Ultrahigh Sensitivity PTR-MS Instrument with a Well-Defined Ion Chemistry. [PDF]
Anal Chem, 2023 Proton-transfer-reaction mass spectrometry (PTR-MS) is widely used for measuring organic trace gases in air. In traditional PTR-MS, both nonpolar and polar analytes are ionized with unit efficiency, as predicted from ion-molecule collision theories. This well-defined ion chemistry allows for direct quantification of analytes without prior calibration ...
Reinecke T +4 more
europepmc +4 more sources
Proton-transfer-reaction mass spectrometry (PTR-MS) for online monitoring of glucose depletion and cell concentrations in HEK 293 gene therapy processes. [PDF]
Biotechnol Lett, 2022 The applicability of proton-transfer-reaction mass spectrometry (PTR-MS) as a versatile online monitoring tool to increase consistency and robustness for recombinant adeno-associated virus (rAAV) producing HEK 293 bioprocesses was evaluated. We present a
Bayer B +8 more
europepmc +2 more sources
Real-Time Monitoring of Volatile Compounds Losses in the Oven during Baking and Toasting of Gluten-Free Bread Doughs: A PTR-MS Evidence. [PDF]
Foods, 2020 Losses of volatile compounds during baking are expected due to their evaporation at the high temperatures of the oven, which can lead to a decrease in the aroma intensity of the final product, which is crucial for gluten-free breads that are known for ...
Pico J +4 more
europepmc +2 more sources
Advances in proton transfer reaction mass spectrometry (PTR-MS): applications in exhaled breath analysis, food science, and atmospheric chemistry. [PDF]
J Breath Res, 2019 This report discusses advances in instrumentation based on soft chemical ionization followed by high-resolution real-time mass spectrometry (HR-MS), specifically in relation to developments in proton transfer reaction mass spectrometry (PTR-MS ...
Pleil JD, Hansel A, Beauchamp J.
europepmc +2 more sources
The peppermint breath test benchmark for PTR-MS and SIFT-MS
Journal of Breath Research, 2021 Abstract A major challenge for breath research is the lack of standardization in sampling and analysis. To address this, a test that utilizes a standardized intervention and a defined study protocol has been proposed to explore disparities in breath research across different analytical platforms and to provide benchmark values for ...
Ben Henderson +17 more
openaire +7 more sources
Effects of Dilution Systems in Olfactometry on the Recovery of Typical Livestock Odorants Determined by PTR-MS. [PDF]
Sensors (Basel), 2017 The present study provides an elaborate assessment of the performance of olfactometers in terms of odorant recovery for a selection of odorants emitted from livestock houses.
Kasper PL +5 more
europepmc +2 more sources
Key Odorants from Pig Production Based on Improved Measurements of Odor Threshold Values Combining Olfactometry and Proton-Transfer-Reaction Mass Spectrometry (PTR-MS). [PDF]
Sensors (Basel), 2018 Analytical measurements of odorants in combination with odor threshold values is an alternative to sensory measurements that can be used to evaluate abatement technologies for pig production facilities.
Hansen MJ +3 more
europepmc +2 more sources
Comparing Proton Transfer Reaction (PTR) and Adduct Ionization Mechanism (AIM) for the Study of Volatile Organic Compounds [PDF]
MoleculesVolatile organic compounds (VOCs) play a central role in plant communication and ecology, acting as a chemical language that mediates interactions with other organisms and responses to environmental stimuli.
Sara Avesani +7 more
doaj +2 more sources
Atmosphere, 2020 Monoterpenes (MTs) represent an important family of biogenic volatile organic compounds (BVOCs) in terms of amount and chemical diversity. This family has been extensively studied using gas chromatography (GC) and proton transfer reaction-mass ...
Sandy Bsaibes +9 more
doaj +2 more sources
Application of PTR-MS for Measuring Odorant Emissions from Soil Application of Manure Slurry [PDF]
Sensors, 2015 Odorous volatile organic compounds (VOC) and hydrogen sulfide (H2S) are emitted together with ammonia (NH3) from manure slurry applied as a fertilizer, but little is known about the composition and temporal variation of the emissions.
Anders Feilberg +2 more
doaj +2 more sources