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https://www.readbyqxmd.com/read/29790331/development-of-an-electrochemical-paper-based-analytical-device-for-trace-detection-of-virus-particles
#1
Robert B Channon, Yuanyuan Yang, Kristen M Feibelman, Brian J Geiss, David S Dandy, Charles S Henry
Viral pathogens are a serious health threat around the world, particularly in resource limited settings, where current sensing approaches are often insufficient and slow, compounding the spread and burden of these pathogens. Here, we describe a la-bel-free, point-of-care approach towards detection of virus particles, based on a microfluidic paper-based analytical device with integrated microwire Au electrodes. The device is initially characterized through capturing of streptavidin modified na-noparticles by biotin-modified microwires...
May 23, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29786486/one-year-retention-of-gadolinium-in-the-brain-comparison-of-gadodiamide-and-gadoterate-meglumine-in-a-rodent-model
#2
Philippe Robert, Stefanie Fingerhut, Cécile Factor, Véronique Vives, Justine Letien, Michael Sperling, Marlène Rasschaert, Robin Santus, Sébastien Ballet, Jean-Marc Idée, Claire Corot, Uwe Karst
Purpose To compare the long-term brain elimination kinetics and gadolinium species in healthy rats after repeated injections of the contrast agents gadodiamide (a linear contrast agent) or gadoterate (a macrocyclic contrast agent). Materials and Methods Nine-week-old rats received five doses of 2.4 mmol gadolinium per kilogram of body weight over 5 weeks and were followed for 12 months with T1-weighted MRI (n = 140 rats, corresponding to seven time points, two contrast agents, and 10 rats per group). Animals were sacrificed at 1 week, 1 month, and 2, 3, 4, 5, and 12 months after the last injection...
May 17, 2018: Radiology
https://www.readbyqxmd.com/read/29784402/zinc-ii-based-metal-organic-nanotubes-coating-for-high-sensitive-solid-phase-microextraction-of-nitro-polycyclic-aromatic-hydrocarbons
#3
Xia Wang, Wan-Ru Sheng, Xiao-Yun Jiao, Ru-Song Zhao, Ming-Lin Wang, Jin-Ming Lin
Metal-organic nanotubes (MONTs) have great potential for solid phase microextraction (SPME) on account of high specific surface area, tunable pore sizes, and exceptional thermal and chemical stability. In this work, zinc (II)-based metal-organic nanotubes (Zn-MONTs) were used as an adsorbent for the SPME of nitro-polycyclic aromatic hydrocarbons (NPAHs) at trace levels from environmental water samples. Gas chromatography-mass spectrometry was used for sample analysis and key factors were investigated and optimized...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784345/development-of-dried-serum-spot-sampling-techniques-for-the-assessment-of-trace-elements-in-serum-samples-by-la-icp-ms
#4
María Pilar Chantada-Vázquez, Jorge Moreda-Piñeiro, Alicia Cantarero-Roldán, Pilar Bermejo-Barrera, Antonio Moreda-Piñeiro
A novel approach for serum analysis by dried matrix spot (DMS) technique is proposed. The methodology consists of sampling filter paper discs (2.7 mm in diameter) containing the large amount of serum retained after a single spotting. Several oxidizers (sodium chlorate, sodium azide, acetic acid, formic acid, 1-butyl-3-methylimidazoliumm chloride/bromide) were tested (oxidizers premixed with the sample before spotting, and papers previously soaked in concentrated additive/oxidizer solutions). Direct multi-element determination (Al, Be, Ca, Cu, Fe, K, Li, Mg, Mn, Mo, Na, P, Rb, Se, V, and Zn) in dried serum spots at very low levels was therefore assessed by laser ablation (LA) coupled with inductively coupled plasma - mass spectrometry (ICP-MS)...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29781254/determination-of-carbon-isotope-ratios-for-honey-samples-by-means-of-a-liquid-chromatography-isotope-ratio-mass-spectrometry-system-coupled-with-a-post-column-pump
#5
Hiroto Kawashima, Momoka Suto, Nana Suto
RATIONALE: Liquid chromatography/isotope ratio mass spectrometry (LC/IRMS) has been used to authenticate and trace products such as honey, wine, and lemon juice, and compounds such as caffeine and pesticides. However, LC/IRMS has several disadvantages, including the high cost of the CO2 membrane and blocking by solidified sodium persulfate. Here, we developed an improved system for determining carbon isotope ratios by LC/IRMS. METHODS: The main improvement was the use of a post-column pump...
May 20, 2018: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/29781092/assimilation-of-nitrogen-and-carbon-isotopes-from-fish-diets-to-otoliths-as-measured-by-nanoscale-secondary-ion-mass-spectrometry
#6
Jen-Chieh Shiao, Kotaro Shirai, Kentaro Tanaka, Naoto Takahata, Yuji Sano, Sung-Yun Hsiao, Der-Chuen Lee, Yung-Che Tseng
RATIONALE: Nitrogen and carbon stable isotope ratios (δ15 N and δ13 C values) of carbonate-bound organic materials in otoliths can provide information to address the biological and ecological functions of fish. Correct interpretation of otolith δ15 N and δ13 C profiles requires knowledge of the metabolic routes of nitrogen and carbon isotopes. However, the isotopic assimilation of δ15 N and δ13 C compositions from diets to otoliths has rarely been investigated. METHODS: This study traced the daily nitrogen and carbon isotopic assimilation between diets and otoliths using nanoscale secondary ion mass spectrometry (NanoSIMS)...
May 21, 2018: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/29779386/gas-analysis-by-electron-ionization-combined-with-chemical-ionization-in-a-compact-ft-icr-mass-spectrometer
#7
Michel Heninger, Hélène Mestdagh, Essyllt Louarn, Gérard Mauclaire, Pierre Boissel, Julien Leprovost, Elsa Bauchard, Sebastien Thomas, Joel Lemaire
In this paper, a compact Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer based on a permanent magnet is presented. This instrument has been developed for real-time analysis of gas emissions. The instrument is well suited to industrial applications or analysis of toxic and complex samples where the concentrations can vary rapidly on a wide range. The novelty of this instrument is the ability to use either electron ionization (EI) or chemical ionization (CI) individually or both of them alternatively...
May 20, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29776546/recent-advances-in-analytical-methods-for-the-determination-of-4-alkylphenols-and-bisphenol-a-in-solid-environmental-matrices-a-critical-review
#8
REVIEW
N Salgueiro-González, S Castiglioni, E Zuccato, I Turnes-Carou, P López-Mahía, S Muniategui-Lorenzo
The problem of endocrine disrupting compounds (EDCs) in the environment has become a worldwide concern in recent decades. Besides their toxicological effects at low concentrations and their widespread use in industrial and household applications, these pollutants pose a risk for non-target organisms and also for public safety. Analytical methods to determine these compounds at trace levels in different matrices are urgently needed. This review critically discusses trends in analytical methods for well-known EDCs like alkylphenols and bisphenol A in solid environmental matrices, including sediment and aquatic biological samples (from 2006 to 2018)...
September 18, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29776455/optimization-and-validation-of-an-analytical-method-for-the-determination-of-some-trace-and-toxic-elements-in-canned-fruit-juices-using-quadrupole-inductively-coupled-plasma-mass-spectrometer
#9
Eglal R Souaya, Mona A Khorshed, Mahmoud M Ghuniem
Background: There is increasing concern about the health effects on humans due to continuous consumption of fruit juices contaminated with metals. Objective: Quadrupole inductively coupled mass spectrometry (Q-ICP-MS) was optimized, validated, and applied in routine analysis for determination of As, Pb, Cd, Sb, Hg, Cu, Zn, Fe, Al, Cr, Sn, Co, Mn, and Ni in fruit juice beverages. Methods: Several validation parameters, such as detection limits (DLs), quantification limits, linearity, accuracy, and measurement uncertainty (MU), were studied under optimized Q-ICP-MS conditions...
May 18, 2018: Journal of AOAC International
https://www.readbyqxmd.com/read/29774656/accurate-and-sensitive-determination-of-selected-hormones-endocrine-disruptors-and-pesticides-by-gc-ms-after-the-multivariate-optimization-of-switchable-solvent-liquid-phase-microextraction
#10
Dotse Selali Chormey, Süleyman Bodur, Dilgeş Baskın, Merve Fırat, Sezgin Bakırdere
Switchable solvent liquid-phase microextraction was combined with gas chromatography and mass spectrometry to improve the sensitivity and accuracy for the determination of selected endocrine disruptors, pesticides and hormones. The extraction method was used to complement gas chromatography with mass spectrometry by preconcentrating analytes for trace determinations. A Box-Behnken experimental design was used to evaluate the main variables and their interaction effects, and optimum parameters were selected based on the model of experimented results...
May 17, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29773171/determination-of-toxic-and-essential-trace-elements-in-serum-of-healthy-and-hypothyroid-respondents-by-icp-ms-a-chemometric-approach-for-discrimination-of-hypothyroidism
#11
Aleksandar Stojsavljević, Jelena Trifković, Zorica Rasić-Milutinović, Dragana Jovanović, Gradimir Bogdanović, Jelena Mutić, Dragan Manojlović
Inductively coupled plasma-mass spectrometry ((ICP-MS)) was used to determine three toxic (Ni, As, Cd) and six essential trace elements (Cr, Mn, Co, Cu, Zn, Se) in blood serum of patients with hypothyroidism (Hy group) and healthy people (control group), in order to set the experimental conditions for accurate determination of a unique profile of these elements in hypothyroidism. Method validation was performed with standard reference material of the serum by varying the sample treatment with both standard and collision mode for analysis of elements isotopes...
July 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29769633/chemical-fingerprints-of-cold-physical-plasmas-an-experimental-and-computational-study-using-cysteine-as-tracer-compound
#12
J-W Lackmann, K Wende, C Verlackt, J Golda, J Volzke, F Kogelheide, J Held, S Bekeschus, A Bogaerts, V Schulz-von der Gathen, K Stapelmann
Reactive oxygen and nitrogen species released by cold physical plasma are being proposed as effectors in various clinical conditions connected to inflammatory processes. As these plasmas can be tailored in a wide range, models to compare and control their biochemical footprint are desired to infer on the molecular mechanisms underlying the observed effects and to enable the discrimination between different plasma sources. Here, an improved model to trace short-lived reactive species is presented. Using FTIR, high-resolution mass spectrometry, and molecular dynamics computational simulation, covalent modifications of cysteine treated with different plasmas were deciphered and the respective product pattern used to generate a fingerprint of each plasma source...
May 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29767157/dietary-glutamine-glutamic-acid-and-nucleotide-supplementation-accelerate-carbon-turnover-%C3%AE-13-c-on-stomach-of-weaned-piglets
#13
Amanda D Assoni, Alessandro B Amorim, Mayra A D Saleh, Marcos L P Tse, Dirlei A Berto
The use of stable isotope analysis as a tool for characterization of carbon turnover (δ13 C) in piglet's tissues by tracing its feeding system has drawn attention. Thus, this study aimed at evaluating the influence of dietary glutamine, glutamic acid and nucleotides supplementation on carbon turnover in fundic-stomach region of weaned piglets at an average age of 21 days. The diets consisted of additive-free diet - control (C); 1% glutamine (G); 1% glutamic acid (GA) and 1% nucleotides (Nu). At weaning day (day 0: baseline), 3 piglets were slaughtered to quantify the δ13 C of stomach...
September 2017: Animal nutrition
https://www.readbyqxmd.com/read/29766425/distribution-of-linear-alkylbenzenes-as-a-domestic-sewage-molecular-marker-in-surface-sediments-of-international-anzali-wetland-in-the-southwest-of-the-caspian-sea-iran
#14
Alireza Riyahi Bakhtiari, Islam Javedankherad, Jahangard Mohammadi, Roholla Taghizadeh
Due to directly receiving high volume of untreated urban and industrial sewage and in turn transferring the pollutants to fish and back to humans, the International Anzali Wetland has been considered to be urgently registered in the Montreux Record. Hence, the present study was aimed to determine the spatial distribution of the linear alkylbenzenes (LABs) in surface sediments of the wetland and its sewage contamination situation. The surface sediments (sampling stations = 167) were collected from the western, eastern, southwest, and central regions of the wetland...
May 15, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29766324/a-general-lc-ms-ms-method-for-monitoring-potential-%C3%AE-lactam-contamination-in-drugs-and-drug-manufacturing-surfaces
#15
Chen Qiu, Hongbin Zhu, Connie Ruzicka, David Keire, Hongping Ye
Penicillins and some non-penicillin β-lactams may cause potentially life-threatening allergic reactions. Thus, possible cross contamination of β-lactams in food or drugs can put people at risk. Therefore, when there is a reasonable possibility that a non-penicillin product could be contaminated by penicillin, the drug products are tested for penicillin contamination. Here, a sensitive and rapid method for simultaneous determination of multiple β-lactam antibiotics using high performance liquid chromatography-tandem mass spectrometry (LC-MS/MS) was developed and validated...
May 15, 2018: AAPS Journal
https://www.readbyqxmd.com/read/29764149/vacuum-ultraviolet-photoionization-cross-section-of-the-hydroxyl-radical
#16
Leah G Dodson, John D Savee, Samer Gozem, Linhan Shen, Anna I Krylov, Craig A Taatjes, David L Osborn, Mitchio Okumura
The absolute photoionization spectrum of the hydroxyl (OH) radical from 12.513 to 14.213 eV was measured by multiplexed photoionization mass spectrometry with time-resolved radical kinetics. Tunable vacuum ultraviolet (VUV) synchrotron radiation was generated at the Advanced Light Source. OH radicals were generated from the reaction of O(1 D) + H2 O in a flow reactor in He at 8 Torr. The initial O(1 D) concentration, where the atom was formed by pulsed laser photolysis of ozone, was determined from the measured depletion of a known concentration of ozone...
May 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29764021/-misdiagnosic-analysis-and-treatment-of-pyriform-sinus-fistula-in-children
#17
J Ma, C Ming, F Lou, M L Wang, K Lin, W J Zeng, Z C Li, X F Liu, T S Zhang
Objective: To discuss the misdiagnosis of pyriform sinus fistula and to better understand this kind of illness. Methods: The analysis was based on twenty-eight patients with congenital pyriform sinus fistula aged from 11 months to 14 years, with the median age of 5 years, and who were surgically treated from January 2013 to January 2017 in Kunming Children's Hospital.Twenty patients were misdiagnosed in other hospital.After the routine examination of neck ultrasound and enhanced CT, internal fistula was found by self-retaining laryngoscope, traced by methylene blue, and excised by high ligation...
May 7, 2018: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
https://www.readbyqxmd.com/read/29763442/platinum-corrosion-products-from-electrode-contacts-of-human-cochlear-implants-induce-cell-death-in-cell-culture-models
#18
Kirsten Wissel, Gudrun Brandes, Nils Pütz, Gian Luigi Angrisani, Jan Thieleke, Thomas Lenarz, Martin Durisin
Despite the technological progress made with cochlear implants (CI), impedances and their diagnosis remain a focus of interest. Increases in impedance have been related to technical defects of the electrode as well as inflammatory and/or fibrosis along the electrode. Recent studies have demonstrated highly increased impedances as the result of corroded platinum (Pt) electrode contacts. This in vitro study examined the effects of Pt ions and compounds generated by corrosion of the electrode contacts of a human CI on cell metabolism...
2018: PloS One
https://www.readbyqxmd.com/read/29761519/evaluation-of-needle-trap-micro-extraction-and-solid-phase-micro-extraction-obtaining-comprehensive-information-on-volatile-emissions-from-in-vitro-cultures
#19
Peter Oertel, Andreas Bergmann, Sina Fischer, Phillip Trefz, Anne Küntzel, Petra Reinhold, Heike Köhler, Jochen K Schubert, Wolfram Miekisch
Volatile organic compounds (VOCs) emitted from in vitro cultures may reveal information on species and metabolism. Due to low nmol L-1 concentration ranges, pre-concentration techniques are required for gas-chromatography mass-spectrometry (GC-MS) based analyses. This study was intended to compare the efficiency of established micro-extraction techniques - solid-phase micro-extraction (SPME) and needle-trap micro-extraction (NTME) - for the analysis of complex VOC patterns. For SPME, a 75 μm Carboxen®/Polydimethylsiloxane fibre was used...
May 14, 2018: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29758887/arsenic-rich-shallow-groundwater-in-sandy-aquifer-systems-buffered-by-rising-carbonate-waters-a-geochemical-case-study-from-mannar-island-sri-lanka
#20
U G C Bandara, Saranga Diyabalanage, Christian Hanke, Robert van Geldern, Johannes A C Barth, Rohana Chandrajith
Major ion, trace elements, and stable isotope analyses were performed on groundwater samples collected from Mannar Island in the northern Indian Ocean. Arsenic concentrations up to 34μg/L have been observed in groundwater samples from the island. In addition, 23% of extensively used shallow drinking water wells showed higher arsenic contents than the recommended value by the World Health Organization (10μg/L). Groundwater in the island showed pH values between 6.9 and 8.9 and was dominated by Na+ , K+ , Ca2+ , Mg2+ , HCO3 - , Cl- and SO4 2- ...
August 15, 2018: Science of the Total Environment
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