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Franco Biasioli - One of the best experts on this subject based on the ideXlab platform.

  • Mead fermentation monitoring by proton Transfer Reaction mass spectrometry and medium infrared probe
    European Food Research and Technology, 2016
    Co-Authors: Martha Cecilia Quicazán De Cuenca, Andrea Romano, Flavio Ciesa, Peter Robatscher, Matteo Scampicchio, Franco Biasioli
    Abstract:

    Mead is a traditional alcoholic beverage similar to wine, but obtained by the fermentation of a diluted solution of honey. The rate of fermentation is generally monitored by the measurement of a set of physicochemical variables such as pH, titratable acidity, Brix degrees, sugars and ethanol concentration. This work aims at developing a new monitoring method for alcoholic fermentations that is based on two on-line approaches: a proton Transfer Reaction mass spectrometry (PTR-MS) and a fibre optic coupled attenuated total reflection (FTIR-ATR) spectroscopy. Microfermentations are performed on 100 mL musts in isothermal conditions at 20 °C. Musts consist on diluted honey solutions (24 Bx) with pollen (0.4 % w/v) and yeast (Saccharomyces cerevisiae subsp. bayanus). The effect of flavour enhancers [chilli (Capsicum annuum), clove (Eugenia caryophyllata) and a mixture of both] on the rate of fermentation was also evaluated. The results show that clove inhibits fermentation, whereas chilli increases the rate of fermentation. PTR-MS and FTIR-ATR are simple, fast and nondestructive techniques able to monitor the fermentation process without the need of sample preparation, extraction or pre-concentration steps.

  • The Application of Proton Transfer Reaction Mass Spectrometry to the Analysis of Foods
    Reference Module in Food Science, 2016
    Co-Authors: Brian Farneti, Sine Yener, Iuliia Khomenko, Luca Cappellin, Franco Biasioli
    Abstract:

    The instrumental characterization of volatile organic compounds (VOCs) is essential to have a precise, reliable, and reproducible estimation of food aroma and, therefore, of the overall product quality. In this article we will list the main characteristics of PTR-MS (proton Transfer Reaction mass spectrometry) and its application in the agri-food chain research. The high time resolution brought by this technology allows real-time monitoring of fast food processes and rapid and noninvasive VOC fingerprinting.

  • Proton Transfer Reaction–mass spectrometry: online and rapid determination of volatile organic compounds of microbial origin
    Applied Microbiology and Biotechnology, 2015
    Co-Authors: Andrea Romano, Vittorio Capozzi, Giuseppe Spano, Franco Biasioli
    Abstract:

    Analytical tools for the identification and quantification of volatile organic compounds (VOCs) produced by microbial cultures have countless applications in an industrial and research context which are still not fully exploited. The various techniques for VOC analysis generally arise from the application of different scientific and technological philosophies, favoring either sample throughput or chemical information. Proton Transfer Reaction–mass spectrometry (PTR-MS) represents a valid compromise between the two aforementioned approaches, providing rapid and direct measurements along with highly informative analytical output. The present paper reviews the main applications of PTR-MS in the microbiological field, comprising food, environmental, and medical applications.

  • Differentiation of specialty coffees by proton Transfer Reaction-mass spectrometry
    Food Research International, 2013
    Co-Authors: Özgül Özdestan, Andrea Romano, Luca Cappellin, Saskia M. Van Ruth, Martin Alewijn, Alex Koot, Franco Biasioli
    Abstract:

    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 proton Transfer Reaction mass spectrometry (HS PTR-MS) and volatiles were tentatively identified by PTR-time of flight MS. Espresso coffees, Kopi Luwak coffee and organic coffees could be distinguished by their profiles of volatile compounds with the help of chemometrics. A PLS-DA classification model was estimated to classify the organic and regular coffees by their HS PTR-MS mass spectra. Cross validation showed correct prediction of 42 out of the 43 (98%) organic coffee samples and 63 out of the 67 (95%) regular coffee samples. Therefore, the presented strategy is a promising approach to rapid organic coffee authentication.

  • Assessment of Trentingrana cheese ageing by proton Transfer Reaction-mass spectrometry and chemometrics
    International Dairy Journal, 2007
    Co-Authors: Eugenio Aprea, Franco Biasioli, Flavia Gasperi, D. Mott, Federico Marini, Tilmann D. Märk
    Abstract:

    Proton Transfer Reaction-mass spectrometry (PTR-MS) data have been analysed by chemometric techniques to monitor cheese ageing by means of on-line direct head-space gas analysis. Twenty cheese loaves of Trentingrana, a trademarked cheese produced in northern Italy, of different origin and ripening degree, were sampled over the whole Trentingrana production area. An increase of the spectral intensity with ripening has been observed for most of the PTR-MS peaks and a univariate analysis identified 16 mass peaks that were significantly different for ripened and young cheeses, respectively. Moreover, the usefulness of different discriminant analyses and class modelling techniques have been investigated. Discriminant Partial Least Squares analysis, while indicating average behaviour and possible outliers, was not able to correctly classify all samples. Soft class modelling performed better and allowed a 100% correct classification. Partial least square calibration predicted the ageing time of each loaf with reasonable accuracy with a maximum cross-validation error of 3.5 months.

Werner Lindinger - One of the best experts on this subject based on the ideXlab platform.

  • Membrane introduction proton-Transfer Reaction mass spectrometry
    International Journal of Mass Spectrometry, 2002
    Co-Authors: Michael L. Alexander, Werner Lindinger, E. Boscaini, Tilmann D. Märk
    Abstract:

    Abstract The combination of membrane introduction mass spectrometry (MIMS) and proton-Transfer Reaction mass spectrometry (PTR-MS) is explored. The PTR-MS is used to measure properties of a well-characterized membrane material, poly-dimethylsiloxane (PDMS). It is found that the ability of the PTR-MS to measure absolute concentrations in real-time makes it an ideal tool for the characterization of membrane properties and the interaction of the membrane with multiple organic species. Values for the diffusion coefficients of several molecules are measured and found to be in agreement with literature values. Time modulation of the analyte across the membrane is explored as a method of resolving isobaric interferences for different chemical species. This is demonstrated for acetone and propanal. Finally, the benefit of combining MIMS with PTR-MS is demonstrated by the direct analysis of organic species in the headspace of a hot water solution where the high humidity would not allow analysis using the PTR-MS alone.

  • Dynamic measurements of partition coefficients using proton-Transfer-Reaction mass spectrometry (PTR–MS)
    International Journal of Mass Spectrometry, 2002
    Co-Authors: Thomas Karl, Chahan Yeretzian, Alfons Jordan, Werner Lindinger
    Abstract:

    Abstract Liquid–gas partition coefficients (HLC) of volatile organic compounds (VOCs) in water–air systems are determined using a novel dynamic approach by coupling a stripping cell directly to a proton-Transfer-Reaction mass spectrometer (PTR–MS). Two complementary set-ups are evaluated, one suited for determining HLCs of highly volatile compounds (

  • Trace gas monitoring at the Mauna Loa Baseline Observatory using Proton-Transfer Reaction Mass Spectrometry
    International Journal of Mass Spectrometry, 2002
    Co-Authors: Thomas Karl, Armin Hansel, Werner Lindinger, Tilmann D. Märk, David Hoffmann
    Abstract:

    Real time monitoring of volatile organic compounds (VOCs) using a Proton-Transfer Reaction Mass Spectrometer was performed at the Mauna Loa Baseline Station (19.54N, 155.58W) in March/April 2001 (March 23, 2001–April 17, 2001). Mixing ratios for methanol, acetone, acetonitrile, isoprene and methyl vinyl ketone (MVK) plus methacrolein (MACR) ranged between 0.2 and 1.8, 0.2 and 1, 0.07 and 0.2,

  • Analysing the headspace of coffee by proton-Transfer-Reaction mass-spectrometry
    International Journal of Mass Spectrometry, 2002
    Co-Authors: Chahan Yeretzian, Alfons Jordan, Werner Lindinger
    Abstract:

    Abstract An extensive analysis of the headspace (HS) of coffee brew using proton-Transfer-Reaction mass-spectrometry (PTR-MS) is presented. In particular, we present a set of methods that link mass spectral peaks, as observed in PTR-MS, to chemical compounds in the HS of coffee. Combining all this information, a tentative assignment and rough quantification of liquid coffee HS is presented. Coffee was chosen because it contains a large number of chemically diverse volatile organic compounds (VOCs), representing a challenging system for on-line analysis by PTR-MS.

  • Quantification of passive smoking using proton-Transfer-Reaction mass spectrometry
    International Journal of Mass Spectrometry, 1998
    Co-Authors: P. Prazeller, Armin Hansel, Thomas Karl, A. Jordan, Rupert Holzinger, Werner Lindinger
    Abstract:

    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 one to two cigarettes.

Armin Hansel - One of the best experts on this subject based on the ideXlab platform.

Yannan Chu - One of the best experts on this subject based on the ideXlab platform.

  • V-shaped ion funnel proton Transfer Reaction mass spectrometry
    Instrumentation Science & Technology, 2019
    Co-Authors: Yujie Wang, Kexiu Dong, Yannan Chu
    Abstract:

    AbstractA V-shaped ion funnel (IF) drift tube was developed for proton Transfer Reaction mass spectrometry (PTR-MS). The ion transmissions were characterized at variable radio frequency voltages an...

  • Detection of Ketones by a Novel Technology: Dipolar Proton Transfer Reaction Mass Spectrometry (DP-PTR-MS).
    Journal of the American Society for Mass Spectrometry, 2017
    Co-Authors: Yue Pan, Chengyin Shen, Hongmei Wang, Huang Chaoqun, Qiangling Zhang, Wenzhao Zhou, Xue Zou, Yannan Chu
    Abstract:

    Proton Transfer Reaction mass spectrometry (PTR-MS) has played an important role in the field of real-time monitoring of trace volatile organic compounds (VOCs) due to its advantages such as low limit of detection (LOD) and fast time response. Recently, a new technology of proton extraction Reaction mass spectrometry (PER-MS) with negative ions OH– as the reagent ions has also been presented, which can be applied to the detection of VOCs and even inorganic compounds. In this work, we combined the functions of PTR-MS and PER-MS in one instrument, thereby developing a novel technology called dipolar proton Transfer Reaction mass spectrometry (DP-PTR-MS). The selection of PTR-MS mode and PER-MS mode was achieved in DP-PTR-MS using only water vapor in the ion source and switching the polarity. In this experiment, ketones (denoted by M) were selected as analytes. The ketone (molecular weight denoted by m) was ionized as protonated ketone [M + H]+ [mass-to-charge ratio (m/z) m + 1] in PTR-MS mode and deprotonated ketone [M – H]– (m/z m – 1) in PER-MS mode. By comparing the m/z value of the product ions in the two modes, the molecular weight of the ketone can be positively identified as m. Results showed that whether it is a single ketone sample or a mixed sample of eight kinds of ketones, the molecular weights can be detected with DP-PTR-MS. The newly developed DP-PTR-MS not only maintains the original advantages of PTR-MS and PER-MS in sensitive and rapid detection of ketones, but also can estimate molecular weight of ketones.

  • Triacetone triperoxide detection using low reduced-field proton Transfer Reaction mass spectrometer
    International Journal of Mass Spectrometry, 2009
    Co-Authors: Chengyin Shen, Haiyan Han, Hongmei Wang, Haihe Jiang, Yannan Chu
    Abstract:

    Abstract Proton Transfer Reaction mass spectrometry (PTR-MS) was applied to on-line detection of the explosive triacetone triperoxide (TATP) using a discharge gas of water vapor or alternative ammonia in the ion source. The dependence of ionic intensity on reduced-field in the drift tube was investigated, and the results indicate that an irregular operation using low reduced-field can enhance TATP detection due to reduced collision-induced dissociation in the drift tube. When water vapor is used as the discharge gas, the characteristic ions for TATP identification are [TATP + H] + which are detectable at a reduced-field about 50 Td. If ammonia is the discharge gas, PTR-MS exhibits a better sensitivity, the explosive TATP can be discriminated according to the adduct ions [TATP + NH 4 ] + , and a limit of detection at ppb level can be achieved at a reduced-field around 100 Td in this PTR-MS apparatus. PTR-MS is suggested as a potential tool for on-site detection of the explosive TATP with the advantages of rapid response and high sensitivity without sample pretreatment.

  • 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
    Co-Authors: Yujie Wang, Haiyan Han, Chengyin Shen, Hongmei Wang, Yannan Chu
    Abstract:

    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. The most abundant characteristic ions in the PTR-MS and IMR-MS measurements are observed at m/z 99 and 98 respectively, which are the results of soft ionizations that a residual chemical undergoes the proton Transfer Reaction in PTR-MS and the charge Transfer Reaction in IMR-MS. On the basis of ionic intensity dependence on the reduced-field in the PTR-MS investigation, the residue can be unambiguously identified as cyclohexanone, a commonly used adhesive agent in PVC medical device manufacture. Quantitative measurement by PTR-MS shows that concentrations of cyclohexanone in the packages of two types of infusion sets are 11 and 20 ppm respectively. Due to fast response, absolute concentration detection, and high sensitivity, the PTR-MS and IMR-MS detection methods are proposed for the quality control of medical devices including the detection of illegal or excessive uses of chemical solvents like cyclohexanone.

Tilmann D. Märk - One of the best experts on this subject based on the ideXlab platform.

  • Assessment of Trentingrana cheese ageing by proton Transfer Reaction-mass spectrometry and chemometrics
    International Dairy Journal, 2007
    Co-Authors: Eugenio Aprea, Franco Biasioli, Flavia Gasperi, D. Mott, Federico Marini, Tilmann D. Märk
    Abstract:

    Proton Transfer Reaction-mass spectrometry (PTR-MS) data have been analysed by chemometric techniques to monitor cheese ageing by means of on-line direct head-space gas analysis. Twenty cheese loaves of Trentingrana, a trademarked cheese produced in northern Italy, of different origin and ripening degree, were sampled over the whole Trentingrana production area. An increase of the spectral intensity with ripening has been observed for most of the PTR-MS peaks and a univariate analysis identified 16 mass peaks that were significantly different for ripened and young cheeses, respectively. Moreover, the usefulness of different discriminant analyses and class modelling techniques have been investigated. Discriminant Partial Least Squares analysis, while indicating average behaviour and possible outliers, was not able to correctly classify all samples. Soft class modelling performed better and allowed a 100% correct classification. Partial least square calibration predicted the ageing time of each loaf with reasonable accuracy with a maximum cross-validation error of 3.5 months.

  • Proton Transfer Reaction−Mass Spectrometry (PTR-MS) Headspace Analysis for Rapid Detection of Oxidative Alteration of Olive Oil
    Journal of agricultural and food chemistry, 2006
    Co-Authors: Eugenio Aprea, Franco Biasioli, Tilmann D. Märk, Graziano Sani, Claudio Cantini, Flavia Gasperi
    Abstract:

    Olive oil has been characterized by rapid proton Transfer Reaction−mass spectrometry (PTR-MS) headspace analysis without any concentration of the volatiles or pretreatment of the samples. Compariso...

  • Coupling proton Transfer Reaction-mass spectrometry with linear discriminant analysis: a case study.
    Journal of agricultural and food chemistry, 2003
    Co-Authors: Franco Biasioli, E. Boscaini, Eugenio Aprea, Flavia Gasperi, D. Mott, Dagmar Mayr, Tilmann D. Märk
    Abstract:

    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 distinguished by linear discriminant analysis (LDA) on PTR-MS spectra compressed by discriminant partial least squares (dPLS). In a second experiment two varieties were investigated as to whether different growing conditions (open field, tunnel), location, and/or harvesting time can affect the proposed classification method. Internal cross-validation gives 27 successes of 28 tests for the 9 varieties experiment and 100% for the 2 clones experiment (30 samples). For one clone, present in both experiments, the models developed for one experiment were successfully tested with the homogeneous independent data of the other with success rates of 100% (3 of 3) and 93% (14 of 15), respectively. This is an indication that the proposed combination of PTR-MS with discriminant analysis and class modeling provides a new and valuable tool for product classification in agroindustrial applications.

  • Membrane introduction proton-Transfer Reaction mass spectrometry
    International Journal of Mass Spectrometry, 2002
    Co-Authors: Michael L. Alexander, Werner Lindinger, E. Boscaini, Tilmann D. Märk
    Abstract:

    Abstract The combination of membrane introduction mass spectrometry (MIMS) and proton-Transfer Reaction mass spectrometry (PTR-MS) is explored. The PTR-MS is used to measure properties of a well-characterized membrane material, poly-dimethylsiloxane (PDMS). It is found that the ability of the PTR-MS to measure absolute concentrations in real-time makes it an ideal tool for the characterization of membrane properties and the interaction of the membrane with multiple organic species. Values for the diffusion coefficients of several molecules are measured and found to be in agreement with literature values. Time modulation of the analyte across the membrane is explored as a method of resolving isobaric interferences for different chemical species. This is demonstrated for acetone and propanal. Finally, the benefit of combining MIMS with PTR-MS is demonstrated by the direct analysis of organic species in the headspace of a hot water solution where the high humidity would not allow analysis using the PTR-MS alone.

  • Trace gas monitoring at the Mauna Loa Baseline Observatory using Proton-Transfer Reaction Mass Spectrometry
    International Journal of Mass Spectrometry, 2002
    Co-Authors: Thomas Karl, Armin Hansel, Werner Lindinger, Tilmann D. Märk, David Hoffmann
    Abstract:

    Real time monitoring of volatile organic compounds (VOCs) using a Proton-Transfer Reaction Mass Spectrometer was performed at the Mauna Loa Baseline Station (19.54N, 155.58W) in March/April 2001 (March 23, 2001–April 17, 2001). Mixing ratios for methanol, acetone, acetonitrile, isoprene and methyl vinyl ketone (MVK) plus methacrolein (MACR) ranged between 0.2 and 1.8, 0.2 and 1, 0.07 and 0.2,

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