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- W2576670499 abstract "The mechanisms for dissociation of excited neutral methyl stearate and its hydrogen atom adduct were investigated by charge inversion mass spectrometry using an alkali metal target [1]. Migrations of functional group in fatty acid ester ions are often observed in the dissociation of the cations in collisionally activated dissociation (CAD) [2]. In the charge inversion spectrum, main dissociation channels of the methyl stearate molecule (m/z 298) are loss of CH3 (m/z 283) and H atom (m/z 297), as shown in Fig. 1 a). In order to identify the position of CH3 and H, the charge inversion spectrum of partially deuterated methyl stearate (m/z 301), which was synthesized, were measured. By the charge inversion spectra, CH3 and H were clearly identified as the elimination from the alcoxy-methyl group and from the hydrocarbon chain in the fatty acid group, respectively (Fig. 1 b). In the charge inversion spectrum of protonated ester (m/z 299), a peak at m/z 282 was observed (Fig. 2 a). Fig. 2 b showed clearly that this peak results from simultaneous loss of CH3 from the alcoxyl-methyl and H2. A few peaks that are the structure sensitive are observed at the higher mass region in the charge inversion spectra due to dissociations of neutrals, unlike the CAD spectra due to dissociations of ions." @default.
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- W2576670499 date "2004-01-01" @default.
- W2576670499 modified "2023-09-26" @default.
- W2576670499 title "Dissociation mechanisms of excited neutral methyl stearate and its hydrogen atom adduct" @default.
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