and purified with dispersive solid-phase extraction with octadecylsilane, primary secondary amine, graphitized carbon black, or zirconia-coated silica prior to analysis...
May 15, 2018: Journal of Separation Science
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