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1,427 Newest Publications about the topic spectrometers

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Simple Setup for Gas-Phase H/D Exchange Mass Spectrometry Coupled to Electron Transfer Dissociation and Ion Mobility for Analysis of Polypeptide Structure on a Liquid Chromatographic Time Scale

20-11-2014 | Ulrik H. Mistarz; Jeffery M. Brown; Kim F. Haselmann; Kasper D. Rand, Analytical Chemistry, 2014

Gas-phase hydrogen/deuterium exchange (HDX) is a fast and sensitive, yet unharnessed analytical approach for providing information on the structural properties of biomolecules, in a complementary manner to mass analysis. Here, we describe a simple setup for ND3-mediated millisecond gas-phase HDX ...

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Next-Generation Proteomics: Toward Customized Biomarkers for Environmental Biomonitoring

17-11-2014 | Judith Trapp; Jean Armengaud; Arnaud Salvador; Arnaud Chaumot; Olivier Geffard, Environmental Science & Technology, 2014

Because of their ecological representativeness, invertebrates are commonly employed as test organisms in ecotoxicological assessment; however, to date, biomarkers employed for these species were the result of a direct transposition from vertebrates, despite deep evolutionary divergence. To gain ...

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[Perspective] Improving planet-finding spectrometers

14-11-2014 | Justin R. Crepp, Science , 2014

Adaptive optics will enhance the precision of exoplanet surveys Author: Justin R. Crepp

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Evaluation of a Benchtop Cryogen-Free Low-Field 1H NMR Spectrometer for the Analysis of Sexual Enhancement and Weight Loss Dietary Supplements Adulterated with Pharmaceutical Substances

10-11-2014 | Guilhem Pagès; Anna Gerdova; David Williamson; Véronique Gilard; Robert Martino; Myriam Malet-Martino, Analytical Chemistry, 2014

Nuclear magnetic resonance (NMR) spectroscopy is a unique tool for detection, structural characterization, and quantification of compounds in complex mixtures. However, due to cost constraints, NMR is rarely used in routine quality control (QC) analysis. The recent release of benchtop ...

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Automatic standardization method for Raman spectrometers with applications to pharmaceuticals

28-10-2014 | Hui Chen, Zhi‐Min Zhang, Li Miao, De‐Jian Zhan, Yi‐Bao Zheng, Yan Liu, Feng Lu, Yi‐Zeng Liang, Journal of Raman Spectroscopy, 2014

An effective and practical method, based on automatic peak detection, Lorentzian fitting, and polynomial fitting, is developed for aligning spectra, which can significantly reduce or eliminate systematic differences between Raman spectrometers. In this work, Lorentzian fitting of the ...

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Reaction of Limonene with F2: Rate Coefficient and Products

28-10-2014 | Yuri Bedjanian; Manolis N. Romanias; Julien Morin, Journal of Physical Chemistry A, 2014

The kinetics of the reaction of limonene (C10H16) with F2 has been studied using a low pressure (P = 1 Torr) and a high pressure turbulent (P = 100 Torr) flow reactor coupled with an electron impact ionization and chemical ionization mass spectrometers, respectively: F2 + Limonene → products (1). ...

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Unexpected peaks in tandem mass spectra due to reaction of product ions with residual water in mass spectrometer collision cells

23-10-2014 | Pedatsur Neta, Mahnaz Farahani, Yamil Simón‐Manso, Yuxue Liang, Xiaoyu Yang, Stephen E. Stein, Rapid Communications in Mass Spectrometry, 2014

RATIONALE Certain product ions in electrospray ionization tandem mass spectrometry are found to react with residual water in the collision cell. This reaction often leads to the formation of ions that cannot be formed directly from the precursor ions, and this complicates the mass spectra and ...

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Real time monitoring of gases emitted from soils using a multi-turn time-of-flight mass spectrometer “MULTUM-S II”

21-10-2014 | Takahiro Anan; Shuichi Shimma; Yo Toma; Yasuyuki Hashidoko; Ryusuke Hatano; Michisato Toyoda, Journal of Environmental Monitoring, 2014

Many miniaturized mass spectrometers used for on-site analysis have been designed and developed recently utilizing a broad range of analyzer platforms. These instruments are expected to have widespread applications covering many fields of interest. In our laboratory, a miniaturized multi-turn ...

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Characterization and usage of the EASY-spray technology as part of an online 2D SCX-RP ultra-high pressure system

14-10-2014 | Fabio Marino; Alba Cristobal; Nadine Binai; Nicolai Bache; Albert JR Heck; Shabaz Mohammed, Analyst, 2014

Ultra-high pressure liquid chromatography (UHPLC) systems combined with state-of-the-art mass spectrometers have pushed the limit of deep proteome sequencing to new heights making it possible to identify thousands of proteins in a single LC-MS experiment within a few hours. The recently released ...

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Thermal Energy Harvesting Plasmonic Based Chemical Sensors

08-10-2014 | Nicholas Karker; Gnanaprakash Dharmalingam; Michael A. Carpenter, ACS Nano, 2014

Detection of gases such as H2, CO, and NO2 at 500 °C or greater requires materials with thermal stability and reliability. One of the major barriers toward integration of plasmonic-based chemical sensors is the requirement of multiple components such as light sources and spectrometers. In this ...

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