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https://www.readbyqxmd.com/read/28437719/matrix-assisted-laser-desorption-ionization-mass-spectrometric-imaging-of-olanzapine-in-a-single-hair-using-esculetin-as-a-matrix
#1
Hang Wang, Ying Wang, Ge Wang, Lizhi Hong
Matrix-assisted laser desorption/ionization-mass spectrometric imaging (MALDI-MSI) for the analysis of intact hair is a powerful tool for monitoring changes in drug consumption. The embedding of a low drug concentration in the hydrophobic hair matrix makes it difficult to extract and detect, and requires an improved method to increase detection sensitivity. In this study, an MSI method using MALDI-Fourier transform ion cyclotron resonance was developed for direct identification and imaging of olanzapine in hair samples using the positive ion mode...
April 18, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28437653/effects-of-acidic-and-neutral-biochars-on-properties-and-cadmium-retention-of-soils
#2
Fangjie Qi, Zhaomin Dong, Dane Lamb, Ravi Naidu, Nanthi S Bolan, Yong Sik Ok, Cuixia Liu, Naser Khan, M A H Johir, Kirk T Semple
In this study, an acidic biochar and a neutral biochar were applied at 5 wt% into two soils for an 11-month incubation experiment. One Ferrosol soil (Ba) was slightly acidic with low organic matter and the other Dermosol soil (Mt) was slightly alkaline with high organic matter. The acidic (pH = 3.25) wood shaving (WS) biochar had no marked impact on nutrient levels, cation exchange capacity (CEC), pH and acid neutralization capacity (ANC) of either soil. By contrast, the neutral (pH = 7.00) chicken litter (CL) biochar significantly increased major soluble nutrients, pH, ANC of soil Ba...
April 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/28436032/application-of-maldi-tof-ms-for-estimating-the-postmortem-interval-in-rat-muscle-samples
#3
Chengzhi Li, Dong Ma, Kaifei Deng, Yijiu Chen, Ping Huang, Zhenyuan Wang
Estimating the postmortem interval (PMI) is very important in the forensic sciences. Although many approaches have been used for estimating the PMI, accurate PMI calculations are still difficult. In this study, four Sprague Dawley (SD) rats were sacrificed by suffocation, and muscle samples were collected by dissection at various time intervals (0, 48, 96, and 144 h) after death. All samples were probed using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS) to obtain molecular images and data for principal component analysis (PCA)...
April 23, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28435780/highly-active-and-stable-pt-pd-alloy-catalysts-synthesized-by-room-temperature-electron-reduction-for-oxygen-reduction-reaction
#4
Wei Wang, Zongyuan Wang, Jiajun Wang, Chuan-Jian Zhong, Chang-Jun Liu
Carbon-supported platinum (Pt) and palladium (Pd) alloy catalyst has become a promising alternative electrocatalyst for oxygen reduction reaction (ORR) in proton exchange membrane fuel cells. In this work, the synthesis of highly active and stable carbon-supported Pt-Pd alloy catalysts is reported with a room-temperature electron reduction method. The alloy nanoparticles thus prepared show a particle size around 2.6 nm and a core-shell structure with Pt as the shell. With this structure, the breaking of O-O bands and desorption of OH are both promoted in electrocatalysis of ORR...
April 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28434974/proteomic-approach-to-detect-changes-in-hippocampal-protein-levels-in-an-animal-model-of-type-2-diabetes
#5
Sung Min Nam, Dae Young Yoo, Hyun Jung Kwon, Jong Whi Kim, Hyo Young Jung, Dae Won Kim, Ho Jae Han, Moo-Ho Won, Je Kyung Seong, In Koo Hwang, Yeo Sung Yoon
In our previous study, we demonstrated that type 2 diabetes affects blood-brain barrier integrity and ultrastructural morphology in Zucker diabetic fatty (ZDF) rats at 40 weeks of age. In the present study, we investigated the possible candidates for diabetes-related proteins in the hippocampus of ZDF rats and their control littermates (Zucker lean control, ZLC), by using two-dimensional fluorescence difference gel electrophoresis (2D-DIGE) followed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF)...
April 20, 2017: Neurochemistry International
https://www.readbyqxmd.com/read/28434890/brain-lipidomic-changes-after-morphine-cocaine-and-amphetamine-administration-desi-ms-imaging-study
#6
Anna Bodzon-Kulakowska, Anna Antolak, Anna Drabik, Marta Marszalek-Grabska, Jolanta Kotlińska, Piotr Suder
Drug addiction is a complex disorder, evoking significant changes in the proteome of the central nervous system. To check if there are also changes in the lipidomic profiles we used desorption electrospray-MS technique for imaging of the brain slices of rats exposed to morphine, cocaine and amphetamine. Our investigations showed alternative regulation of selected lipid's levels in the central nervous system structures, under the influence of applied drugs. Results of our investigations can show changes in the brain treated with drugs of abuse in the new light, indicating role of the lipids in the addiction development...
April 18, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28434865/allergens-involved-in-the-cross-reactivity-of-aedes-aegypti-with-other-arthropods
#7
Jose Fernando Cantillo, Leonardo Puerta, Sylvie Lafosse-Marin, Jose Luis Subiza, Luis Caraballo, Enrique Fernandez-Caldas
BACKGROUND: Cross-reactivity between Aedes aegypti and mites, cockroaches, and shrimp has been previously suggested, but the involved molecular components have not been fully described. OBJECTIVE: To evaluate the cross-reactivity between A aegypti and other arthropods. METHODS: Thirty-four serum samples from patients with asthma and/or allergic rhinitis were selected, and specific IgE to A aegypti, Dermatophagoides pteronyssinus, Dermatophagoides farinae, Blomia tropicalis, Periplaneta americana...
April 20, 2017: Annals of Allergy, Asthma & Immunology
https://www.readbyqxmd.com/read/28433879/sulfamethoxazole-degradation-in-anaerobic-sulfate-reducing-bacteria-sludge-system
#8
Yanyan Jia, Samir Kumar Khanal, Huiqun Zhang, Guang-Hao Chen, Hui Lu
Sulfamethoxazole (SMX) is one of the most commonly used antibiotics. SMX degradation in sulfate-reducing bacteria (SRB) sludge systems has not been reported so far. This research investigated the SMX degradation using SRB sludge in a sulfate-reducing up-flow sludge bed reactor. Moreover, the mechanisms and kinetics of SMX removal were also investigated using SRB sludge via a series of batch experiments. The results showed that SMX removal was characterized by a rapid sorption onto SRB sludge, and desorption from SRB sludge to aqueous phase until achieving equilibrium, and then followed by slow biodegradation...
April 17, 2017: Water Research
https://www.readbyqxmd.com/read/28433765/geochemical-processes-controlling-the-distribution-and-concentration-of-metals-in-soils-from-a-patagonian-argentina-salt-marsh-affected-by-mining-residues
#9
Yanina L Idaszkin, María Del Pilar Alvarez, Eleonora Carol
Heavy metal pollution that affects salt marshes is a major environmental concern due to its toxic nature, persistence, and potential risk to organisms and to human health. Mining waste deposits originated four decades ago, by the metallurgical extraction of heavy metals, are found near to the San Antonio salt marsh in Patagonia. The aim of the work was to determine the geochemical processes that control the distribution and concentration of Cu, Fe, Pb and Zn in the soils of this Patagonian salt marsh. A survey of the mining waste deposits was carried out where three dumps were identified...
April 20, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28432654/laser-desorption-ionization-mass-spectrometric-imaging-of-endogenous-lipids-from-rat-brain-tissue-implanted-with-silver-nanoparticles
#10
Ludovic Muller, Kathrine Baldwin, Damon C Barbacci, Shelley N Jackson, Aurélie Roux, Carey D Balaban, Bruce E Brinson, Michael I McCully, Ernest K Lewis, J Albert Schultz, Amina S Woods
Mass spectrometry imaging (MSI) of tissue implanted with silver nanoparticulate (AgNP) matrix generates reproducible imaging of lipids in rodent models of disease and injury. Gas-phase production and acceleration of size-selected 8 nm AgNP is followed by controlled ion beam rastering and soft landing implantation of 500 eV AgNP into tissue. Focused 337 nm laser desorption produces high quality images for most lipid classes in rat brain tissue (in positive mode: galactoceramides, diacylglycerols, ceramides, phosphatidylcholines, cholesteryl ester, and cholesterol, and in negative ion mode: phosphatidylethanolamides, sulfatides, phosphatidylinositol, and sphingomyelins)...
April 21, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28431688/thermal-desorption-gas-chromatographic-methodology-for-the-determination-of-residual-solvents-in-mesoporous-silica
#11
Adissu Alemayehu Asfaw, Kris Wolfs, Ann Van Schepdael, Erwin Adams
In this work, thermal desorption-gas chromatography-flame ionization detection (TD-GC-FID) was adapted to enable the determination of residual solvents (RS) in mesoporous silica (MPSi). MPSi is often utilized in various pharmaceutical formulations or drug delivery systems and the accurate determination of RS is an important part of pharmaceutical quality control. Seven commonly used solvents (methanol, ethanol, acetone, isopropanol, dichloromethane, tetrahydrofuran and hexafluoroisopropanol) were evaluated in combination with 3 types of MPSi having pore sizes of 2-3, 15 and 25nm...
April 12, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28431114/molecular-characterization-of-cryptococcus-neoformans-isolated-from-the-environment-in-beijing-china
#12
Hongtao Dou, Huizhu Wang, Shaowei Xie, Xinxin Chen, Zhipeng Xu, Yingchun Xu
The molecular type of environmental Cryptococcus neoformans in Beijing was not clear. Our study aims to reveal the molecular characterization of C. neoformans complex from environment in Beijing, China. A total of 435 samples of pigeon droppings from 11 different homes in Beijing were collected from August to November in 2015. Pigeon droppings were inoculated onto caffeic acid cornmeal agar (CACA) to screen C. neoformans complex. Bruker Biotyper matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) was performed for species identification...
April 20, 2017: Medical Mycology: Official Publication of the International Society for Human and Animal Mycology
https://www.readbyqxmd.com/read/28430150/synthesis-and-self-assembly-of-shape-amphiphiles-based-on-poss-dendron-conjugates
#13
Yu Shao, Minyuan Ding, Yujie Xu, Fangjia Zhao, Hui Dai, Xia-Ran Miao, Shuguang Yang, Hui Li
Shape has been increasingly recognized as an important factor for self-assembly. In this paper, a series of shape amphiphiles have been built by linking polyhedral oligomeric silsesquioxane (POSS) and a dendron via linkers of different lengths. Three conjugates of octahedral silsesquioxanes (T₈-POSS) and dendron are designed and synthesized and are referred to as isobutyl T₈-POSS gallic acid derivatives (BPOSS-GAD-1, BPOSS-GAD-2, BPOSS-GAD-3). These samples have been fully characterized by ¹H-NMR, (13)C-NMR, Fourier transform infrared (FT-IR) spectroscopy and matrix-assisted laser desorption/ionization time of flight (MALDI-TOF) mass spectrometry to establish their chemical identity and purity...
April 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28430138/nanomaterials-as-assisted-matrix-of-laser-desorption-ionization-time-of-flight-mass-spectrometry-for-the-analysis-of-small-molecules
#14
REVIEW
Minghua Lu, Xueqing Yang, Yixin Yang, Peige Qin, Xiuru Wu, Zongwei Cai
Matrix-assisted laser desorption/ionization (MALDI), a soft ionization method, coupling with time-of-flight mass spectrometry (TOF MS) has become an indispensible tool for analyzing macromolecules, such as peptides, proteins, nucleic acids and polymers. However, the application of MALDI for the analysis of small molecules (<700 Da) has become the great challenge because of the interference from the conventional matrix in low mass region. To overcome this drawback, more attention has been paid to explore interference-free methods in the past decade...
April 21, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28429930/enzymatically-debranched-xylans-in-graft-copolymerization
#15
Kuisma Littunen, Galina Mai-Gisondi, Jukka Seppälä, Emma R Master
Wheat arabinoxylan was treated with two α-arabinofuranosidases exhibiting different mode of action to create three different polymeric substrates. These three substrate preparations were characterized by xylopyranose backbone sugars that are (1) singly substituted by arabinose at C2 or C3, (2) doubly substituted by arabinose at C2 and C3, and (3) largely unsubstituted. All xylan preparations were grafted with glycidyl methacrylate using cerium ammonium nitrate and then evaluated in terms of graft yield and adsorption to cellulose surfaces...
April 21, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28429066/atmospheric-pressure-maldi-for-the-noninvasive-characterization-of-carbonaceous-ink-from-renaissance-documents
#16
Giuseppe Grasso, Marzia Calcagno, Alessandro Rapisarda, Roberta D'Agata, Giuseppe Spoto
The analytical methods that are usually applied to determine the compositions of inks from ancient manuscripts usually focus on inorganic components, as in the case of iron gall ink. In this work, we describe the use of atmospheric pressure/matrix-assisted laser desorption ionization-mass spectrometry (AP/MALDI-MS) as a spatially resolved analytical technique for the study of the organic carbonaceous components of inks used in handwritten parts of ancient books for the first time. Large polycyclic aromatic hydrocarbons (L-PAH) were identified in situ in the ink of XVII century handwritten documents...
April 21, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28428985/strain-capacitance-relationship-in-polymer-actuators-based-on-single-walled-carbon-nanotubes-and-ionic-liquid-gels
#17
Hyacinthe Randriamahazaka, Kinji Asaka
We investigate the electromechanical properties of bucky-gel electrochemical actuators incorporating various amounts of single-walled carbon nanotubes and an ionic liquid electrolyte, 1-butyl-3-methylimidazolium tetrafluoroborate, that are able to convert electrochemical energy into mechanical energy. The interplay between mechanical and electrochemical effects is studied. The electromechanical responses are investigated by means of electrochemical impedance spectroscopy and bending displacement measurements...
April 21, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28427796/molecular-methods-for-septicemia-diagnosis
#18
Francesc Marco
Septicemia remains a major cause of hospital mortality. Blood culture remains the best approach to identify the etiological microorganisms when a bloodstream infection is suspected but it takes long time because it relies on bacterial or fungal growth. The introduction in clinical microbiology laboratories of the matrix-assisted laser desorption ionization time-of-flight mass spectrometry technology, DNA hybridization, microarrays or rapid PCR-based test significantly reduce the time to results. Tests for direct detection in whole blood samples are highly desirable because of their potential to identify bloodstream pathogens without waiting for blood cultures to become positive...
April 17, 2017: Enfermedades Infecciosas y Microbiología Clínica
https://www.readbyqxmd.com/read/28427685/fe3o4-hydroxyapatite-graphene-quantum-dots-as-a-novel-nano-sorbent-for-preconcentration-of-copper-residue-in-thai-food-ingredients-optimization-of-ultrasound-assisted-magnetic-solid-phase-extraction
#19
Phitchan Sricharoen, Nunticha Limchoowong, Yonrapach Areerob, Prawit Nuengmatcha, Suchila Techawongstien, Saksit Chanthai
Fe3O4/hydroxyapatite/graphene quantum dots (Fe3O4/HAP/GQDs) nanocomposite was synthesized and used as a novel magnetic adsorbent. This nanocomposite was characterized using scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, and magnetization property. The Fe3O4/HAP/GQDs was applied to pre-concentrate copper residues in Thai food ingredients (so-called "Tom Yum Kung") prior to determination by inductively coupled plasma-atomic emission spectrometry...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427632/ultrasonic-treatment-of-cofe2o4-b2o3-sio2-as-a-new-hybrid-magnetic-composite-nanostructure-and-catalytic-application-in-the-synthesis-of-dihydroquinazolinones
#20
Ali Maleki, Morteza Aghaei, Hamid Reza Hafizi-Atabak, Mohammad Ferdowsi
New hybrid magnetic composite nanostructure are prepared via ultrasonic treatment by glass-ceramic method, characterized by field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), energy-dispersive X-ray (EDX), element distribution image (EDX mapping), thermal gravimetric analysis (TGA)/differential thermal analysis (DTA) and N2 adsorption-desorption by Brunauer-Emmett-Teller (BET) analyses. Then, the catalytic activity of the prepared CoFe2O4@B2O3-SiO2 nanoparticles was tested in the synthesis of 2-substituted-3-(phenylamino)-dihydroquinazolin-4(1H)-ones in deep eutectic solvent (DES) based on choline chloride as an eco-friendly and recyclable media...
July 2017: Ultrasonics Sonochemistry
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