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https://www.readbyqxmd.com/read/28342611/short-communication-identification-of-corynebacterium-bovis-by-matrix-assisted-laser-desorption-ionization-mass-spectrometry
#1
Helio Langoni, Carolina Polo Camargo da Silva, Marcella Zampoli Troncarelli, Alessandra Tata, Katia Roberta Anacleto Belaz, Marcos Nogueira Eberlin, Samea Fernandes Joaquim, Felipe Freitas Guimarães, Renata Bonini Pardo, Eduardo Nardini Gomes
Corynebacterium bovis is a mastitis-causing microorganism responsible for economic losses related to decrease in milk production. The aim of the study was identify Corynebacterium spp. strains recovered from milk samples of subclinical mastitis by using matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS). Samples were collected during a 10-mo mastitis-monitoring program in a high-production dairy farm. In this study, 80 strains were analyzed; from these 54 (67.5%) were identified at species level as Corynebacterium bovis, 24 (31...
March 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28342095/-advances-in-diagnostic-microbiology-opportunities-and-limitations
#2
F P Maurer, M Hentschke, H Rohde
In the light of ever increasing problems related to the emergence of multidrug-resistant bacteria, rapid microbiological diagnostics are of growing importance. Timely pathogen detection and availability of susceptibility data are essential for optimal treatment, but are even more crucial for de-escalation of broad spectrum empiric therapies. Medical microbiology is, thus, an integral part of antimicrobial stewardship programs. Traditional microbiological techniques for species identification and susceptibility testing rely on bacterial growth and are, thus, characterized by inherent slowness...
March 24, 2017: Medizinische Klinik, Intensivmedizin und Notfallmedizin
https://www.readbyqxmd.com/read/28342079/remediation-of-pcb-contaminated-soil-using-a-combination-of-mechanochemical-method-and-thermal-desorption
#3
Zhong-Hua Zhao, Xiao-Dong Li, Ming-Jiang Ni, Tong Chen, Jian-Hua Yan
The combination of mechanochemical method and thermal desorption for remediating polychlorinated biphenyls (PCBs) in contaminated soil was tested in this study. The effects of grinding time and heating time on PCB removal efficiency were investigated. The contaminated soil, mixed with CaO powder at a weight ratio of 1:1, was first ground using a planetary ball mill. After 4 h of grinding, the total PCB concentration and its toxic equivalence quantity (TEQ) decreased by 74.6 and 75.8%, respectively. Then, after being heated at 500 °C for 60 min, the residual PCBs in mechanochemical + thermal treated soil decreased to 247 ng/g, resulting in a removal efficiency of 99...
March 24, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28341987/a-facile-synthesis-of-novel-three-dimensional-magnetic-imprinted-polymers-for-rapid-extraction-of-bovine-serum-albumin-in-bovine-calf-serum
#4
Liang Yan, Jing Wang, Piaopiao Lv, Dandan Xie, Zhaohui Zhang
A novel three-dimensional (3D) magnetic imprinted polymer was prepared with bovine serum albumin as the template molecule, dopamine as the functional monomer, and a graphene oxide and carbon nanotube hybrid 3D nanocomposite as the carrier. The preparation conditions for the 3D magnetic molecularly imprinted polymers were optimized. The 3D magnetic molecularly imprinted polymers were characterized in detail by scanning electron microscopy, Fourier transform infrared spectroscopy, and vibrating sample magnetometry...
March 24, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28341601/advances-in-maldi-imaging-mass-spectrometry-of-proteins-in-cardiac-tissue-including-the-heart-valve
#5
REVIEW
Peggi M Angel, H Scott Baldwin, Danielle Gottlieb, Yan Ru Su, John E Mayer, David Bichell, Richard R Drake
Significant progress has been made for tissue imaging of proteins using matrix-assisted laser desorption ionization imaging mass spectrometry (MALDI IMS). These advancements now facilitate mapping of a wide range of proteins, peptides, and post-translational modifications in a wide variety of tissues; however, the use of MALDI IMS to detect proteins from cardiac tissue is limited. This review discusses the most recent advances in protein imaging and demonstrates application to cardiac tissue, including the heart valve...
March 21, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28341327/importance-of-the-structure-and-nanoporosity-of-organic-matter-on-the-desorption-kinetics-of-benzo-a-pyrene-in-sediments
#6
Youda Huang, Dainan Zhang, Dandan Duan, Yu Yang, Yongqiang Xiong, Yong Ran
The desorption kinetics and mechanism were investigated using a Tenax extraction technique on different sediments spiked with radiocarbon-labeled benzo[a]pyrene (BaP). Five sedimentary fractions were sequentially fractionated, and the only nonhydrolyzable organic carbon fractions (NHC) were characterized using advanced solid-state (13)C nuclear magnetic resonance spectroscopy (NMR), improved six end-member model, and a CO2 gas adsorption technique. The sediments contained high percentages of algaenan and/or sporopollenin but low percentages of black carbon and lignin...
March 22, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28341192/potential-infection-control-risks-associated-with-ultrasound-equipment-a-bacterial-perspective
#7
Susan Campbell Westerway, Jocelyne M Basseal, Adam Brockway, Jon A Hyett, Dee A Carter
Ultrasound equipment used in trans-abdominal (TA) and trans-vaginal (TV) examination may carry bacterial contamination and pose risks to infection control during ultrasound examination. We aimed to describe the prevalence of bacterial contamination on ultrasound probes, gel, machine keyboard and cords and examined the effectiveness of low- and high-level disinfection techniques. This study was performed at a public hospital and a private practice. A total of 171 swabs were analyzed and bacterial species were identified using matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) analysis and polymerase chain reaction (PCR)...
February 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28340789/a-new-and-efficient-solid-phase-microextraction-approach-for-analysis-of-high-fat-content-food-samples-using-a-matrix-compatible-coating
#8
Selenia De Grazia, Emanuela Gionfriddo, Janusz Pawliszyn
The current work presents the optimization of a protocol enabling direct extraction of avocado samples by a new Solid Phase Microextraction matrix compatible coating. In order to further extend the coating life time, pre-desorption and post-desorption washing steps were optimized for solvent type, time, and degree of agitation employed. Using optimized conditions, lifetime profiles of the coating related to extraction of a group of analytes bearing different physical-chemical properties were obtained. Over 80 successive extractions were carried out to establish coating efficiency using PDMS/DVB 65µm commercial coating in comparison with the PDMS/DVB/PDMS...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340788/rapid-identification-and-desorption-mechanisms-of-nitrogen-based-explosives-by-ambient-micro-fabricated-glow-discharge-plasma-desorption-ionization-mfgdp-mass-spectrometry
#9
CaiYan Tian, JinWei Yin, ZhongJun Zhao, Yinchenxi Zhang, YiXiang Duan
A novel technique of micro-fabricated glow discharge plasma desorption/ionization mass spectrometry was investigated for the first time in negative ion mode in this study. Negative ion micro-fabricated glow discharge plasma desorption/ionization mass spectrometry (NI-MFGDP-MS) was successfully applied to identify trace explosives in open air. Six explosives and explosives-related compounds were directly analyzed in seconds with this ion source. The ions of [M-H](-) were predominant for 2-methyl-1,3,5-trinitrobenzene (trinitrotoluene, TNT) and 2,4,6-trinitrophenol (picric acid), and [M+NO3](-) were dominant ions for 1,3,5-trinitro-perhydro-1,3,5-triazine (cyclonite, RDX), octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (octogen, HMX), 1,2,3-trinitroxypropane (nitroglycerin, NG), and pentaerythritol tetranitrate (PETN)...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340770/a-novel-polyaniline-polypyrrole-graphene-oxide-fiber-for-the-determination-of-volatile-organic-compounds-in-headspace-gas-of-lung-cell-lines
#10
JingHong Li, Hui Xu
Exploration of volatile organic compounds (VOCs) generated by lung cell lines is a powerful and non-invasive tool for the detection of potential volatile biomarkers of lung cancer. In this study, a simple and sensitive solid phase microextraction-gas chromatography-mass spectrometry (SPME-GC-MS) method was developed for the determination of VOCs in the headspace gas of lung cell lines. For the purpose of preconcentration, a novel polyaniline/polypyrrole/graphene oxide (PANI/PPy/GO) coating was prepared on the surface of stainless steel fiber via in-situ electrochemical deposition for the first time...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340758/versatile-magnetic-carbon-nanotubes-for-sampling-and-pre-concentration-of-pesticides-in-environmental-water
#11
Frederico Hayala Fernandes Barbosa, Helvécio Costa Menezes, Ana Paula de Carvalho Teixeira, Philippe Serp, Vitor Antipoff, Zenilda de Lourdes Cardeal
This article describes a simple, efficient, and versatile magnetic carbon nanotubes (MCNT) method for sampling and pre-concentration of pesticides in environmental water samples. The multi-walled magnetic carbon nanotubes were obtained by chemical deposition vapor (CVD) process. The MCNTs structures are formed of hydrophobic and hydrophilic fractions that provide great dispersion at any water matrix allowing simultaneously a high efficiency of pesticides sorption. Following the extraction, analytes were desorbed with minor amounts of solvent and analyzed by gas chromatography coupled mass spectrometry (GC/MS)...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340741/controlled-synthesis-of-hollow-porous-carbon-spheres-for-enrichment-and-simultaneous-determination-of-nine-bisphenols-from-real-samples
#12
Zhenzhen Zhang, Jing Zhang, Yang Wang, Yao Tong, Lei Zhang
An extended one-step Stőber method was utilized for the preparation of core@shell spheres, which was made up of a thin layer of resorcinol-formaldehyde (RF) and a silica core. After the carbonization and template-removal process, hollow porous carbon spheres (HPCSs) were synthesized. The structure of HPCSs was characterized by scanning/transmission electron microscopy and N2 adsorption/desorption isotherms, Fourier transform infrared spectroscopy, energy dispersive X-ray spectrometer and Raman spectroscopy...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340728/ferrocene-graphene-sheets-for-high-efficiency-quenching-of-electrochemiluminescence-from-au-nanoparticles-functionalized-cadmium-sulfide-flower-like-three-dimensional-assemblies-and-sensitive-detection-of-prostate-specific-antigen
#13
Jiu-Jun Yang, Jun-Tao Cao, Hui Wang, Yan-Ming Liu, Shu-Wei Ren
A signal-switchable electrochemiluminescence (ECL) aptasensor was presented for sensitive prostate specific antigen (PSA) assay using ferrocene-graphene sheets (Fc-GNs) for high-efficiency quenching of ECL from Au nanoparticles functionalized cadmium sulfide flower-like three dimensional (3D) assemblies (Au-CdS flower-like 3D assemblies). Au-CdS flower-like 3D assemblies were synthesized and employed as luminophore, exhibiting strong and stable ECL intensity, and followed by assembling captured DNA (cDNA) and hybridizing it with half of base sequence of PSA aptamer on the Au-CdS flower-like 3D assemblies modified electrode...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340309/analytical-techniques-in-lipidomics-state-of-the-art
#14
Kamil Jurowski, Kamila Kochan, Justyna Walczak, Małgorzata Barańska, Wojciech Piekoszewski, Bogusław Buszewski
Current studies related to lipid identification and determination, or lipidomics in biological samples, are one of the most important issues in modern bioanalytical chemistry. There are many articles dedicated to specific analytical strategies used in lipidomics in various kinds of biological samples. However, in such literature, there is lack of articles dedicated to a comprehensive review of the actual analytical methodologies used in lipidomics. The aim of this article is to characterize the lipidomics methods used in modern bioanalysis according to the methodological point of view: 1) chromatography/separation methods, 2) spectroscopic methods and 3) mass spectrometry and also hyphenated methods...
March 24, 2017: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/28338329/evidence-for-electron-hole-pair-excitation-in-the-associative-desorption-of-h2-and-d2-from-au-111
#15
Quan Shuai, Sven Kaufmann, Daniel J Auerbach, Dirk Schwarzer, Alec M Wodtke
The dissociative adsorption reaction of hydrogen on noble metals is believed to be well-described within the Born-Oppenheimer approximation. In this work, we have experimentally derived translational energy distributions for selected quantum states of H2 and D2 formed in associative desorption reactions at a Au(111) surface. Using the principle of detailed balance, we compare our results to theory carried out at the same level of sophistication as was done for the reaction on copper. The theory predicts translational excitation that is much higher than is seen in experiment and fails to reproduce the experimentally observed isotope effect...
March 27, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28338328/polysulfide-breathing-dual-conductive-heterolayered-battery-separator-membranes-based-on-0d-1d-mingled-nanomaterial-composite-mats
#16
Jeong-Hoon Kim, Gwan Yeong Jung, Yong-Hyeok Lee, Jung-Hwan Kim, Sun-Young Lee, Sang Kyu Kwak, Sang-Young Lee
Facile/sustainable utilization of sulfur active materials is an ultimate challenge in high-performance lithium-sulfur (Li-S) batteries. Here, as a membrane-driven approach to address this issue, we demonstrate a new class of polysulfide-breathing (capable of reversibly adsorbing and desorbing polysulfides)/dual (electron and ion)-conductive, heterolayered battery separator membranes (denoted as "MEC-AA separators") based on 0D (nanoparticles)/1D (nanofibers) composite mats. The MEC-AA separator is fabricated through an in-series, concurrent electrospraying/electrospinning process...
March 24, 2017: Nano Letters
https://www.readbyqxmd.com/read/28337625/using-fluorescent-dyes-as-proxies-to-study-herbicide-removal-by-sorption-in-buffer-zones
#17
Jeanne Dollinger, Cécile Dagès, Marc Voltz
The performance of buffer zones for removing pesticides from runoff water varies greatly according to landscape settings, hydraulic regime, and system design. Evaluating the performance of buffers for a range of pesticides and environmental conditions can be very expensive. Recent studies suggested that the fluorescent dyes uranine and sulforhodamine B could be used as cost-effective surrogates of herbicides to evaluate buffer performance. However, while transformation mechanisms in buffers have been extensively documented, sorption processes of both dyes have rarely been investigated...
March 23, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28337401/a-rapid-approach-for-fabricating-boronic-acid-functionalized-plates-for-on-probe-detection-of-glycoprotein-and-glycopeptide
#18
Yu-Ching Liu, Chao-Jung Chen
We developed a rapid and simple approach without using complex mechanical or chemical protocols to fabricate boronic acid-functionalized plates for glycoprotein or glycopeptide enrichment and mass spectrometry (MS) analysis. By coating the boronic acid-functionalized silica particles on a polydimethylsiloxane (PDMS)-coated matrix-assisted laser desorption/ionization (MALDI) plate, these particles can form a firmly monolayer of particles on PDMS membrane for sample handling without peeling off. The boronic acid particles-coated PDMS plate (BP plate) was successfully applied to the enrichment of horseradish peroxidase (HRP) protein and their digested glycopeptides...
2017: Mass Spectrometry
https://www.readbyqxmd.com/read/28337399/clinical-application-of-ambient-ionization-mass-spectrometry
#19
Li-Hua Li, Hua-Yi Hsieh, Cheng-Chih Hsu
Ambient ionization allows mass spectrometry analysis directly on the sample surface under atmospheric pressure with almost zero sample pretreatment. Since the development of desorption electrospray ionization (DESI) in 2004, many other ambient ionization techniques were developed. Due to their simplicity and low operation cost, rapid and on-site clinical mass spectrometry analysis becomes real. In this review, we will highlight some of the most widely used ambient ionization mass spectrometry approaches and their applications in clinical study...
2017: Mass Spectrometry
https://www.readbyqxmd.com/read/28337398/desorption-in-mass-spectrometry
#20
Dilshadbek Tursunbayevich Usmanov, Satoshi Ninomiya, Lee Chuin Chen, Subhrakanti Saha, Mridul Kanti Mandal, Yuji Sakai, Rio Takaishi, Ahsan Habib, Kenzo Hiraoka, Kentaro Yoshimura, Sen Takeda, Hiroshi Wada, Hiroshi Nonami
In mass spectrometry, analytes must be released in the gas phase. There are two representative methods for the gasification of the condensed samples, i.e., ablation and desorption. While ablation is based on the explosion induced by the energy accumulated in the condensed matrix, desorption is a single molecular process taking place on the surface. In this paper, desorption methods for mass spectrometry developed in our laboratory: flash heating/rapid cooling, Leidenfrost phenomenon-assisted thermal desorption (LPTD), solid/solid friction, liquid/solid friction, electrospray droplet impact (EDI) ionization/desorption, and probe electrospray ionization (PESI), will be described...
2017: Mass Spectrometry
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