| Tandem Mass Spectrometric Studies on the [C5H8O2]+· Ions from Angeric Acid and Tigric Acid Esters |
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*a) Toray Research Center, Inc. (1111 Tebiro, Kamakura 248-8555, Japan) Present address: Koriyama Women’s University (3-25-2 Kaisei, Koriyama 963-8851, Japan) b) Toray Research Center, Inc. (1111 Tebiro, Kamakura 248-8555, Japan) |
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| Collision activated dissociation (CAD) spectra and metastable ion (MI) spectra of the [C5H8O2]+· ions from various esters of angeric acid and tigric acid have been studied. The [C5H8O2]+· ions formed upon the McLafferty rearrangement from the precursor esters of these acids were identified as the same structures of the molecular ions directly produced by electron impact ionization of angeric acid and tigric acid respectively on the basis of CAD spectral evidence. The cis-trans isomerization of the acids can occur during ionization or subsequent fragmentation of the lower internal energy ions which proceed via unimolecular metastable decompositions. We have provided an example that the isomeric ions can be distinguished by the ion abundance enhancement by high energy collisional activation on the specific fragmentation reactions of the [C5H8O2]+· ions. | ||
| Key words: Tandem mass spectrometry (MS/MS), [C5H8O2]+· ion, Collision activated dissociation (CAD) spectrum, Metastable ion (MI) spectrum, High energy collisional activation, Angeric acid (ester), Tigric acid (ester), α, β-Unsaturated carboxylic acid ester, McLafferty rearrangement, Tight activated complex, Low internal energy | ||
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