keyword
MENU ▼
Read by QxMD icon Read
search

Ambient ionization

keyword
https://www.readbyqxmd.com/read/28319370/uptake-and-disposition-of-select-pharmaceuticals-by-bluegill-exposed-at-constant-concentrations-in-a-flow-through-aquatic-exposure-system
#1
Jian-Liang Zhao, Edward T Furlong, Heiko L Schoenfuss, Dana Ward Kolpin, Kyle L Bird, David J Feifarek, Eric A Schwab, Guang-Guo Ying
The increasing use of pharmaceuticals has led to their subsequent input into and release from wastewater treatment plants, with corresponding discharge into surface waters that may subsequently exert adverse effects upon aquatic organisms. Although the distribution of pharmaceuticals in surface water has been extensively studied, the details of uptake, internal distribution, and kinetic processing of pharmaceuticals in exposed fish have received less attention. For this research, we investigated the uptake, disposition, and toxicokinetics of five pharmaceuticals (diclofenac, methocarbamol, rosuvastatin, sulfamethoxazole, and temazepam) in bluegill sunfish (Lepomis macrochirus) exposed to environmentally relevant concentrations (1,000-4,000 ng L-1) in a flow-through exposure system...
March 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28318234/light-absorbing-brown-carbon-aerosol-constituents-from-combustion-of-indonesian-peat-and-biomass
#2
Sri Hapsari Budisulistiorini, Matthieu Riva, Michael Williams, Jing Chen, Masayuki Itoh, Jason Douglas Surratt, Mikinori Kuwata
Light-absorbing brown carbon (BrC) constituents of organic aerosol (OA) have been shown to significantly absorb ultra-violet (UV) and visible light, and thus, impact radiative forcing. However, molecular identification of the BrC constituents is still limited. In this study, we characterize BrC constituents at the molecular level in: i) aerosols emitted by combustion of peat, fern/leaf, and charcoal from Indonesia and ii) ambient aerosols collected in Singapore during the 2015 haze episode. Aerosols were analyzed using ultra-performance liquid chromatography interfaced to a diode array detector and electrospray ionization high-resolution quadrupole time-of-flight mass spectrometer (UPLC/DAD-(-)ESI-HR-QTOFMS) operated in the negative ion mode...
March 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28286302/recent-advances-in-the-detection-of-specific-natural-organic-compounds-as-carriers-for-radionuclides-in-soil-and-water-environments-with-examples-of-radioiodine-and-plutonium
#3
REVIEW
P H Santschi, C Xu, S Zhang, K A Schwehr, P Lin, C M Yeager, D I Kaplan
Among the key environmental factors influencing the fate and transport of radionuclides in the environment is natural organic matter (NOM). While this has been known for decades, there still remains great uncertainty in predicting NOM-radionuclide interactions because of lack of understanding of radionuclide interactions with the specific organic moieties within NOM. Furthermore, radionuclide-NOM studies conducted using modelled organic compounds or elevated radionuclide concentrations provide compromised information related to true environmental conditions...
March 9, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28274593/in-depth-compositional-analysis-of-water-soluble-and-insoluble-organic-substances-in-fine-pm2-5-airborne-particles-using-ultra-high-resolution-15t-ft-icr-ms-and-gc%C3%A3-gc-tofms
#4
Jung Hoon Choi, Jijeong Ryu, Sodam Jeon, Jungju Seo, Yung-Hun Yang, Seung Pil Pack, Sungwook Choung, Kyoung-Soon Jang
Airborne particulate matter consisting of ionic species, salts, heavy metals and carbonaceous material is one of the most serious environmental pollutants owing to its impacts on the environment and human health. Although elemental and organic carbon compounds are known to be major components of aerosols, information on the elemental composition of particulate matter remains limited because of the broad range of compounds involved and the limits of analytical instruments. In this study, we investigated water-soluble and -insoluble organic compounds in fine (PM2...
March 5, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28271681/the-evaluation-of-colorectal-cancer-risk-in-serum-by-anti-desmin-conjugated-cdte-cds-quantum-dots
#5
Yao Wang, Yuanting Li, Zhiyong Chen, Tianhao Wang, Jie Gu, Xianhua Wu, Yi Yin, Maosheng Wang, Zhigang Pan
BACKGROUND: DESMIN is a novel prognostic predictor and therapeutic target for colorectal cancer (CRC). Enzyme-linked immunosorbent assay (ELISA) and electrochemiluminescence (ELC) assays are large-scale and highcost projects; therefore, it is necessary to develop a new, fast, and simple yet highly sensitive and specific method to detect DESMIN in serum. Semiconducting quantum dots (QDs) possess high fluorescence quantum yield, stability against photobleaching, and size-controlled luminescence properties, thus being utilized in photoelectrochemical tumor marker detection, especially in ameliorating the diagnostic value in complex biological ambient ionization...
March 1, 2017: Clinical Laboratory
https://www.readbyqxmd.com/read/28263006/rapid-analysis-of-forensic-related-samples-using-two-ambient-ionization-techniques-coupled-to-high-resolution-mass-spectrometers
#6
Eshwar Jagerdeo, Amanda Wriston
RATIONALE: This paper highlights the versatility of interfacing two ambient ionization techniques, Laser Diode Thermal Desorption (LDTD) and Atmospheric Solids Analysis probe (ASAP), to high resolution mass spectrometers and demonstrate the method's capability to rapidly generate high-quality data from multiple sample types with minimal, if any sample preparation. METHODS: For ASAP-MS analysis of solid and liquid samples, the material was transferred to a capillary surface before being introduced into the mass spectrometer...
March 6, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28253619/determination-of-peroxide-explosive-tatp-and-related-compounds-by-dielectric-barrier-discharge-ionization-mass-spectrometry-dbdi-ms
#7
Sebastian Hagenhoff, Joachim Franzke, Heiko Hayen
Dielectric barrier discharge ionization-mass spectrometry (DBDI-MS), which is based on the use of a low temperature helium plasma as ionization source, is used for the determination of trace amounts of triacetone triperoxide (TATP) and its homologue diacetone diperoxide (DADP) from surfaces. TATP is observed as [M+NH4](+) adduct, whereas DADP is observed as [M+O+NH4](+). Measurement of DADP with varying deuteration degrees (DADP, DADP-d6 and DADP-d12) indicates that DADP undergoes oxidation when ionized by DBDI...
March 3, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28252942/ambient-characterization-of-synthetic-fibers-by-laser-ablation-electrospray-ionization-mass-spectrometry
#8
Fred A M G van Geenen, Maurice C R Franssen, Anton H M Schotman, Han Zuilhof, Michel W F Nielen
Direct analysis of synthetic fibers under ambient conditions is highly desired to identify the polymer, the finishes applied and irregularities that may compromise its performance and value. In this paper, laser ablation electrospray ionization ion mobility time-of-flight mass spectrometry (LAESI-IMS-TOF-MS) was used for the analysis of synthetic polymers and fibers. The key to this analysis was the absorption of laser light by aliphatic and aromatic nitrogen functionalities in the polymers. Analysis of polyamide (PA) 6, 46, 66, and 12 pellets and PA 6, 66, polyaramid and M5 fibers yielded characteristic fragment ions without any sample pretreatment, enabling their unambiguous identification...
March 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28252284/mini-mass-spectrometer-integrated-with-a-miniature-ion-funnel
#9
Yanbing Zhai, Xiaohua Zhang, Hualei Xu, Yongchang Zheng, Tao Yuan, Wei Xu
Previously, a continuous atmospheric pressure interfaced miniature mass spectrometer was developed in our lab. The continuous atmospheric pressure interface improves system robustness, stability, and scan speed, but it also results in limited ion transfer efficiency and reduced mass resolution. To solve these problems, a miniature ion funnel was designed and integrated into the miniature mass spectrometer for the first time. Besides ion transfer efficiency, dimension and power consumption of the ion funnel also need to be considered throughout the design process...
March 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28247296/detection-of-metastatic-breast-and-thyroid-cancer-in-lymph-nodes-by-desorption-electrospray-ionization-mass-spectrometry-imaging
#10
Jialing Zhang, Clara L Feider, Chandandeep Nagi, Wendong Yu, Stacey A Carter, James Suliburk, Hop S Tran Cao, Livia S Eberlin
Ambient ionization mass spectrometry has been widely applied to image lipids and metabolites in primary cancer tissues with the purpose of detecting and understanding metabolic changes associated with cancer development and progression. Here, we report the use of desorption electrospray ionization mass spectrometry (DESI-MS) to image metastatic breast and thyroid cancer in human lymph node tissues. Our results show clear alterations in lipid and metabolite distributions detected in the mass spectra profiles from 42 samples of metastatic thyroid tumors, metastatic breast tumors, and normal lymph node tissues...
February 28, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28228019/equation-of-state-and-shock-compression-of-warm-dense-sodium-a-first-principles-study
#11
Shuai Zhang, Kevin P Driver, François Soubiran, Burkhard Militzer
As one of the simple alkali metals, sodium has been of fundamental interest for shock physics experiments, but knowledge of its equation of state (EOS) in hot, dense regimes is not well known. By combining path integral Monte Carlo (PIMC) results for partially ionized states [B. Militzer and K. P. Driver, Phys. Rev. Lett. 115, 176403 (2015)] at high temperatures and density functional theory molecular dynamics (DFT-MD) results at lower temperatures, we have constructed a coherent equation of state for sodium over a wide density-temperature range of 1...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28221028/characterization-of-an-airborne-laser-spark-ion-source-for-ambient-mass-spectrometry
#12
Andreas Bierstedt, Hendrik Kersten, Reto Glaus, Igor Gornushkin, Ulrich Panne, Jens Riedel
An airborne laser plasma is suggested as an ambient ion source for mass spectrometry. Its fundamental physical properties, such as an excellent spatial and temporal definition, high electron and ion densities and a high effective cross section in maintaining the plasma, make it a promising candidate for future applications. For deeper insights into the plasma properties, the optical plasma emission is examined and compared to mass spectra. The results show a seemingly contradictory behavior, since the emitted light reports the plasma to almost entirely consist of hot elemental ions, while the corresponding mass spectra exhibit the formation of intact molecular species...
March 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28208290/biochip-spray-simplified-coupling-of-surface-plasmon-resonance-biosensing-and-mass-spectrometry
#13
Sweccha Joshi, Han Zuilhof, Teris A van Beek, Michel W F Nielen
A simplified coupling of surface plasmon resonance (SPR) immuno-biosensing with ambient ionization mass spectrometry (MS) was developed. It combines two orthogonal analysis techniques: the biosensing capability of SPR and the chemical identification power of high resolution MS. As a proof-of-principle, deoxynivalenol (DON), an important mycotoxin, was captured using an SPR gold chip containing an antifouling layer and monoclonal antibodies against the toxin and, after washing, the chip could be taken out and analyzed by direct spray MS of the biosensor chip to confirm the identity of DON...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28192980/ambient-pressure-inverse-ion-mobility-spectrometry-coupled-to-mass-spectrometry
#14
Wenjie Liu, Austen L Davis, William F Siems, Dulin Yin, Brian H Clowers, Herbert H Hill
Although higher resolving powers are often achieved using ambient pressure drift tube ion mobility mass spectrometry (DT-IMMS) systems, lower duty cycles are often required which directly impacts sensitivity. Moreover, the mechanism of ion gating using Bradbury-Nielsen or Tyndall-Gate configurations routinely results in ion gate depletion effects which discriminate against low mobility ions. This paper reports a new method of ambient pressure ion mobility operation in which inverse ion mobility spectrometry is coupled to a time-of-flight mass spectrometer to improve sensitivity and minimize the effects of ion gate depletion...
February 16, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28144898/ambient-ionization-mass-spectrometry-measurement-of-aminotransferase-activity
#15
Xin Yan, Xin Li, Chengsen Zhang, Yang Xu, R Graham Cooks
A change in enzyme activity has been used as a clinical biomarker for diagnosis and is useful in evaluating patient prognosis. Current laboratory measurements of enzyme activity involve multi-step derivatization of the reaction products followed by quantitative analysis of these derivatives. This study simplified the reaction systems by using only the target enzymatic reaction and directly detecting its product. A protocol using paper spray mass spectrometry for identifying and quantifying the reaction product has been developed...
January 31, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28118562/rapid-measurement-of-food-adulteration-with-minimal-sample-preparation-and-no-chromatography-using-ambient-ionization-mass-spectrometry
#16
Avinash Dalmia
A rapid method, with minimalsample preparation and nochromatography, was developedfor analyzing food samples suchasolive oil and pomegranatejuice to measure adulterationwith cheaper ingredientsusing the novel Direct SampleAnalysis<sup>™</sup> (DSA) ion source inconjunction with a time-of-flight(TOF)-MS. In less than 30 s, withminimal sample preparationand method development,adulteration of olive oil andpomegranate juice with cheaperseed oils and fruit juices,respectively, was measured withDSA/TOF-MS...
December 15, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/28116361/ambient-aging-of-rhenium-filaments-used-in-thermal-ionization-mass-spectrometry-growth-of-oxo-rhenium-crystallites-and-anti-aging-strategies
#17
Joseph M Mannion, Matthew S Wellons, Charles R Shick, Glenn A Fugate, Brian A Powell, Scott M Husson
Degassing is a common preparation technique for rhenium filaments used for thermal ionization mass spectrometric analysis of actinides, including plutonium. Although optimization studies regarding degassing conditions have been reported, little work has been done to characterize filament aging after degassing. In this study, the effects of filament aging after degassing were explored to determine a "shelf-life" for degassed rhenium filaments, and methods to limit filament aging were investigated. Zone-refined rhenium filaments were degassed by resistance heating under high vacuum before exposure to ambient atmosphere for up to 2 months...
January 2017: Heliyon
https://www.readbyqxmd.com/read/28110652/ambient-mass-spectrometry-in-cancer-research
#18
Z Takats, N Strittmatter, J S McKenzie
Ambient ionization mass spectrometry was developed as a sample preparation-free alternative to traditional MS-based workflows. Desorption electrospray ionization (DESI)-MS methods were demonstrated to allow the direct analysis of a broad range of samples including unaltered biological tissue specimens. In contrast to this advantageous feature, nowadays DESI-MS is almost exclusively used for sample preparation intensive mass spectrometric imaging (MSI) in the area of cancer research. As an alternative to MALDI, DESI-MSI offers matrix deposition-free experiment with improved signal in the lower (<500m/z) range...
2017: Advances in Cancer Research
https://www.readbyqxmd.com/read/28107617/fabrication-of-nanostructured-mesoporous-germanium-for-application-in-laser-desorption-ionization-mass-spectrometry
#19
Hazem H Abdelmaksoud, Taryn M Guinan, Nicolas H Voelcker
Surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS) is a high-throughput analytical technique ideally suited for small-molecule detection from different bodily fluids (e.g., saliva, urine, and blood plasma). Many SALDI-MS substrates require complex fabrication processes and further surface modifications. Furthermore, some substrates show instability upon exposure to ambient conditions and need to be kept under special inert conditions. We have successfully optimized mesoporous germanium (meso-pGe) using bipolar electrochemical etching and efficiently applied meso-pGe as a SALDI-MS substrate for the detection of illicit drugs such as in the context of workplace, roadside, and antiaddictive drug compliance...
February 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28099012/aqueous-photochemistry-of-secondary-organic-aerosol-of-%C3%AE-pinene-and-%C3%AE-humulene-oxidized-with-ozone-hydroxyl-radical-and-nitrate-radical
#20
Dian E Romonosky, Ying Li, Manabu Shiraiwa, Alexander Laskin, Julia Laskin, Sergey A Nizkorodov
Formation of secondary organic aerosols (SOA) from biogenic volatile organic compounds (BVOC) occurs via O3- and OH-initiated reactions during the day and reactions with NO3 during the night. We explored the effect of these three oxidation conditions on the molecular composition and aqueous photochemistry of model SOA prepared from two common BVOC. A common monoterpene, α-pinene, and sesquiterpene, α-humulene, were used to form SOA in a smog chamber via BVOC + O3, BVOC + NO3, and BVOC + OH + NOx oxidation...
February 6, 2017: Journal of Physical Chemistry. A
keyword
keyword
45837
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"