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https://www.readbyqxmd.com/read/27769466/metal-organic-frameworks-mofs-for-magnetic-solid-phase-extraction-of-pyrazole-pyrrole-pesticides-in-environmental-water-samples-followed-by-hplc-dad-determination
#1
Jiping Ma, Zhidan Yao, Liwei Hou, Wenhui Lu, Qipeng Yang, Jinhua Li, Lingxin Chen
Magnetic metal-organic frameworks (MOFs, [MIL-101]) were prepared and used as magnetic solid-phase extraction (MSPE) adsorbents for preconcentration of four kinds of pyrazole/pyrrole pesticides (flusilazole, fipronil, chlorfenapyr, and fenpyroximate) in environmental water samples, followed by high-performance liquid chromatography-diode-array detector (HPLC-DAD) determination. Several variables affecting MSPE efficiency were systematically investigated, including amount of MIL-101, extraction time, sample pH, salt concentration, type of desorption solvent and desorption number of times...
December 1, 2016: Talanta
https://www.readbyqxmd.com/read/27639523/design-and-construction-of-nanoscale-material-for-ultrasonic-assisted-adsorption-of-dyes-application-of-derivative-spectrophotometry-and-experimental-design-methodology
#2
Ahmad Reza Bagheri, Mehrorang Ghaedi, Arash Asfaram, Ramin Jannesar, Alireza Goudarzi
Response surface methodology (RSM) based on central rotatable experimental design was used to investigate the effect of ultrasound assisted simultaneous adsorption process variables on Cu: ZnS-NPs-AC from aqueous solution. Cu: ZnS-NPs-AC was characterized using field emission scanning electron microscopy (FE-SEM), Energy Dispersive X-ray Spectroscopy (EDX) and X-ray diffraction (XRD). To overcome the severe methylene blue (MB) and brilliant green (BG) dyes spectral overlapping, derivative spectrophotometric method were successfully applied for the simultaneous determination of dyes in their binary solutions...
March 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/27568578/quantitative-analysis-of-biomarkers-of-liver-and-kidney-injury-in-serum-and-urine-using-ultra-fast-liquid-chromatography-with-tandem-mass-spectrometry-coupled-with-a-hydrophilic-interaction-chromatography-column-application-to-monitor-injury-induced-by-euphorbiae
#3
Yuanyuan Zhang, Liqiang Gu, Yu Jiang, Kaishun Bi, Xiaohui Chen
Fast and sensitive monitoring of drug-induced liver and kidney injury in early stage is beneficial. An ultrafast liquid chromatography with tandem mass spectrometry assay was developed and validated to simultaneously determine ten endogenous biomarkers in serum and urine, including hippuric acid, phenylacetylglycine, 5-oxoproline, cholic acid, taurine, indoleacetic acid, 3-indoxyl sulfate, guanidinosuccinic acid, guanidinoacetic acid and uric acid. A CAPCELL CORE PC column (2.1 × 150 mm, 2.7 μm) was adopted for analytes separation...
October 2016: Journal of Separation Science
https://www.readbyqxmd.com/read/27181646/collision-cross-section-prediction-of-deprotonated-phenolics-in-a-travelling-wave-ion-mobility-spectrometer-using-molecular-descriptors-and-chemometrics
#4
Gerard Bryan Gonzales, Guy Smagghe, Sofie Coelus, Dieter Adriaenssens, Karel De Winter, Tom Desmet, Katleen Raes, John Van Camp
The combination of ion mobility and mass spectrometry (MS) affords significant improvements over conventional MS/MS, especially in the characterization of isomeric metabolites due to the differences in their collision cross sections (CCS). Experimentally obtained CCS values are typically matched with theoretical CCS values from Trajectory Method (TM) and/or Projection Approximation (PA) calculations. In this paper, predictive models for CCS of deprotonated phenolics were developed using molecular descriptors and chemometric tools, stepwise multiple linear regression (SMLR), principal components regression (PCR), and partial least squares regression (PLS)...
June 14, 2016: Analytica Chimica Acta
https://www.readbyqxmd.com/read/26814366/magnetic-hydrophilic-lipophilic-balance-sorbent-for-efficient-extraction-of-chemical-warfare-agents-from-water-samples
#5
Varoon Singh, Ajay Kumar Purohit, Sridhar Chinthakindi, Raghavender Goud D, Vijay Tak, Deepak Pardasani, Anchal Roy Shrivastava, Devendra Kumar Dubey
Magnetic hydrophilic-lipophilic balance (MHLB) hybrid resin was prepared by precipitation polymerization using N-vinylpyrrolidone (PVP) and divinylbenzene (DVB) as monomers and Fe2O3 nanoparticles as magnetic material. These resins were successfully applied for the extraction of chemical warfare agents (CWAs) and their markers from water samples through magnetic dispersive solid-phase extraction (MDSPE). By varying the ratios of monomers, resin with desired hydrophilic-lipophilic balance was prepared for the extraction of CWAs and related esters of varying polarities...
February 19, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/26626889/in-vitro-dynamic-pharmacokinetic-pharmacodynamic-pk-pd-study-and-copd-of-marbofloxacin-against-haemophilus-parasuis
#6
Jian Sun, Xia Xiao, Rui-Juan Huang, Tao Yang, Yi Chen, Xi Fang, Ting Huang, Yu-Feng Zhou, Ya-Hong Liu
BACKGROUND: Haemophilus parasuis (H. parasuis) can invade the body and cause systemic infection under stress conditions. Marbofloxacin has been recommended for the treatment of swine infections. However, few studies have investigated the PK/PD characteristics and PK/PD cutoff (COPD) of this drug against H. parasuis. RESULTS: MICs of marbofloxacin against 198 H. parasuis isolates were determined. The MIC50 and MIC90 were 2 and 8 mg/L, respectively. An in vitro dynamic PK/PD model was established to study the PK/PD relationship of marbofloxacin against H...
2015: BMC Veterinary Research
https://www.readbyqxmd.com/read/26106444/structural-and-spectral-investigations-of-the-recently-synthesized-chalcone-e-3-mesityl-1-naphthalen-2-yl-prop-2-en-1-one-a-potential-chemotherapeutic-agent
#7
Assem Barakat, Abdullah Mohammed Al-Majid, Saied M Soliman, Yahia Nasser Mabkhot, M Ali, Hazem A Ghabbour, Hoong-Kun Fun, Abdul Wadood
BACKGROUND: Chalcones (1,3-diaryl-2-propen-1-ones, represent an important subgroup of the polyphenolic family, which have shown a wide spectrum of medical and industrial application. Due to their redundancy in plants and ease of preparation, this category of molecules has inspired considerable attention for potential therapeutic uses. They are also effective in vivo as anti-tumor promoting, cell proliferating inhibitors and chemo preventing agents. RESULTS: Synthesis and molecular structure investigation of (E)-3-mesityl-1-(naphthalen-2-yl) prop-2-en-1-one (3) is reported...
2015: Chemistry Central Journal
https://www.readbyqxmd.com/read/26076132/transcriptional-slippage-and-rna-editing-increase-the-diversity-of-transcripts-in-chloroplasts-insight-from-deep-sequencing-of-vigna-radiata-genome-and-transcriptome
#8
Ching-Ping Lin, Chia-Yun Ko, Ching-I Kuo, Mao-Sen Liu, Roland Schafleitner, Long-Fang Oliver Chen
We performed deep sequencing of the nuclear and organellar genomes of three mungbean genotypes: Vigna radiata ssp. sublobata TC1966, V. radiata var. radiata NM92 and the recombinant inbred line RIL59 derived from a cross between TC1966 and NM92. Moreover, we performed deep sequencing of the RIL59 transcriptome to investigate transcript variability. The mungbean chloroplast genome has a quadripartite structure including a pair of inverted repeats separated by two single copy regions. A total of 213 simple sequence repeats were identified in the chloroplast genomes of NM92 and RIL59; 78 single nucleotide variants and nine indels were discovered in comparing the chloroplast genomes of TC1966 and NM92...
2015: PloS One
https://www.readbyqxmd.com/read/26012639/cost-effectiveness-of-intra-arterial-treatment-as-an-adjunct-to-intravenous-tissue-type-plasminogen-activator-for-acute-ischemic-stroke
#9
RANDOMIZED CONTROLLED TRIAL
Michelle H Leppert, Jonathan D Campbell, Jennifer R Simpson, James F Burke
BACKGROUND AND PURPOSE: The objective of this study was to determine the cost-effectiveness of intra-arterial treatment within the 0- to 6-hour window after intravenous tissue-type plasminogen activator within 0- to 4.5-hour compared with intravenous tissue-type plasminogen activator alone, in the US setting and from a social perspective. METHODS: A decision analytic model estimated the lifetime costs and outcomes associated with the additional benefit of intra-arterial therapy compared with standard treatment with intravenous tissue-type plasminogen activator alone...
July 2015: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/25911160/spectrophotometric-determination-of-pico-molar-level-of-hydrazine-by-using-alizarin-red-in-water-and-urine-samples
#10
Abraham Daniel Arulraj, Muthunanthevar Vijayan, Vairathevar Sivasamy Vasantha
In this paper, very simple and rapid sensor has been developed for the spectrophotometric determination of pico-molar level of hydrazine using Alizarin red. There was a decrease of optical intensity of the probe in the presence of hydrazine. The LOD is calculated from the linear graph between 5-100 pM as 0.66 pM of hydrazine which is well below the risk level proposed by Agency for Toxic Substance and Disease Registry. The probe selectivity for the detection of hydrazine was tested in the presence of commonly encountered metal ions and anions...
September 5, 2015: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/25818473/performance-evaluation-of-sd-a1ccare-as-a-hba1c-analyzer-for-point-of-care-testing
#11
COMPARATIVE STUDY
Kyunghoon Lee, Sun-Hee Jun, Minje Han, Sang Hoon Song, Kyoung Un Park, Woon Heung Song, Junghan Song
OBJECTIVES: Some studies have shown that a rapid feedback of HbA1c results is helpful for controlling plasma glucose levels. Point-of-care (POC) instruments that are fast, portable, and easy to use are suitable for rapid determination of HbA1c levels. Here, we evaluated the analytical performance of a newly developed POC HbA1c analyzer, SD A1cCare (SD Biosensor, Inc.). DESIGN AND METHODS: The precision, linearity, and correlation with the Variant II Turbo instrument (Bio-Rad Laboratories, Inc...
June 2015: Clinical Biochemistry
https://www.readbyqxmd.com/read/25476282/rapid-analysis-of-trace-organic-compounds-in-water-by-automated-online-solid-phase-extraction-coupled-to-liquid-chromatography-tandem-mass-spectrometry
#12
Tarun Anumol, Shane A Snyder
A fully automated online solid-phase extraction (SPE) with directly coupled liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for analysis of 34 trace organic compounds in diverse water matrices has been developed. The current method offers several advantages over traditional offline SPE methods including low sample volume (1.7 mL), decreased solvent use, higher throughput, and increased reproducibility. The method uses simultaneous positive and negative ESI for analysis of all compounds in one injection, which reduces cycle time (extraction+analysis) to <15 min...
January 2015: Talanta
https://www.readbyqxmd.com/read/25037021/design-crystal-structures-and-magnetic-properties-of-anionic-salts-containing-fullerene-c%C3%A2-%C3%A2-and-indium-iii-bromide-phthalocyanine-radical-anions
#13
Dmitri V Konarev, Alexey V Kuzmin, Salavat S Khasanov, Akihiro Otsuka, Hideki Yamochi, Gunzi Saito, Rimma N Lyubovskaya
Two salts containing fullerene C60 and indium(III) bromide phthalocyanine (Pc) radical anions have been obtained as single crystals: (TBA(+))3(C60˙(-)){In(III)(Br)(Pc)˙(-)}(Br(-))·C6H4Cl2 (1) and (TEA(+))2(C60˙(-)){In(III)(Br)(Pc)˙(-)}·C6H4Cl2·C6H14 (2) where TBA(+) and TEA(+) are tetrabutyl- and tetraethylammonium cations, respectively. The presence of both radical anions is supported by spectra of 1 and 2 in the NIR and IR-ranges. The salts contain zigzag C60˙(-) chains with 10.136 and 10.383 Å center-to-center (ctc) distances in 1 and a uniform ctc distance of 10...
September 14, 2014: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/24971791/the-clinical-and-economic-impact-of-exacerbations-of-chronic-obstructive-pulmonary-disease-a-cohort-of-hospitalized-patients
#14
Francesco Blasi, Giancarlo Cesana, Sara Conti, Virginio Chiodini, Stefano Aliberti, Carla Fornari, Lorenzo Giovanni Mantovani
BACKGROUND: Chronic Obstructive Pulmonary Disease (COPD) is a common disease with significant health and economic consequences. This study assesses the burden of COPD in the general population, and the influence of exacerbations (E-COPD) on disease progression and costs. METHODS: This is a secondary data analysis of healthcare administrative databases of the region of Lombardy, in northern Italy. The study included ≥ 40 year-old patients hospitalized for a severe E-COPD (index event) during 2006...
2014: PloS One
https://www.readbyqxmd.com/read/24522977/high-performance-liquid-chromatography-assay-using-ultraviolet-detection-for-urinary-quantification-of-milrinone-concentrations-in-cardiac-surgery-patients-undergoing-cardiopulmonary-bypass
#15
Paul Gavra, Anne Q N Nguyen, Natasha Beauregard, André Y Denault, France Varin
An analytical assay using liquid-liquid extraction and high-performance liquid chromatography with ultraviolet detection was developed for the quantification of total (conjugated and unconjugated) urinary concentrations of milrinone after the inhalation of a 5 mg dose in 15 cardiac patients undergoing cardiopulmonary bypass. Urine samples (700 μL) were extracted with ethyl-acetate and subsequently underwent acid back-extraction before and after deconjugation by mild acid hydrolysis. Milrinone was separated on a strong cation exchange analytical column...
August 2014: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/24467602/petit-suisse-from-black-soybean-bioactive-compounds-and-antioxidant-properties-during-development-process
#16
COMPARATIVE STUDY
Marsilvio Lima de Moraes Filho, Sabrina Satie Hirozawa, Sandra Helena Prudencio, Elza Iouko Ida, Sandra Garcia
This study aimed to evaluate the antioxidant properties, bioactive compounds and other physico-chemical parameters from black soybean and its derivatives over 30 days under refrigeration at 4 °C and develop a probiotic petit suisse produced from black soybean. The soymilk showed the highest levels of isoflavones (109 mg/100 g), total phenolics (600 mg/100 g) and total anthocyanins (388 mg/100 g) with the highest response in the tests with DPPH• and ABTS+• on a dry basis. There was a significant increase (p ≤ 0...
June 2014: International Journal of Food Sciences and Nutrition
https://www.readbyqxmd.com/read/24430875/do-health-behaviours-change-after-colonoscopy-a-prospective-cohort-study-on-diet-alcohol-physical-activity-and-smoking-among-patients-and-their-partners
#17
MULTICENTER STUDY
Gill Hubbard, Alistair Brown, Anna Campbell, Neil Campbell, Bob Diament, Shona Fielding, Liz Forbat, Lindsey F Masson, Ronan O'Carroll, Kevin Stein, David S Morrison
OBJECTIVES: To describe diet, alcohol, physical activity and tobacco use prospectively, that is, before and 10 months after colonoscopy for patients and their partners. DESIGN: Prospective cohort study of health behaviour change in patients and partners. Comparison groups are patients receiving a normal result notification (NRN) versus patients receiving an abnormal result notification (ARN). Patients and partners (controls) are also compared. SETTING: 5 Scottish hospitals...
January 14, 2014: BMJ Open
https://www.readbyqxmd.com/read/24425887/preparation-and-evaluation-of-antioxidant-activities-of-peptides-obtained-from-defatted-wheat-germ-by-fermentation
#18
Li-Ya Niu, Shao-Tong Jiang, Li-Jun Pan
Defatted wheat germ peptides (DWGPs) were prepared by fermentation with Bacillus Subtilis B1 and the antioxidant activities of DWGPs were investigated. The fermentation condition was optimized by response surface method (RSM) with three factors and three levels according to Box-Behnken theory. A maximal yield of DWGPs was achieved 8.69 mg/mL under optimal conditions: inoculum size 8%, fermentation temperature 31 °C and time 48 h. The main portion in the hydrolysates after fermentation was not free amino acid but peptide...
February 2013: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/23885583/-composition-abundance-and-distribution-of-populations-of-commercially-important-gastropods-in-la-guajira-colombian-caribbean
#19
Ramón Nieto-Bernal, Chasqui Luis, Angélica María Rodriguez, Erick Castro, Diego L Gil-Agudelo
In the continental Colombian Caribbean the conch resource exploitation and the status of snails populations has been poorly studied, which are reflected in the lack of fisheries management. This study assesses composition, population density and distribution of the gastropods species that make conch resource in La Guajira region. Underwater visual censuses for snails were performed between September-November 2009 in 145100x4m (400m2) transects, spanning a total area of 56920m2 between Riohacha and Cabo de la Vela...
June 2013: Revista de Biología Tropical
https://www.readbyqxmd.com/read/23703969/quantification-of-curcumin-demethoxycurcumin-and-bisdemethoxycurcumin-in-rodent-brain-by-uhplc-esi-q-tof-ms-ms-after-intra-nasal-administration-of-curcuminoids-loaded-pnipam-nanoparticles
#20
Niyaz Ahmad, Musarrat Husain Warsi, Zeenat Iqbal, Mohd Samim, Farhan Jalees Ahmad
An ultra high performance liquid chromatography-electrospray ionization-synapt mass spectrometric method (UHPLC/ESI-QTOF-MS/MS) for the analysis of curcumin (Cur), demethoxycurcumin (DMC), bisdemethoxycurcumin (BDMC) in Wistar rat brain homogenate was developed and validated. The chromatographic separation was achieved on a Waters ACQUITY UPLC™ BEH C18 (2.1mm × 100 mm; 1.7μm) column using isocratic mobile phase, consisting of acetonitrile: 10mM ammonium formate: formic acid (90:10:0.05v/v/v), at a flow rate of 0...
March 2014: Drug Testing and Analysis
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