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https://www.readbyqxmd.com/read/28821077/building-a-fructan-lc-ms-2-library-and-its-application-to-reveal-the-fine-structure-of-cereal-grain-fructans
#1
Joran Verspreet, Anders Holmgaard Hansen, Scott J Harrison, Rudy Vergauwen, Wim Van den Ende, Christophe M Courtin
A liquid chromatography-mass spectrometry (LC-MS) library is presented containing the relative retention times of 28 fructan oligomers and MS(2) spectra of 18 of them. It includes the main representatives of all fructan classes occurring in nature and with a degree of polymerization between three and five. This library enables a rapid and unambiguous detection of these 18 fructan structures in any type of sample without the need for fructan purification or the synthesis of fructan standards. Its wide applicability is demonstrated by the analysis of fructans in a set of cereal flour samples...
October 15, 2017: Carbohydrate Polymers
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
#2
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/28820982/direct-analysis-no-sample-preparation-of-bioavailable-cortisol-in-human-plasma-by-weak-affinity-chromatography-wac
#3
Sten Ohlson, Jagjit Kaur, Manfred Raida, Ulf Niss, Tim Bengala, Chester Lee Drum, Bernhard Boehm, Anthony R Torres
Pre-analytical treatment of blood plasma is a time consuming and often rate limiting step in the workflow of LC/MS analysis. We present in this pilot study a new approach for quantitative LC/MS based on weak affinity chromatography (WAC) of crude plasma. The steroid hormone cortisol was selected as a clinically relevant biomarker, as it currently requires extensive pre-analytical preparation. A WAC unit with saturating, immobilized albumin as a prototypic weak binder was used in combination with an ion-funnel MS/MS detector to perform zonal affinity chromatography of cortisol directly from a plasma sample, followed by quantitative multiple reaction monitoring (MRM)...
July 21, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28820481/studies-on-the-presence-of-mycotoxins-in-biological-samples-an-overview
#4
REVIEW
Laura Escrivá, Guillermina Font, Lara Manyes, Houda Berrada
Mycotoxins are fungal secondary metabolites with bioaccumulation levels leading to their carry-over into animal fluids, organs, and tissues. As a consequence, mycotoxin determination in biological samples from humans and animals has been reported worldwide. Since most mycotoxins show toxic effects at low concentrations and considering the extremely low levels present in biological samples, the application of reliable detection methods is required. This review summarizes the information regarding the studies involving mycotoxin determination in biological samples over the last 10 years...
August 18, 2017: Toxins
https://www.readbyqxmd.com/read/28820460/determination-of-sphingosine-1-phosphate-in-human-plasma-using-liquid-chromatography-coupled-with-q-tof-mass-spectrometry
#5
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/28820206/a-cross-platform-metabolomics-workflow-for-volume-restricted-tissue-samples-application-to-an-animal-model-for-polycystic-kidney-disease
#6
E Sánchez-López, H Happé, E Steenvoorden, A L Crego, M L Marina, D J M Peters, O A Mayboroda
Metabolic profiling provides an unbiased view of the physiological status of an organism as a "function" of the metabolic composition of a measured sample. Here, we propose a simple LC-MS based workflow for metabolic profiling of volume-restricted samples, namely individual 20 μm-thick histological sections of a mouse kidney. The main idea of this workflow is to re-use the material after an RPLC-MS run, namely using the volume remaining in the vial after injection, and then introducing a phase changing step to enable HILIC-MS analysis...
August 18, 2017: Molecular BioSystems
https://www.readbyqxmd.com/read/28819550/effects-of-storage-temperature-on-airway-exosome-integrity-for-diagnostic-and-functional-analyses
#7
Rosario Maroto, Yingxin Zhao, Mohammad Jamaluddin, Vsevolod L Popov, Hongwang Wang, Madumali Kalubowilage, Yueqing Zhang, Jonathan Luisi, Hong Sun, Christopher T Culbertson, Stefan H Bossmann, Massoud Motamedi, Allan R Brasier
Background: Extracellular vesicles contain biological molecules specified by cell-type of origin and modified by microenvironmental changes. To conduct reproducible studies on exosome content and function, storage conditions need to have minimal impact on airway exosome integrity. Aim: We compared surface properties and protein content of airway exosomes that had been freshly isolated vs. those that had been treated with cold storage or freezing. Methods: Mouse bronchoalveolar lavage fluid (BALF) exosomes purified by differential ultracentrifugation were analysed immediately or stored at +4°C or -80°C...
2017: Journal of Extracellular Vesicles
https://www.readbyqxmd.com/read/28819353/a-metabolomics-guided-exploration-of-marine-natural-product-chemical-space
#8
Dimitrios J Floros, Paul R Jensen, Pieter C Dorrestein, Nobuhiro Koyama
INTRODUCTION: Natural products from culture collections have enormous impact in advancing discovery programs for metabolites of biotechnological importance. These discovery efforts rely on the metabolomic characterization of strain collections. OBJECTIVE: Many emerging approaches compare metabolomic profiles of such collections, but few enable the analysis and prioritization of thousands of samples from diverse organisms while delivering chemistry specific read outs...
September 2016: Metabolomics: Official Journal of the Metabolomic Society
https://www.readbyqxmd.com/read/28819266/amalaki-rasayana-a-traditional-indian-drug-enhances-cardiac-mitochondrial-and-contractile-functions-and-improves-cardiac-function-in-rats-with-hypertrophy
#9
Vikas Kumar, Kumar A Aneesh, K Kshemada, Kumar G S Ajith, Raj S S Binil, Neha Deora, G Sanjay, A Jaleel, T S Muraleedharan, E M Anandan, R S Mony, M S Valiathan, Kumar T R Santhosh, C C Kartha
We evaluated the cardioprotective effect of Amalaki Rasayana (AR), a rejuvenating Ayurvedic drug prepared from Phyllanthus emblica fruits in the reversal of remodeling changes in pressure overload left ventricular cardiac hypertrophy (LVH) and age-associated cardiac dysfunction in male Wistar rats. Six groups (aging groups) of 3 months old animals were given either AR or ghee and honey (GH) orally; seventh group was untreated. Ascending aorta was constricted using titanium clips in 3 months old rats (N = 24; AC groups) and after 6 months, AR or GH was given for further 12 months to two groups; one group was untreated...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819071/genetic-and-non-genetic-factors-associated-with-protein-abundance-of-flavin-containing-monooxygenase-3-in-human-liver
#10
Meijuan Xu, Deepak Kumar Bhatt, Catherine K Yeung, Katrina G Claw, Amarjit S Chaudhry, Andrea Gaedigk, Robin E Pearce, Ulrich Broeckel, Roger Gaedigk, Debbie Nickerson, Erin Schuetz, Allan E Rettie, Steven Leeder, Kenneth E Thummel, Bhagwat Prasad
Hepatic flavin-containing monooxygenase 3 (FMO3) metabolizes a broad array of nucleophilic heteroatom (e.g., N or S)-containing xenobiotics (e.g., amphetamine, sulindac, benzydamine, ranitidine, tamoxifen, nicotine, and ethioniamide), as well as endogenous compounds (e.g., catecholamine and trimethylamine). To predict the effect of genetic and non-genetic factors on the hepatic metabolism of FMO3 substrates, we quantified FMO3 protein abundance in human liver microsomes (HLM; n=445) by LC-MS/MS proteomics. Genotyping/gene-resequencing, mRNA expression, and functional activity (with benzydamine as a probe substrate) of FMO3 were also performed...
August 17, 2017: Journal of Pharmacology and Experimental Therapeutics
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
#11
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
#12
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/28818726/identification-of-functional-interactome-of-a-key-cell-division-regulatory-protein-ceda-of-e-coli
#13
Pankaj Sharma, Anil Kumar Tomar, Bishwajit Kundu
Cell division is compromised in DnaAcos mutant Escherichia coli cells that results in filamentous cell morphology. This is countered by over-expression of CedA protein that induces cytokinesis and thus, regular cell morphology is regained; however via an unknown mechanism. To understand the process systematically, exact role of CedA should be deciphered. Protein interactions are crucial for functional organization of a cell and their identification helps in revealing exact function(s) of a protein and its binding partners...
August 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28817223/single-dose-euglycemic-clamp-studies-demonstrating-pharmacokinetic-and-pharmacodynamic-similarity-between-mk-1293-insulin-glargine-and-originator-insulin-glargine-lantus-in-type-1-diabetes-and-healthy-subjects
#14
Michael Crutchlow, John S Palcza, Kate M Mostoller, Chantal D Mahon, April M Barbour, Michael C Marcos, Yang Xu, Elaine Watkins, Linda Morrow, Marcus Hompesch
AIMS: MK-1293 is an insulin glargine that has an identical amino acid sequence to that of Lantus, the originator insulin glargine. Two euglycemic clamp studies, one in subjects with Type 1 diabetes (T1D) and one in healthy subjects, were conducted to demonstrate pharmacokinetic (PK) and pharmacodynamic (PD) similarity between MK-1293 and Lantus commercially procured in both the European Union (EU-Lantus) and United States (US-Lantus). MATERIALS AND METHODS: Both studies were single-dose, randomized, double-blind, single-center, crossover studies with ≥7 days between dosing periods...
August 17, 2017: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/28816644/cyp2b6-haplotype-predicts-efavirenz-plasma-concentration-in-black-south-african-hiv-1-infected-children-a-longitudinal-pediatric-pharmacogenomic-study
#15
Riaan Reay, Collet Dandara, Michelle Viljoen, Malie Rheeders
South Africa has the highest burden of the human immunodeficiency virus (HIV) infection globally. Efavirenz (EFV), a frequently used drug against HIV infection, displays a relationship between drug concentration and pharmacodynamics effects clinically. However, haplotype-based genetic variation in drug metabolism in a pediatric sample has been little considered in a longitudinal long-term context. CYP2B6 plays a key role in variation of EFV plasma concentration through altered drug metabolism. We report here on a prospective clinical pharmacogenomics/pharmacokinetic study of Bantu-speaking children, importantly, over a period of 24 months post-initiation of EFV-based treatment in South Africa...
August 2017: Omics: a Journal of Integrative Biology
https://www.readbyqxmd.com/read/28816067/post-acquisition-data-mining-techniques-for-lc-ms-ms-acquired-data-in-drug-metabolite-identification
#16
Pooja Sukhdev Dhurjad, Vamsi Krishna Marothu, Rajeshwari Rathod
Metabolite identification is a crucial part of the drug discovery process. LC-MS/MS-based metabolite identification has gained widespread use, but the data acquired by the LC-MS/MS instrument is complex, and thus the interpretation of data becomes troublesome. Fortunately, advancements in data mining techniques have simplified the process of data interpretation with improved mass accuracy and provide a potentially selective, sensitive, accurate and comprehensive way for metabolite identification. In this review, we have discussed the targeted (extracted ion chromatogram, mass defect filter, product ion filter, neutral loss filter and isotope pattern filter) and untargeted (control sample comparison, background subtraction and metabolomic approaches) post-acquisition data mining techniques, which facilitate the drug metabolite identification...
August 17, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28815942/plasma-membrane-protein-profiling-in-beta-amyloid-treated-microglia-cell-line
#17
Virginia Correani, Laura Di Francesco, Giuseppina Mignogna, Cinzia Fabrizi, Stefano Leone, Alessandra Giorgi, Alessia Passeri, Roberto Casata, Lorenzo Fumagalli, Bruno Maras, M Eugenia Schininà
In the responsiveness of microglia to toxic stimuli, plasma membrane proteins play a key role. In this study we treated with a synthetic beta amyloid peptide murine microglial cells metabolically differently labelled with stable isotope amino acids (SILAC). The plasma membrane was selectively enriched by a multi-stage aqueous two-phase partition system. We were able to identify by 1D-LC-MS/MS analyses 1577 proteins, most of them are plasma membrane proteins according to the Gene Ontology annotation. An unchanged level of amyloid receptors in this data set, suggests that microglia preserve their responsiveness capability to the environment even after 24 h-challenge with amyloid peptides...
August 16, 2017: Proteomics
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
#18
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
#19
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/28815728/effects-of-bifenthrin-exposure-on-the-estrogenic-and-dopaminergic-pathways-in-zebrafish-embryos-and-juveniles
#20
Luísa Becker Bertotto, Jaben Richards, Jay Gan, David Christopher Volz, Daniel Schlenk
Bifenthrin (BF) is a pyrethroid insecticide used in urban and agricultural applications. Previous studies have shown that environmentally relevant (ng/L) concentrations of BF increased plasma concentrations of 17β-estradiol (E2) and altered the expression of dopaminergic (DA) pathway components. DA neurons can indirectly regulate E2 biosynthesis, suggesting that BF may disrupt the hypothalamic-pituitary-gonadal (HPG) axis. Since embryos do not have a complete HPG axis, the hypothesis that BF impairs DA regulation was tested in embryonic and one-month old juvenile zebrafish (Danio rerio) with exposure to measured concentrations of 0...
August 16, 2017: Environmental Toxicology and Chemistry
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