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1,559 Newest Publications about the topic spectrometers

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Use of Online Spectroscopy to Control Polymerization in Industrial Processes

20-Jan-2017 | Brenda Colegrove, Kishori Deshpande, Rich Harner, Liane Mikolajczyk, Serena K. Stephenson, J. D. Tate, John Weston, Macromolecular Reaction Engineering, 2017

Online analyzers enable manufacturers to operate modern polymerization processes as safely, reliably, and profitably as possible. The most critical application of this technology involves monitoring the reactor itself to determine the molecular weight and comonomer content of the polymer ...

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Correlated/non-correlated ion dynamics of charge-neutral ion couples: the origin of ionicity in ionic liquids

17-Jan-2017 | G. W. Driver; Y. Huang; A. Laaksonen; T. Sparrman; Y.-L. Wang; P.-O. Westlund, Physical Chemistry Chemical Physics, 2017

Proton/fluoride spin–lattice (T1) nuclear magnetic relaxation dispersion (NMRD) measurements of 1-butyl-3-methyl-1H-imidazolium hexafluorophosphate, [C4mim][PF6], have been carried out using high field spectrometers and a fast-field-cycling instrument at proton Larmor frequencies ranging from 10 ...

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1H qNMR Quantification of Annonaceous Acetogenins in Crude Extracts of Annona muricata L. Fruit Pulp

16-Jan-2017 | Natacha Bonneau, Timothé Cynober, Jean‐Christophe Jullian, Pierre Champy, Phytochemical Analysis, 2017

Abstract Introduction Annonaceous acetogenins (AAGs) constitute a group of environmental neurotoxins, possibly implicated in sporadic atypical Parkinsonism/dementia complexes. The recent evidencing of complex mixtures of AAGs in edible fruits and derived food products requires efficient and ...

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Metabolic phenotyping of human plasma by 1H‐NMR at high and medium magnetic field strengths: a case study for lung cancer

06-Jan-2017 | Louis Evelyne, Francois‐Xavier Cantrelle, Liesbet Mesotten, Gunter Reekmans, Liene Bervoets, Karolien Vanhove, Michi ..., Magnetic Resonance in Chemistry, 2017

Abstract Accurate identification and quantification of human plasma metabolites can be challenging in crowded regions of the NMR spectrum with severe signal overlap. Therefore, this study describes metabolite spiking experiments on the basis of which the NMR spectrum can be rationally ...

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Critical evaluation of spectral information of benchtop vs. portable near-infrared spectrometers: quantum chemistry and two-dimensional correlation spectroscopy for a better understanding of PLS regression models of the rosmarinic acid content in Rosmarini folium

21-Dec-2016 | Christian G. Kirchler; Cornelia K. Pezzei; Krzysztof B. Beć; Sophia Mayr; Mika Ishigaki; Yukihiro Ozaki; Christian W ..., Analyst, 2016

In the present work the performances of one benchtop and two different types of miniaturized near-infrared (NIR)-spectrometers were tested and compared for the first time by the determination of the rosmarinic acid (RA) content of dried and powdered Rosmarini folium. The recorded NIR spectra were ...

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Improving Performance Metrics of Ultraviolet Photodissociation Mass Spectrometry by Selective Precursor Ejection

20-Dec-2016 | Dustin D. Holden; Jennifer S. Brodbelt, Analytical Chemistry, 2016

Confident protein identifications derived from high-throughput bottom-up and top-down proteomics workflows depend on acquisition of thousands of tandem mass spectrometry (MS/MS) spectra with adequate signal-to-noise and accurate mass assignments of the fragment ions. Ultraviolet photodissociation ...

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Correlated/non-correlated ion dynamics of charge-neutral ion couples: the origin of ionicity in ionic liquids

15-Dec-2016 | Per-Olof Westlund; Gordon Driver; Yonglei Wang; Tobias Sparrman; Aatto Laaksonen; Yang Huang, Physical Chemistry Chemical Physics, 2016

Proton/Fluoride spin-lattice ($T_1$) nuclear magnetic relaxation dispersion (NMRD) measurements of 1-butyl-3-methyl-$1H$-imidazolium hexa-fluorophosphate, [$C_4mim][PF_6]$, have been carried out using high field spectrometers and fast-field-cycling instrument at proton Larmor frequencies ranging ...

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Analysis of whole blood by ICP-MS equipped with a high temperature total sample consumption system

14-Dec-2016 | Águeda Cañabate; Esperanza García-Ruiz; Martín Resano; José-Luis Todolí, Journal of Analytical Atomic Spectrometry, 2016

In this work, the performance of a high temperature torch Integrated Sample Introduction System (hTISIS) using inductively coupled plasma mass spectrometry (ICP-MS) for the multi-element analysis of whole blood is evaluated. Two different quadrupole-based spectrometers were tested and the ...

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Analysis of whole blood through ICP-MS equipped with a high temperature total sample consumption system

01-Dec-2016 | Agueda Cañabate; Esperanza García-Ruiz; Martin Resano; Jose-Luis Todoli Torro, Journal of Analytical Atomic Spectrometry, 2016

This work evaluates the performance of a high temperature Torch Integrated Sample Introduction System (hTISIS) in Inductively Coupled Plasma Mass Spectrometry (ICP-MS) for the multielemental analysis of whole blood. Two different quadrupole-based spectrometers were tested and the optimization ...

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Profile of Marius Clore [Profile]

08-Nov-2016 | Christopher Samoray, Proceedings of the National Academy of Sciences current issue, 2016

In a hangar-style space draped in dim blue light stand seven tall, cylindrical machines. The machines, NMR spectrometers, resemble wingless man-made satellites. Most of them rest at floor level, with a sample loading port reached by a small staircase, but a few protrude above the floor. Marius ...

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