Results 211 to 220 of about 27,664 (259)

Proton-Transfer-Reaction–Mass Spectrometry

2019
The mission of the agro-food industry is to guarantee food safety and, at the same time, improve perceived food quality and fulfill consumer expectations. One of the chief quality traits for the agro-food industry is the development of volatile organic compounds (VOCs), associated with the shelf life and taste quality of food products.
Khomenko, I., Farneti, B.
openaire   +2 more sources

Real-time metabolic monitoring with proton transfer reaction mass spectrometry

Journal of Breath Research, 2013
We analysed the time evolution of several volatile organic compounds formed by the catabolism of ingested isotope-labelled ethanol using real-time breath gas analysis with proton-transfer-reaction mass spectrometry. Isotope labelling allowed distinguishing the emerging volatile metabolites from their naturally occurring, highly abundant counterparts in
Klaus, Winkler, Jens, Herbig, Ingrid, Kohl   +2 more
openaire   +2 more sources

Coupling Proton Transfer Reaction−Mass Spectrometry with Linear Discriminant Analysis:  a Case Study

Journal of Agricultural and Food Chemistry, 2003
Proton transfer reaction-mass spectrometry (PTR-MS) measurements on single intact strawberry fruits were combined with an appropriate data analysis based on compression of spectrometric data followed by class modeling. In a first experiment 8 of 9 different strawberry varieties measured on the third to fourth day after harvest could be successfully ...
Biasioli, Franco, Gasperi, Flavia, Aprea, Eugenio, Mott, Daniela, Boscaini, E., Mayr, D., Märk, T. D.   +6 more
openaire   +4 more sources

Quantification of passive smoking using proton-transfer-reaction mass spectrometry

International Journal of Mass Spectrometry, 1998
Abstract Using acetonitrile as the lead component, quantitative comparison between passive smoking and direct smoking was achieved by performing measurements using proton-transfer-reaction mass spectrometry. Staying for a working day (8 h) in a smoke laden environment, as is typical for pubs where guests are smoking heavily, is equivalent to smoking ...
Prazeller, P, Karl, T, Jordan, A, Holzinger, R, Hansel, A, Lindinger, W   +5 more
openaire   +2 more sources

Characterization of an olfactometer by proton-transfer-reaction mass spectrometry

Measurement Science and Technology, 2010
The performance of a commercial olfactometer instrument, which produces odorant pulses of defined duration and concentration, was characterized using proton-transfer-reaction mass spectrometry (PTR-MS). Direct coupling of the PTR-MS instrument with the olfactometer enabled on-line evaluation of the rapidly delivered aroma pulses. Tests were made with a
J Beauchamp, J Frasnelli, A Buettner, M Scheibe, A Hansel, T Hummel   +5 more
openaire   +2 more sources

Proton transfer reaction-mass spectrometry: fundamentals, recent advances and applications

The European Physical Journal Applied Physics, 2013
Proton transfer reaction-mass spectrometry (PTR-MS) offers many advantages for trace gas analysis, including no sample preparation, real-time analysis, high selectivity and sensitivity, ultra-low detection limits and very short response times. These characteristic features have made it an ideal tool for many applications in science, technology and ...
Eugen Hartungen, Simone Jürschik, Alfons Jordan, Achim Edtbauer, Stefan Feil, Gernot Hanel, Hans Seehauser, Stefan Haidacher, Ralf Schottkowsky, Lukas Märk, Stefan Jaksch, Bishu Agarwal, Kurt Becker, Chris A. Mayhew, Philipp Sulzer, Tilmann D. Märk   +15 more
openaire   +1 more source

Differentiation of specialty coffees by proton transfer reaction-mass spectrometry

Food Research International, 2013
In the coffee sector a diversity of certifications is available, with the most well-known being organic and fair trade. Intrinsic markers of products may help to assure the authenticity of food products and complement administrative controls. In the present study 110 market coffees with special production traits were characterized by high sensitivity ...
Özdestan, Ö., van Ruth, S.M., Alewijn, M., Koot, A.H., Romano, A., Cappelin, L., Biasioli, F.   +6 more
openaire   +3 more sources

Proton transfer reaction mass spectrometry at high drift tube pressure

International Journal of Mass Spectrometry, 2003
Abstract An ion drift tube operated at a total pressure of 10 Torr (∼13 mbar) coupled to a mass spectrometer is described. Proton transfer from water molecules was used to detect organic compounds and calibrations of the instrument yield normalized sensitivities that are in accord with what is expected for operation at this pressure. For example, the
D.R Hanson, J Greenberg, B.E Henry, E Kosciuch   +3 more
openaire   +1 more source

Proton transfer reaction mass spectrometry investigations of phthalate esters via direct headspace sampling

International Journal of Mass Spectrometry, 2021
One of the most common environmentally relevant groups of pollutants are phthalate esters. After decades of industrial use, they have become ubiquitous in the environment and analytical methods to chemically detect them in trace amounts are required. In this study, details of Proton Transfer Reaction-Mass Spectrometry (PTR-MS) investigations for the ...
David Olivenza-León, Chris A. Mayhew, Ramón González-Méndez   +2 more
openaire   +1 more source

Control of solvent use in medical devices by proton transfer reaction mass spectrometry and ion molecule reaction mass spectrometry

Journal of Pharmaceutical and Biomedical Analysis, 2009
A homemade proton transfer reaction mass spectrometer (PTR-MS) and a commercial ion molecule reaction mass spectrometer (IMR-MS) have been applied to detect volatile organic compounds (VOCs) in the packaging bags of infusion sets made of polyvinylchloride (PVC) plastic.
Yujie, Wang, Haiyan, Han, Chengyin, Shen, Jianquan, Li, Hongmei, Wang, Yannan, Chu   +5 more
openaire   +2 more sources