A selected ion flow tube study of the reactions of H3O+, NO+, and O2+ with saturated and unsaturated aldehydes and subsequent hydration of the product ions |
| |
| Institution: | 1. V. C̆ermák Laboratory, J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejs̆kova 3, 182 23, Prague 8, Czech Republic;2. Chemistry Department, College of the Holy Cross, 1 College Street, Worcester, MA, 01610-2395, USA;3. Centre for Science and Technology in Medicine, School of Postgraduate Medicine, Keele University, Thornburrow Drive, Hartshill, Stoke-on-Trent, ST4 7QB, UK;1. Department of Chemistry, Sejong University, Seoul 143-747, South Korea;2. Center for Interdisciplinary Molecular Science, Department of Applied Chemistry, National Chiao Tung University, Hsinchu 300, Taiwan;1. Universite de Paris Est, Institut de Chimie et des Matériaux Paris Est, CNRS-UPEC, UMR7182, 2-8 rue Henri Dunant, 94320 Thiais, France;2. Institute of High Pressure Physics PAS, ul. Sokolowska 29, 01-142 Warsaw, Poland;1. Department of Chemistry, University of Nevada-Las Vegas, Las Vegas, NV 89154, USA;2. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;3. Lawrence Livermore National Laboratory, Livermore, CA 94551, USA;4. Department of Health Physics, University of Nevada-Las Vegas, Las Vegas, NV 89154, USA;5. Argonne National Laboratory, Lemont, IL 60439, USA;1. H. H. Dow High School, Midland, MI 48640, USA;2. Lyman Briggs College and Department of Chemistry, Michigan State University, East Lansing, MI 48825, USA |
| |
| Abstract: | We have carried out a selected ion flow tube (SIFT) study of the reactions of H3O+, NO+, and O2+ ions with several saturated and unsaturated aldehydes. This study is mainly directed toward providing the essential data for a projected SIFT mass spectrometry (SIFTMS) study of the volatile emissions from cooked meats, which always include aldehydes. Thus, it is necessary to know the rate coefficients and the product ions of the reactions of the above-mentioned ions, used as the precursor ions for SIFTMS analyses, with the aldehydes, if proper identification and quantification of the emitted species are to be achieved. The results of this study show that the reactions of H3O+ with the aldehydes, M, result in the protonated molecules MH+ and for the saturated aldehydes also in (M - OH)+ ions resulting from the loss of a H2O molecule from the nascent MH+ ion. The NO+ reactions invariably proceed via the process of hydride ion, H−, transfer producing (M - H)+ ions, but parallel minor association product ions NO+ · M are observed for some of the unsaturated aldehyde reactions. The O2+ reactions proceed by way of charge transfer producing nascent M+ ions that partially dissociate producing fragment ions. Because water vapour is invariably present in real samples analysed by SIFTMS, the current experiments were also carried out following the introduction of humid laboratory air into the helium carrier gas of the SIFT. Thus, the reactions of the product ions that form hydrates were also studied as a prelude to future SIFTMS studies of the (humid) emissions from cooked meats. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
