Showing papers by "Tilmann D. Märk published in 2016"
TL;DR: High mass resolution achieved by ToF mass analyser provided determination of sum formula and tentative identifications of the mass peaks and showed successful separation of the black and green teas based on their headspace volatile emissions both from the dry tea leaves and their infusions.
43 citations
TL;DR: Proton transfer reaction-time of flight-mass spectrometry, PTR-ToF-MS, coupled to chemometrics is presented as a successful tool in the classification of monofloral honeys, which should serve in fraud protection against mispresentation of the floral origin of honey.
25 citations
TL;DR: This study applies proton transfer reaction time-of-flight mass spectrometry for the rapid analysis of volatile compounds released from single Coffeea arabica beans from different geographical origins via offline profiling at different stages of roasting.
Abstract: This study applies proton transfer reaction time-of-flight mass spectrometry for the rapid analysis of volatile compounds released from single coffee beans. The headspace volatile profiles of single coffee beans (Coffeea arabica) from different geographical origins (Brazil, Guatemala and Ethiopia) were analyzed via offline profiling at different stages of roasting. The effect of coffee geographical origin was reflected on volatile compound formation that was supported by one-way ANOVA. Clear origin signatures were observed in the formation of different coffee odorants. Copyright © 2016 John Wiley & Sons, Ltd.
18 citations
TL;DR: It is demonstrated that the novel setup enables fast, high time resolution e‐cigarettes studies with online quantification and enables the analysis and understanding of any puff‐by‐puff variations in e‐cigarette aerosols.
Abstract: Rationale
Due to the recent rapid increase in electronic cigarette (e-cigarette) use worldwide, there is a strong scientific but also practical interest in analyzing e-cigarette aerosols. Most studies to date have used standardized but time-consuming offline technologies. Here a proof-of-concept for a fast online quantification setup based on proton transfer reaction mass spectrometry (PTR-MS) is presented.
Methods
The combination of a novel sampling interface with a time-of-flight PTR-MS instrument specially designed for three scenarios is introduced: (i) mainstream aerosol analysis (aerosol that the user inhales prior to exhalation), and analysis of exhaled breath following (ii) mouth-hold (no inhalation) and (iii) inhalation of e-cigarette aerosols. A double-stage dilution setup allows the various concentration ranges in these scenarios to be accessed.
Results
First, the instrument is calibrated for the three principal constituents of the e-cigarettes' liquids, namely propylene glycol, vegetable glycerol and nicotine. With the double-stage dilution the instrument's dynamic range was easily adapted to cover the concentration ranges obtained in the three scenarios: 20–1100 ppmv for the mainstream aerosol characterisation; 4–300 ppmv for the mouth-hold; and 2 ppbv to 20 ppmv for the inhalation experiment.
Conclusions
It is demonstrated that the novel setup enables fast, high time resolution e-cigarette studies with online quantification. This enables the analysis and understanding of any puff-by-puff variations in e-cigarette aerosols. Large-scale studies involving a high number of volunteers will benefit from considerably higher sample throughput and shorter data processing times. © 2016 The Authors. Rapid Communications in Mass Spectrometry Published by John Wiley & Sons Ltd.
15 citations
TL;DR: In this article, an alternative technique for the measurement of mass transfer coefficients for bubble columns from the gas phase with the mass spectrometric technique of Proton Transfer Reaction-Mass Spectrometry (PTR-MS) is presented.
3 citations