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https://www.readbyqxmd.com/read/28214451/a-novel-lc-ms-ms-method-for-the-simultaneous-quantification-of-topiramate-and-its-main-metabolites-in-human-plasma
#1
Daniela Milosheska, Robert Roškar
The aim of the present report was to develop and validate simple, sensitive and reliable LC-MS/MS method for quantification of topiramate (TPM) and its main metabolites: 2,3-desisopropylidene TPM, 4,5-desisopropylidene TPM, 10-OH TPM and 9-OH TPM in human plasma samples. The most abundant metabolite 2,3-desisopropylidene TPM was isolated from patients urine, characterized and afterwards used as an authentic standard for method development and validation. Sample preparation method employs 100μL of plasma sample and liquid-liquid extraction with a mixture of ethyl acetate and diethyl ether as extraction solvent...
February 3, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28214399/magnetite-platinum-nanoparticles-modified-glassy-carbon-electrode-as-electrochemical-detector-for-nitrophenol-isomers
#2
Giles G Gerent, Almir Spinelli
A glassy carbon electrode was modified with magnetite and platinum nanoparticles stabilized with 3-n-propyl-4-picoline silsesquioxane chloride. This chemically-modified electrode is proposed for the first time for the individual or simultaneous electrochemical detection of nitrophenol isomers. Nanoparticles act as catalysts and also increase the surface area. The polymer stabilizes the particles and provides the electrochemical separation of isomers. Under optimized conditions, the reduction peak currents, obtained by differential-pulse voltammetry, of 2-, 3-, and 4-nitrophenol increased linearly with increases in their concentration in the range of 0...
February 9, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28213803/first-experiences-with-neuropsychological-effects-of-oxytocin-administration-in-childhood-onset-craniopharyngioma
#3
Anika Hoffmann, Jale Özyurt, Kristin Lohle, Julia Reichel, Christiane M Thiel, Hermann L Müller
PURPOSE: The hypothalamic hormone oxytocin plays a major role in regulation of behavior and body composition. Quality of survival is frequently impaired in childhood craniopharyngioma patients due to sequelae such as behavioral deficits and severe obesity caused by tumor or treatment-related hypothalamic lesions. METHODS: In our pilot cross-sectional study, we analyzed emotion recognition abilities and oxytocin concentrations in saliva and urine before and after single nasal administration of 24 IU oxytocin in 10 craniopharyngioma patients...
February 17, 2017: Endocrine
https://www.readbyqxmd.com/read/28213648/-state-of-the-art-in-fluid-and-volume-therapy-a%C3%A2-user-friendly-staged-concept
#4
M Rehm, N Hulde, T Kammerer, A S Meidert, K Hofmann-Kiefer
Adequate fluid therapy is highly important for the perioperative outcome of our patients. Both, hypovolemia and hypervolemia can lead to an increase in perioperative complications and can impair the outcome. Therefore, perioperative infusion therapy should be target-oriented. The main target is to maintain the patient's preoperative normovolemia by using a sophisticated, rational infusion strategy.Perioperative fluid losses should be discriminated from volume losses (surgical blood loss or interstitial volume losses containing protein)...
February 17, 2017: Der Anaesthesist
https://www.readbyqxmd.com/read/28213249/on-line-flow-injection-molecularly-imprinted-solid-phase-extraction-for-the-preconcentration-and-determination-of-1-hydroxypyrene-in-urine-samples
#5
Montserrat Serrano, Mónica Bartolomé, Juan Carlos Bravo, Gema Paniagua, Judith Gañan, Alejandrina Gallego-Picó, Rosa María Garcinuño
New analytical strategies tend to automation of sample pre-treatment and flow analysis techniques provided a number of enhanced analytical methods allowing high throughput. Flow techniques are usually faster, more robust and more flexible than their batch equivalents. In addition, flow methods use less sample and reagent amounts and reduce analytical costs and waste. A flow injection solid-phase extraction pre-concentration system using a molecularly imprinted polymer (MIP) packed micro-column was developed for the determination of 1-hydroxypyrene in human urine with fluorescence detection...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213225/a-melamine-based-molecularly-imprinted-sensor-for-the-determination-of-8-hydroxydeoxyguanosine-in-human-urine
#6
Neeraj Kumar, Rosy, Rajendra N Goyal
A sensitive and facile molecular imprinted sensor has been fabricated using edge plane pyrolytic graphite (EPPG) for the determination of an important oxidative DNA damage product, 8-hydroxydeoxyguanosine (8-OHdG). The molecularly imprinted polymer film was fabricated by electropolymerization of melamine in the presence of 8-OHdG, on glutaraldehyde/poly 1,5-diaminonaphthalene modified EPPG. The imprinted sensor surface was characterized by using Field Emission Scanning Electron Microscopy, Electron Impedance Spectroscopy, Cyclic Voltammetry, Square Wave Voltammetry and UV-visible spectroscopy...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213140/a-novel-sensor-for-determination-of-naproxen-based-on-change-in-localized-surface-plasmon-peak-of-functionalized-gold-nanoparticles
#7
Javad Khodaveisi, Ali Mohammad Haji Shabani, Shayessteh Dadfarnia, Dariush Saberi
A highly selective and sensitive colorimetric sensor for the determination of naproxen (NAP) based on the aggregation of the thiolated β-cyclodextrin (Tβ-CD) functionalized gold nanoparticles (Tβ-CD-Au NPs) in the presence of NAP and Zn(2+)is described. The hydrophobic end of NAP interacts with the immobilized Tβ-CD on the Au NPs and forms the complex of Tβ-CD:NAP while the Zn(2+) ions form a 1:2 complex of (NAP)2Zn with the carboxyl groups of NAP resulting in the aggregation of functionalized gold nanoparticles...
February 8, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28210835/a-10-year-review-of-cannabis-exposure-in-children-under-3-years-of-age-do-we-need-a-more-global-approach
#8
Isabelle Claudet, Mathilde Le Breton, Camille Bréhin, Nicolas Franchitto
: Pediatricians working in an emergency environment are confronted with children admitted to emergency departments for intoxication on a daily basis. We carried out a retrospective cohort study of children admitted to a pediatric emergency department due to unintentional cannabis exposure over a 10-year period from 2004 to 2014. Twenty-nine children under the age of 3 were admitted with a positive cannabis urine test. Eighty-seven percent of intoxications occurred at the family home. Resin was the main form of ingested cannabis (69%)...
February 16, 2017: European Journal of Pediatrics
https://www.readbyqxmd.com/read/28210756/high-precision-zinc-stable-isotope-measurement-of-certified-biological-reference-materials-using-the-double-spike-technique-and-multiple-collector-icp-ms
#9
Rebekah E T Moore, Fiona Larner, Barry J Coles, Mark Rehkämper
Biological reference materials with well-characterised stable isotope compositions are lacking in the field of 'isotope biochemistry', which seeks to understand bodily processes that rely on essential metals by determining metal stable isotope ratios. Here, we present Zn stable isotope data for six biological reference materials with certified trace metal concentrations: fish muscle, bovine muscle, pig kidney, human hair, human blood serum and human urine. Replicate analyses of multiple aliquots of each material achieved reproducibilities (2sd) of 0...
February 16, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28210249/feeding-a-high-concentration-diet-induces-unhealthy-alterations-in-the-composition-and-metabolism-of-ruminal-microbiota-and-host-response-in-a-goat-model
#10
Canfeng Hua, Jing Tian, Ping Tian, Rihua Cong, Yanwen Luo, Yali Geng, Shiyu Tao, Yingdong Ni, Ruqian Zhao
There is limited knowledge about the impact of long-term feeding a high-concentrate (HC) diet on rumen microbiota, metabolome, and host cell functions. In this study, a combination of mass spectrometry-based metabolomics techniques, 454 pyrosequencing of 16S rDNA genes, and RT-PCR was applied to evaluate the changes of ruminal microbiota composition, ruminal metabolites, and related genes expression in rumen epithelial cells of lactating goats received either a 35% concentrate diet or a 65% concentrate diet for 4 or 19 weeks, respectively...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28208751/oxidative-stress-related-genetic-variants-may-modify-associations-of-phthalate-exposures-with-asthma
#11
I-Jen Wang, Wilfried J J Karmaus
Background: Phthalate exposure may increase the risk of asthma. Little is known about whether oxidative-stress related genes may alter this association. First, this motivated us to investigate whether genetic polymorphisms of the oxidative-stress related genes glutathione S-transferase Mu 1 (GSTM1), glutathione S-transferase pi 1 (GSTP1), superoxide dismutase 2 (SOD2), catalase (CAT), myeloperoxidase (MPO), and EPHX1 in children are associated with phthalate urine concentrations. Second, we addressed the question whether these genes may affect the influence of phthalates on asthma...
February 8, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28208710/metabolism-of-zearalenone-and-its-major-modified-forms-in-pigs
#12
Sabina B Binder, Heidi E Schwartz-Zimmermann, Elisabeth Varga, Gerlinde Bichl, Herbert Michlmayr, Gerhard Adam, Franz Berthiller
The Fusarium mycotoxin zearalenone (ZEN) can be conjugated with polar molecules, like sugars or sulfates, by plants and fungi. To date, the fate of these modified forms of ZEN has not yet been elucidated in animals. In order to investigate whether ZEN conjugates contribute to the total ZEN exposure of an individual, ZEN (10 µg/kg b.w.) and equimolar amounts of two of its plant metabolites (ZEN-14-O-β-glucoside, ZEN-16-O-β-glucoside) and of one fungal metabolite (ZEN-14-sulfate) were orally administered to four pigs as a single bolus using a repeated measures design...
February 8, 2017: Toxins
https://www.readbyqxmd.com/read/28207721/clinical-anatomy-e-cases-a-five-year-follow-up-of-learning-analytics
#13
Geoffrey Braatvedt, Amelia Tekiteki, Holly Britton, John Wallace, Manish Khanolkar
AIMS: To examine the length of stay and need for intensive care of people admitted with diabetic ketoacidosis (DKA) to a single centre between 1988 and 2011. METHODS: Patients aged ≥15 years admitted for the first time with DKA (plasma glucose ≥ 10mmol/L and a bicarbonate concentration ≤15mmol/L and a pH <7.35, and raised plasma or urine ketones or anion gap) to Auckland City Hospital from 1988-2011 were identified retrospectively. The patients were divided into four cohorts (1988-1996; 1997-2001; 2002-2006; 2007-2011)...
February 17, 2017: New Zealand Medical Journal
https://www.readbyqxmd.com/read/28207572/cross-reactivity-of-chloroquine-and-hydroxychloroquine-with-dri-amphetamine-immunoassay
#14
Isabel Gomila, Loreto Quesada, Victoria López-Corominas, Julia Fernández, Miguel Ángel Servera, Laura Sahuquillo, Macarena Dastis, Albert Torrents, Bernardino Barceló
BACKGROUND: Chloroquine and hydroxychloroquine are medical drugs used to treat the chemoprophylaxis of malaria as well as a second-line anti-inflammatory drug. METHODS: We performed a study of cross-reactivity of chloroquine and hydroxychloroquine in the DRI Amphetamine Assay inspired by a case report of a self-ingestion of chloroquine following a family dispute, that involved the following: (a) an in vitro study with control samples of healthy subjects, (b) an in vivo study with samples of patients with rheumatoid arthritis, and (c) an evaluation of the cross-reactivity of chloroquine and hydroxychloroquine in three additional immunoassays...
February 14, 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28205436/comparison-of-lateral-flow-assay-kidney-inhibition-swab-and-liquid-chromatography-tandem-mass-spectrometry-for-the-detection-of-penicillin-g-residues-in-sow-urine
#15
Weilin L Shelver, Shubhashis Chakrabarty, David J Smith
Sows (n = 126) were administered penicillin G; urine, collected at slaughter, was screened by kidney inhibition swab (KIS; 4 h testing time) and then stored at -80 °C (∼1200 days) until analysis by lateral flow assay (LF, ∼5 min testing time) and tandem quadrupole LC-MS/MS (TQ) analysis. The stability of penicillin in urine during storage was verified using TQ analyses. Quantitative results were well-correlated (R(2) = 0.98) with only a ∼10% decrease in penicillin concentration during the 3-year storage period...
February 16, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28205269/evaluation-and-comparison-of-abbott-jaffe-and-enzymatic-creatinine-methods-could-the-old-method-meet-the-new-requirements
#16
Tuncay Küme, Barıs Sağlam, Cem Ergon, Ali Rıza Sisman
BACKGROUND: The aim of this study is to evaluate and compare the analytical performance characteristics of the two creatinine methods based on the Jaffe and enzymatic methods. METHODS: Two original creatinine methods, Jaffe and enzymatic, were evaluated on Architect c16000 automated analyzer via limit of detection (LOD) and limit of quantitation (LOQ), linearity, intra-assay and inter-assay precision, and comparability in serum and urine samples. The method comparison and bias estimation using patient samples according to CLSI guideline were performed on 230 serum and 141 urine samples by analyzing on the same auto-analyzer...
February 15, 2017: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/28205100/efficacy-of-oral-supplemental-hydration-for-the-prevention-of-contrast-induced-nephropathy-in-rats
#17
Tamaki Matsunami, Kazuo Hino, Rie Dosho, Sho Miyatake, Goro Ebisu, Ryohei Kuwatsuru
PURPOSE: To compare oral rehydration solution (ORS) with saline infusion for preventing contrast-induced nephropathy (CIN) in a rat model. MATERIALS AND METHODS: Adult male Sprague-Dawley rats (310-360 g) received intravenous indomethacin (10 mg/kg), N (G)-nitro-L-arginine methyl ester (10 mg/kg), and iohexol (10 mL/kg) to induce acute contrast-induced renal injury (CIN group); control rats received saline only. For hydration, rats received either continuous infusion (20 mL/kg/h) of saline or three oral doses (20 mL/kg each) of ORS...
February 15, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28202864/clinical-presentation-of-tubulointerstitial-nephritis-caused-by-amyloid-light-chain-amyloidosis-in-a-patient-with-sj%C3%A3-gren-s-syndrome
#18
Reiko Inoue, Yoshihide Fujigaki, Kana Kobayashi, Yoshifuru Tamura, Tatsuru Ota, Shigeru Shibata, Tsuyoshi Ishida, Fukuo Kondo, Yutaka Yamaguchi, Shunya Uchida
We report a 70-year-old woman with Sjögren's syndrome who had severe renal dysfunction with mild proteinuria and elevated urinary low-molecular-weight proteins. Based on these clinical presentations, interstitial nephritis due to Sjögren's syndrome was strongly suspected. Unexpectedly, renal pathology revealed amyloid light-chain (AL) lambda-type depositions predominantly in the vasculatures with severe tubulointerstitial damage. Concentrated urine immunofixation was positive for Bence Jones lambda-type monoclonal proteins...
2017: Internal Medicine
https://www.readbyqxmd.com/read/28202214/lethal-neonatal-case-and-review-of-primary-short-chain-enoyl-coa-hydratase-sceh-deficiency-associated-with-secondary-lymphocyte-pyruvate-dehydrogenase-complex-pdc-deficiency
#19
Jirair K Bedoyan, Samuel P Yang, Sacha Ferdinandusse, Rhona M Jack, Alexander Miron, George Grahame, Suzanne D DeBrosse, Charles L Hoppel, Douglas S Kerr, Ronald J A Wanders
Mutations in ECHS1 result in short-chain enoyl-CoA hydratase (SCEH) deficiency which mainly affects the catabolism of various amino acids, particularly valine. We describe a case compound heterozygous for ECHS1 mutations c.836T>C (novel) and c.8C>A identified by whole exome sequencing of proband and parents. SCEH deficiency was confirmed with very low SCEH activity in fibroblasts and nearly absent immunoreactivity of SCEH. The patient had a severe neonatal course with elevated blood and cerebrospinal fluid lactate and pyruvate concentrations, high plasma alanine and slightly low plasma cystine...
February 2, 2017: Molecular Genetics and Metabolism
https://www.readbyqxmd.com/read/28196478/genetic-analysis-of-impaired-trimethylamine-metabolism-using-whole-exome-sequencing
#20
Yiran Guo, Liang-Dar Hwang, Jiankang Li, Jason Eades, Chung Wen Yu, Corrine Mansfield, Alexis Burdick-Will, Xiao Chang, Yulan Chen, Fujiko F Duke, Jianguo Zhang, Steven Fakharzadeh, Paul Fennessey, Brendan J Keating, Hui Jiang, Hakon Hakonarson, Danielle R Reed, George Preti
BACKGROUND: Trimethylaminuria (TMAU) is a genetic disorder whereby people cannot convert trimethylamine (TMA) to its oxidized form (TMAO), a process that requires the liver enzyme FMO3. Loss-of-function variants in the FMO3 gene are a known cause of TMAU. In addition to the inability to metabolize TMA precursors like choline, patients often emit a characteristic odor because while TMAO is odorless, TMA has a fishy smell. The Monell Chemical Senses Center is a research institute with a program to evaluate people with odor complaints for TMAU...
February 15, 2017: BMC Medical Genetics
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