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1,442 Newest Publications about the topic spectrometers

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An online temperature‐controlled vacuum‐equilibration preparation system for the measurement of δ2H values of non‐exchangeable‐H and of δ18O values in organic materials by isotope‐ratio mass spectrometry

28-Jan-2015 | Leonard I. Wassenaar, Keith A. Hobson, Leonardo Sisti, Rapid Communications in Mass Spectrometry, 2015

Rationale Measurement of δ2H values in non‐exchangeable‐H (δ2Hn) and δ18O values in organic environmental samples are inconsistent among laboratories worldwide due to varied and lengthy approaches in controlling for H isotope exchange (for δ2Hn values) and removal of trace moisture (δ2Hn and ...

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In crystallo optical spectroscopy (icOS) as a complementary tool on the macromolecular crystallography beamlines of the ESRF

23-Jan-2015 | David von Stetten, Thierry Giraud, Philippe Carpentier, Franc Sever, Maxime Terrien, Fabien Dobias, Douglas H. Juers ..., Acta Crystallographica Section D, 2015

The analysis of structural data obtained by X‐ray crystallography benefits from information obtained from complementary techniques, especially as applied to the crystals themselves. As a consequence, optical spectroscopies in structural biology have become instrumental in assessing the relevance ...

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Negative electrospray ionization mass spectrometry: a method for sequencing and determining linkage position in oligosaccharides from branched hemicelluloses

19-Jan-2015 | Bernard Quéméner, Jacqueline Vigouroux, Estelle Rathahao, Jean Claude Tabet, Aleksandra Dimitrijevic, Marc Lahaye, Journal of Mass Spectrometry, 2015

Xyloglucans of apple, tomato, bilberry and tamarind were hydrolyzed by commercial endo β‐1‐4‐D‐endoglucanase. The xylo‐gluco‐oligosaccharides (XylGos) released were separated on CarboPac PA 200 column in less than 15 min, and, after purification, they were structurally characterized by negative ...

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Portable FTIR analyzers for the rapid determination of total trans fat

15-Jan-2015 | Magdi M. Mossoba, Cynthia T. Srigley, John K.G. Kramer, Lipid Technology, 2015

Mid‐infrared spectroscopy (MIS) has been a particularly valuable, rapid analytical tool because it provides the total trans fat content of lipids in a single measurement. In recent years, portable Fourier transform infrared (FTIR) analyzers, which are most useful for field laboratories, have ...

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Photolytic determination of charge state for large proteins and fragments in an ion trap mass spectrometer

13-Jan-2015 | Yana A. Lyon, Ryan R. Julian, Rapid Communications in Mass Spectrometry, 2015

Rationale One of the major shortcomings of linear ion trap mass spectrometers is poor resolution. Failure to resolve isotopic peaks makes charge state determination for large proteins very difficult, hindering the ability to perform top‐down proteomics. Methods Peptides, proteins and ...

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Method development for the determination of chromium and thallium in fertilizer samples using graphite furnace atomic absorption spectrometry and direct solid sample analysis

04-Jan-2015 | Author(s): Aline R. Borges , Luciane L. François , Emilene M. Becker , Maria Goreti R. Vale , Bernhard Welz, Microchemical Journal, 2015

Publication date: March 2015 Source:Microchemical Journal, Volume 119 Author(s): Aline R. Borges , Luciane L. François , Emilene M. Becker , Maria Goreti R. Vale , Bernhard Welz A method has been developed for the determination of chromium and thallium in fertilizer samples using line ...

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Raman spectroscopic characterization of laminated glass and transparent sheet plastics to amplify a history of early aviation ‘glass’

27-Dec-2014 | Odile Madden, Kim Cullen Cobb, Alex M. Spencer, Journal of Raman Spectroscopy, 2014

A novel, non‐invasive study of goggles, flight helmets, airplane windows, and canopies in Smithsonian collections is the first known large‐scale technical survey of historic aviation plastics and leverages the world's largest air and space collection as evidence of the materials and technologies ...

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Fast Infrared Chemical Imaging with a Quantum Cascade Laser

22-Dec-2014 | Kevin Yeh; Seth Kenkel; Jui-Nung Liu; Rohit Bhargava, Analytical Chemistry, 2014

Infrared (IR) spectroscopic imaging systems are a powerful tool for visualizing molecular microstructure of a sample without the need for dyes or stains. Table-top Fourier transform infrared (FT-IR) imaging spectrometers, the current established technology, can record broadband spectral data ...

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Polymer Micronozzle Array for Multiple Electrosprays Produced by Templated Synthesis and Etching of Microstructured Fibers

18-Dec-2014 | Yueqiao Fu; Graham T. T. Gibson; Antoine Proulx; André Croteau; Bradley B. Schneider; Thomas R. Covey; Richard D. Ol ..., Analytical Chemistry, 2014

Microstructured fibers (MSFs) having raised polymer nozzles in each channel are custom designed, fabricated, and tested for use as multiple electrospray (MES) emitters for mass spectrometry (MS). There is strong motivation to develop electrospray emitters that operate at practical flow rates but ...

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Development of an ion activation stage for atmospheric pressure ionization sources

15-Dec-2014 | Sonja Klee, Albrecht Brockhaus, Walter Wißdorf, Marco Thinius, Nele Hartmann, Thorsten Benter, Rapid Communications in Mass Spectrometry, 2014

RATIONALE The ion‐molecule chemistry in typical atmospheric pressure ion sources is essentially thermodynamically controlled. Methods relying on gas‐phase protonation reactions, e.g. atmospheric pressure chemical ionization (APCI), thus suffer from the low reactivity of the equilibrated ...

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