Mass Spectra of Esters.  Formation of Rearrangement Ions

Sharkey, A.G.; Shultz, J.L.; Friedel, R. A.

doi:10.1021/ac60145a016

Cited by 107 publications

(37 citation statements)

References 46 publications

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“…Approximate (±0.10 eV) appearance energy estimates for these fragments are given in Table 2. The appearance energy for the m/z = 75 CH 3 CH 2 C(OH) 2 + ion is in good agreement with the 10.77 eV value reported by Godbole and Kebarle [18]; no previous measurements are available for other fragment ions of Table 2, although each of these fragments are observed in conventional electron ionization mass spectrometry [50,51]. The dissociative pathways leading to the fragment ions of Table 2 have yet to be determined; thus the suggested neutral species are tentative, subject to revision pending detailed studies of isomerization/dissociation mechanisms.…”

Section: Ethyl Propanoatesupporting

confidence: 86%

Absolute cross-sections for dissociative photoionization of some small esters

Wang

Yang

Cool

et al. 2010

International Journal of Mass Spectrometry

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Section: Ethyl Propanoatesupporting

confidence: 86%

Absolute cross-sections for dissociative photoionization of some small esters

Wang

Yang

Cool

et al. 2010

International Journal of Mass Spectrometry

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“…Tri-heneicosanoin was used as a surrogate in plasma samples to adjust for extraction efficiency. To detect 13 C enrichment in palmitic acid (C16:0) area counts were obtained for the McLafferty ion (MCI) and the MCI +1 (m/z =74 and 75 respectively) (Sharkey et al, 1959) using GC MS solution software (Shimadzu Corporation, Japan).…”

Section: Methodsmentioning

confidence: 99%

Microbiota-Dependent Hepatic Lipogenesis Mediated by Stearoyl CoA Desaturase 1 (SCD1) Promotes Metabolic Syndrome in TLR5-Deficient Mice

et al. 2015

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SUMMARY The gut microbiota plays a key role in host metabolism. Toll-Like Receptor 5 (TLR5), a flagellin receptor, is required for gut microbiota homeostasis. Accordingly, TLR5 deficient (T5KO) mice are prone to develop microbiota-dependent metabolic syndrome. Here we observed that T5KO mice display elevated neutral lipids with a compositional increase of oleate [C18:1 (n9)] relative to wild-type littermates. Increased oleate contribution to hepatic lipids and liver SCD1 expression were both microbiota-dependent. Analysis of short chain fatty acids (SCFA) and 13C-acetate label incorporation revealed elevated SCFA in ceca and hepatic portal blood and, increased liver de novo lipogenesis in T5KO mice. Dietary SCFA further aggravated metabolic syndrome in T5KO mice. Deletion of hepatic SCD1 not only prevented hepatic neutral lipid oleate enrichment but also ameliorated metabolic syndrome in T5KO mice. Collectively, these results underscore the key role of the gut microbiota-liver axis in the pathogenesis of metabolic diseases.

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“…The detailed structural composition of the different high molecular weight wax esters identified in elephant grass is shown in Table 2. The esterified fatty acids ranged from C 14 to C 22 and the esterified fatty alcohols from C 18 to C 30 . The acyl moiety of the high molecular weight wax esters was exclusively constituted by saturated fatty acids with even carbon number.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Lipophilic Extractives from the Cortex and Pith of Elephant Grass (Pennisetum purpureum Schumach.) Stems

Prinsen

Gutiérrez

Río

2012

J. Agric. Food Chem.

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The composition of lipophilic extractives in the cortex and pith of elephant grass (Pennisetum purpureum Schumach.) stems was thoroughly studied by gas chromatography−mass spectrometry. The predominant compounds were fatty acids followed by sterols (in free and conjugated forms as esters and glycosides). Other steroid compounds, as steroid hydrocarbons and ketones, were also present. Additionally, important amounts of mono-, di-, and triglycerides were identified. Other aliphatic series such as n-alkanes, n-fatty alcohols, and n-alkyl ferulates, together with tocopherols and a series of high molecular weight esters, were also found, although in minor amounts. The analyses also revealed the presence of a β-diketone (12,14-tritriacontanedione), which was particularly abundant in the cortex. Finally, two lignans, matairesinol and syringaresinol, were also detected. In general terms, the abundances of the different classes of compounds were higher in the pith, except for the series of n-fatty alcohols, n-alkyl ferulates, β-diketones, and lignans, which were more prominent in the cortex.

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Mass Spectra of Esters. Formation of Rearrangement Ions

Cited by 107 publications

References 46 publications

Absolute cross-sections for dissociative photoionization of some small esters

Absolute cross-sections for dissociative photoionization of some small esters

Microbiota-Dependent Hepatic Lipogenesis Mediated by Stearoyl CoA Desaturase 1 (SCD1) Promotes Metabolic Syndrome in TLR5-Deficient Mice

Lipophilic Extractives from the Cortex and Pith of Elephant Grass (Pennisetum purpureum Schumach.) Stems

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