The goal of this work is to demonstrate that it is possible to perform quantitative ethylene (C2H4) measurements using PTR-MS. In order to demonstrate that this is possible, we need to investigate the reactions that take place in the PTR-MS with ethylene. New PTR-MS instruments allow to choose between the three primary ions H3O+, O2 + and NO+ [1], hence the name Selective Reagent Ion - Mass Spectrometry (SRI-MS). Moreover, O2 + and NO+ are the ions typically encountered in H3O+ mode and can act as parasitic, precursor ions [2,3].We performed extensive calibrations using ethylene external standards at different instrumental conditions and showed that it is possible to accurately predict ethylene concentrations by considering ethylene reaction with O2 + ions, which are found to proceed at about collision rate. We also showed that NO+ ions do not react with ethylene while for H3O+ ions the reation proceeds much below collision rate.We tested our methodology on real samples (fruits, leaves and bacteria) and compared the results with an optical ethylene sensor. A very good agreement was found. Moreover, we demostrated that SRI-MS has a broader dynamic range and a better linearity than the optical sensor

Makhoul, S.; Cappellin, L.; Romano, A.; Schuhfried, E.; Ahrar, M.; Farneti, B.; Costa, F.; El Nakat, H.; Biasioli, F. (2013). Absolute real-time non-destructive ethylene detection with SRI-MS and PTRMS:the example of fruits, leaves and bacteria. In: F. Biasioli (editor), 3rd MS Food day, October 9-11, 2013, Trento. San Michele all'Adige (TN): Fondazione Edmund Mach: 241-243 (P.73). ISBN: 978-88-7843-035-8. handle: http://hdl.handle.net/10449/22771

Absolute real-time non-destructive ethylene detection with SRI-MS and PTRMS: the example of fruits, leaves and bacteria

Makhoul, Salim;Cappellin, Luca;Romano, Andrea;Ahrar, Mastaneh;Farneti, Brian;Costa, Fabrizio;Biasioli, Franco
2013-01-01

Abstract

The goal of this work is to demonstrate that it is possible to perform quantitative ethylene (C2H4) measurements using PTR-MS. In order to demonstrate that this is possible, we need to investigate the reactions that take place in the PTR-MS with ethylene. New PTR-MS instruments allow to choose between the three primary ions H3O+, O2 + and NO+ [1], hence the name Selective Reagent Ion - Mass Spectrometry (SRI-MS). Moreover, O2 + and NO+ are the ions typically encountered in H3O+ mode and can act as parasitic, precursor ions [2,3].We performed extensive calibrations using ethylene external standards at different instrumental conditions and showed that it is possible to accurately predict ethylene concentrations by considering ethylene reaction with O2 + ions, which are found to proceed at about collision rate. We also showed that NO+ ions do not react with ethylene while for H3O+ ions the reation proceeds much below collision rate.We tested our methodology on real samples (fruits, leaves and bacteria) and compared the results with an optical ethylene sensor. A very good agreement was found. Moreover, we demostrated that SRI-MS has a broader dynamic range and a better linearity than the optical sensor
Ethylene
PTR-MS
SRI-MS
978-88-7843-035-8
Makhoul, S.; Cappellin, L.; Romano, A.; Schuhfried, E.; Ahrar, M.; Farneti, B.; Costa, F.; El Nakat, H.; Biasioli, F. (2013). Absolute real-time non-destructive ethylene detection with SRI-MS and PTRMS:the example of fruits, leaves and bacteria. In: F. Biasioli (editor), 3rd MS Food day, October 9-11, 2013, Trento. San Michele all'Adige (TN): Fondazione Edmund Mach: 241-243 (P.73). ISBN: 978-88-7843-035-8. handle: http://hdl.handle.net/10449/22771
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10449/22771
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