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Liquid Chromatography tandem mass spectrometry

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https://www.readbyqxmd.com/read/28822347/screening-and-confirmation-of-steroids-and-nitroimidazoles-in-urine-blood-and-food-matrices-sample-preparation-methods-and-liquid-chromatography-tandem-mass-spectrometric-separations
#1
Ádám Tölgyesi, Enikő Barta, Andrea Simon, Thomas J McDonald, Virender K Sharma
Veterinary drugs containing synthetic anabolic steroid and nitroimidazole active agents are not allowed for their applications in livestock of the European Union (EU). This paper presents analyses of twelve selected steroids and six nitroimidazole antibiotics at low levels (1.56μg/L-4.95μg/L and 0.17μg/kg-2.14μg/kg, respectively) in body fluids and egg incurred samples. Analyses involved clean-up procedures, high performance liquid chromatography (HPLC) separation, and tandem mass spectrometric screening and confirmatory methods...
August 5, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28822224/is-it-necessary-for-all-samples-to-quantify-25ohd2-and-25ohd3-using-lc-ms-ms-in-clinical-practice
#2
Songlin Yu, Ruiping Zhang, Weiyan Zhou, Xinqi Cheng, Qian Cheng, Liangyu Xia, Shaowei Xie, Yicong Yin, Dandan Sun, Wei Su, Ling Qiu
BACKGROUND: The demand for vitamin D testing is increasing in China. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) immunoassay is specific and accurate but requires expensive equipment, experienced operators, and complicated pretreatment of serum. Automated immunoassays are simple and convenient but only determine total 25-hydroxyvitamin D (25OHD). The objective of this study was to quantify 25OHD2 and 25OHD3 in patients to assist clinical physicians and laboratory directors in choosing the most appropriate method to determine 25OHD...
August 19, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28822158/-fast-identification-of-constituents-of-lagotis-brevituba-by-using-uplc-q-tof-ms-ms-method
#3
Jing Xie, Li Zhang, Jin-Xiang Zeng, Min Li, Juan Wang, Xiong-Xiong Xie, Guo-Yue Zhong, Guang-Ming Luo, Jin-Bin Yuan, Jian Liang
The chemical constituents of Lagotis brevituba were rapidly determined and analyzed by using ultra performance liquid chromatography tandem quadrupole time of flight mass spectrometry (UPLC-Q-TOF-MS/MS) method, providing material basis for the clinical application of L. brevituba. The separation was performed on UPLC YMC-Triart C₁₈ (2.1 mm×100 mm, 1.9 μm) column, with acetonitrile-water containing 0.2% formic acid as mobile phase for gradient elution. The flow rate was 0.4 mL•min-1 gradient elution and column temperature was 40 ℃, the injection volume was 2 μL...
June 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28822126/dimethyl-labeling-based-quantification-of-the-lysine-acetylome-and-proteome-of-plants
#4
Ines Lassowskat, Markus Hartl, Fabian Hosp, Paul J Boersema, Matthias Mann, Iris Finkemeier
Photorespiratory enzymes in different cellular compartments have been reported to be posttranslational modified by phosphorylation, disulfide formation, S-nitrosylation, glutathionylation, and lysine acetylation. However, not much is known yet about the function of these modifications to regulate the activities, localizations, or interactions of the proteins in this metabolic pathway. Hence, it will be of great importance to study these modifications and their temporal and conditional occurrence in more detail...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28821634/lipidomic-and-proteomic-analysis-of-exosomes-from-mouse-cortical-collecting-duct-cells
#5
Viet D Dang, Kishore Kumar Jella, Ragy R T Ragheb, Nancy D Denslow, Abdel A Alli
Exosomes are endosome-derived nanovesicles that are involved in cellular communication and signaling. Exosomes are produced by epithelial cells and are found in biologic fluids including blood and urine. The packaged material within exosomes includes proteins and lipids, but the molecular comparison within exosome subtypes is largely unknown. The purpose of this study was to investigate differences between exosomes derived from the apical plasma membrane and basolateral plasma membrane of polarized murine cortical collecting duct principal cells...
August 16, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28821000/simultaneous-liquid-chromatography-tandem-mass-spectrometry-analysis-of-brominated-flame-retardants-tetrabromobisphenol-a-and-hexabromocyclododecane-diastereoisomers-in-french-breast-milk
#6
Chanthadary Inthavong, Frédéric Hommet, François Bordet, Virginie Rigourd, Thierry Guérin, Sylviane Dragacci
TBBPA and HBCDs are the two classes of flame retardants that are still allowed for use by the European Commission. In May 2013, HBCDs were listed as Persistent Organic Pollutants under the Stockholm Convention, and they were banned with an exemption on EPS/XPS for cavity wall insulation. This study describes the development and optimisation of a rapid LC-ESI-MS/MS method using isotopic dilution quantification including a simplified extraction step using a mixture of solvents and sulphuric acid hydrolysis followed by the one-shot analysis of TBBPA and each of the α-, β- and γ-HBCD diastereoisomers...
August 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28820983/a-sensitive-method-for-the-separation-and-quantification-of-low-level-adenine-nucleotides-using-porous-graphitic-carbon-based-liquid-chromatography-and-tandem-mass-spectrometry
#7
Sonia Bustamante, Robert B Gilchrist, Dulama Richani
A liquid chromatography coupled to heated electrospray ionization/tandem mass spectrometry (LC-HESI-MS/MS) method was developed for the simultaneous quantitative analysis of low nanomolar level adenine nucleotides AMP, ADP, ATP, cyclic AMP (cAMP), and the nucleoside adenosine. For analyte retention and separation, reverse phase chromatography using porous graphitic carbon (PGC) was employed as it provided full resolution. The erratic chromatographic behaviour characteristic of PGC, including deterioration of analyte resolution and increased peak tailing (leading to decreased sensitivity), was mitigated by incorporating acidic equilibration within runs using a quaternary gradient...
July 29, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28820460/determination-of-sphingosine-1-phosphate-in-human-plasma-using-liquid-chromatography-coupled-with-q-tof-mass-spectrometry
#8
Emmanuel Eroume-A Egom, Ross Fitzgerald, Rebecca Canning, Rebabonye B Pharithi, Colin Murphy, Vincent Maher
Evidence suggests that high-density lipoprotein (HDL) components distinct from cholesterol, such as sphingosine-1-phosphate (S1P), may account for the anti-atherothrombotic effects attributed to this lipoprotein. The current method for the determination of plasma levels of S1P as well as levels associated with HDL particles is still cumbersome an assay method to be worldwide practical. Recently, a simplified protocol based on liquid chromatography-tandem mass spectrometry (LC-MS/MS) for the sensitive and specific quantification of plasma levels of S1P with good accuracy has been reported...
August 18, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28820428/pharmacokinetic-analysis-of-an-oral-multicomponent-joint-dietary-supplement-phycox-%C3%A2-in-dogs
#9
Stephanie E Martinez, Ryan Lillico, Ted M Lakowski, Steven A Martinez, Neal M Davies
Despite the lack of safety, efficacy and pharmacokinetic (PK) studies, multicomponent dietary supplements (nutraceuticals) have become increasingly popular as primary or adjunct therapies for clinical osteoarthritis in veterinary medicine. Phycox(®) is a line of multicomponent joint support supplements marketed for joint health in dogs and horses. Many of the active constituents are recognized anti-inflammatory and antioxidant agents. Due to a lack of PK studies in the literature for the product, a pilot PK study of select constituents in Phycox(®) was performed in healthy dogs...
August 18, 2017: Pharmaceutics
https://www.readbyqxmd.com/read/28820044/determination-of-fusarium-toxins-in-functional-vegetable-milks-applying-salting-out-assisted-liquid-liquid-extraction-combined-with-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry
#10
Ahmed M Hamed, Natalia Arroyo-Manzanares, Ana M García-Campaña, Laura Gámiz-Gracia
Vegetable milks are considered as functional foods due to their physiological benefits. Although the consumption of these products has significantly increased, they have received little attention in legislation, as regard to contaminants. However, they may contain mycotoxins resulting from the use of contaminated raw materials. In this work, ultra-high performance liquid chromatography tandem mass spectrometry has been proposed for the determination of the most relevant Fusarium toxins (fumonisin B1 and B2, HT-2 and T-2 toxins, zearalenone, deoxynivalenol and fusarenon-X) in different functional beverages based on cereals, legumes and seeds...
August 18, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28819918/network-analysis-of-se-and-zn-related-proteins-in-the-serum-proteomics-expression-profile-of-the-endemic-dilated-cardiomyopathy-keshan-disease
#11
Sen Wang, Yanyan Lv, Yingting Wang, Peiru Du, Wuhong Tan, Mikko J Lammi, Xiong Guo
Keshan disease (KD) is an endemic cardiomyopathy with high mortality. Selenium (Se) and zinc (Zn) deficiencies are closely related to KD. The molecular mechanism of KD pathogenesis is still unclear. There are only few studies on the interaction of trace elements and proteins associated with the pathogenesis of KD. In this study, isobaric tags for relative and absolute quantitation (iTRAQ)-coupled two-dimensional liquid chromatography tandem mass spectrometry (2DLC-MS/MS) technique analysis was used to analyze the differential expression of proteins from serum samples...
August 18, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28818804/an-on-spot-internal-standard-addition-approach-for-accurately-determining-colistin-a-and-colistin-b-in-dried-blood-spots-using-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry
#12
I-Lin Tsai, Ching-Hua Kuo, Hsin-Yun Sun, Yu-Chung Chuang, Divyabharathi Chepyala, Shu-Wen Lin, Yun-Jung Tsai
Outbreaks of multidrug-resistant Gram-negative bacterial infections have been reported worldwide. Colistin, an antibiotic with known nephrotoxicity and neurotoxicity, is now being used to treat multidrug-resistant Gram-negative strains. In this study, we applied an on-spot internal standard addition approach coupled with an ultra high-performance liquid chromatography-tandem mass spectrometry (LC-MS/MS) method to quantify colistin A and B from dried blood spots (DBSs). Only 15μL of whole blood was required for each sample...
August 3, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28818801/development-and-validation-of-a-reliable-method-for-thiopurine-methyltransferase-tpmt-enzyme-activity-in-human-whole-blood-by-lc-ms-ms-an-application-for-phenotypic-and-genotypic-correlations
#13
Supaporn Wiwattanakul, Santirhat Prommas, Nuttawut Jenjirattithigarn, Siwalee Santon, Apichaya Puangpetch, Samart Pakakasama, Usanarat Anurathapan, Chonlaphat Sukasem
A liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed for the determination of thiopurine methyltransferase (TPMT) activity in human whole blood lysate, based on conversion of 6-mercaptopurine (6-MP) by TPMT to 6-methylmercaptopurine (6-MMP) using S-adenosyl-l-methionine (SAM) as the methyl donor. This method was improved from the previous laborious method for washing of red cell lysate preparation to develop whole blood EDTA lysate. In addition, the TPMT incubation was optimized and the chromatography was performed in a short runtime of 7min on a C18-column by detection via triple quadrupole mass spectrometry...
August 4, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28817836/sitting-physical-activity-and-serum-oestrogen-metabolism-in-postmenopausal-women-the-women-s-health-initiative-observational-study
#14
Hannah Oh, Hannah Arem, Charles E Matthews, Nicolas Wentzensen, Kerryn W Reding, Louise A Brinton, Garnet L Anderson, Sally B Coburn, Jane A Cauley, Chu Chen, Deborah Goodman, Ruth M Pfeiffer, Roni T Falk, Xia Xu, Britton Trabert
BACKGROUND: Prolonged sitting and lower levels of physical activity have been associated with increased levels of parent oestrogens (oestrone and oestradiol), the key hormones in female cancers, in postmenopausal women. However, it is unknown whether sitting and physical activity are associated with circulating oestrogen metabolite levels. METHODS: Among 1804 postmenopausal women enrolled in the Women's Health Initiative Observational Study, 15 serum oestrogens/oestrogen metabolites were quantified using liquid chromatography-tandem mass spectrometry...
August 17, 2017: British Journal of Cancer
https://www.readbyqxmd.com/read/28815938/optimization-of-recombinant-%C3%AE-glucuronidase-hydrolysis-and-quantification-of-eight-urinary-cannabinoids-and-metabolites-by-liquid-chromatography-tandem-mass-spectrometry
#15
Cristina Sempio, Karl B Scheidweiler, Allan J Barnes, Marilyn A Huestis
Prolonged urinary cannabinoid excretion in chronic frequent cannabis users confounds identification of recent cannabis intake that may be important in treatment, workplace, clinical, and forensic testing programs. In addition, differentiation of synthetic Δ9-tetrahydrocannabinol (THC) intake from cannabis plant products might be an important interpretive issue. THC, 11-hydroxy-THC (11-OH-THC) and 11-nor-9-carboxy-THC (THCCOOH) urine concentrations were evaluated during previous controlled cannabis administration studies following tandem alkaline/E...
June 14, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/28815810/proteome-characterization-of-human-pancreatic-cyst-fluid-from-intraductal-papillary-mucinous-neoplasm-by-lc-ms-ms
#16
Joonho Park, Dohyun Han, Misol Do, Jongmin Woo, Joseph I Wang, Youngmin Han, Wooil Kwon, Sun-Whe Kim, Jin-Young Jang, Youngsoo Kim
RATIONALE: In recent years, the molecular components of pancreatic cyst fluid has been used for diagnosis and prognosis. Because the protein markers that are currently used in clinical tests are unreliable, proteomic studies to find new protein markers are being conducted. However, such researches have been limited due to the complexity of pancreatic cyst fluid and the immaturity of proteomic techniques. METHODS: To overcome these limitations and provide a pancreatic cyst proteome dataset, we examined cyst fluid proteome with tandem mass spectrometry...
August 15, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28815689/medication-adherence-in-patients-with-apparent-resistant-hypertension-findings-from-the-sympathy-trial
#17
R L de Jager, E M van Maarseveen, M L Bots, P J Blankestijn
INTRODUCTION: Hypertension is only controlled in approximately 35% of the patients, which could be partially due to non-adherence. Recently, bioanalytical assessment of adherence to blood pressure (BP) lowering drugs has gaining interest. Our aim was to explore possible determinants of non-adherence in treatment resistant hypertension, assessed by objective screening for antihypertensive agents in serum. Secondary aim was to study the effect of adherence on the change in BP. METHODS: This project was a sub-study of SYMPATHY; an open-label randomized-controlled trial to assess the effect of renal denervation on BP six months after treatment compared to usual care in patients with resistant hypertension...
August 17, 2017: British Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/28815484/diagnostic-performance-of-a-newly-developed-salivary-cortisol-and-cortisone-measurement-using-an-lc-ms-ms-method-with-simple-and-rapid-sample-preparation
#18
K Mészáros, G Karvaly, Z Márta, B Magda, J Tőke, N Szücs, M Tóth, K Rácz, A Patócs
BACKGROUND: Late-night salivary cortisol level is one of the first-line tests recommended by the Endocrine Society for the diagnosis of endogenous hypercortisolism. Most routine laboratories measure cortisol levels using immunoassay tests which fail to determine low cortisol levels accurately due to the numerous interfering substances. A liquid chromatography-tandem mass spectrometry (LC-MS/MS) method with simple and rapid sample preparation was developed for the simultaneous measurement of cortisol and cortisone and its performance in the diagnosis of endogenous hypercortisolism was evaluated...
August 16, 2017: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/28815276/determination-of-89-drugs-and-other-micropollutants-in-unfiltered-wastewater-and-freshwater-by-lc-ms-ms-an-alternative-sample-preparation-approach
#19
Alexandros G Asimakopoulos, Pranav Kannan, Sean Higgins, Kurunthachalam Kannan
A liquid chromatography-triple quadrupole-tandem mass spectrometry (LC-qQq-MS/MS) method was developed for simultaneous determination of 89 legal neuropsychiatric pharmaceuticals and illicit drugs (both parent compounds and metabolites) and other micropollutants in unfiltered wastewater and freshwater. The target chemicals fall under the classes of amphetamine-type stimulants, cocaine compounds, opiates and opioids, benzodiazepines, lysergic compounds, antipsychotics, anesthetics, antiepileptics, antidepressants, sympathomimetics, cannabinoids, blood thinners, antihistamines, β-blockers, caffeine derivatives, nicotine derivatives, z-drugs, new designer drugs, and Alzheimer medications...
August 16, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28814945/glomerular-abundance-of-complement-proteins-characterized-by-proteomic-analysis-of-laser-captured-microdissected-glomeruli-associates-with-progressive-disease-in-iga-nephropathy
#20
Teodora Ioana Flavia Paunas, Kenneth Finne, Sabine Leh, Hans-Peter Marti, Tom Eirik Mollnes, Frode Berven, Bjørn Egil Vikse
BACKGROUND: The clinical course of IgA nephropathy (IgAN) is variable and complement activation may predict prognosis. The present study investigated whether glomerular abundance of complement proteins associates with progression to end-stage renal disease (ESRD) in patients for whom prognosis could not be predicted based on clinical variables. METHODS: Based on data from the Norwegian Kidney Biopsy Registry and the Norwegian Renal Registry, three groups were included: IgAN patients with (n = 9) or without (n = 16) progression to ESRD during 10 years, and controls (n = 15) with a normal kidney biopsy...
2017: Clinical Proteomics
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