The mass spectrum of 1-(2-thienyl) hexane-1-13C is reported. The principal fragmentation routes ofthe parent ion are delineated. Beta cleavage of the alkyl chain predominates, and the label retention indicates that the alpha carbon atom remains with the charged ring moiety. A substantial part...
A mass spectrum of fragments is characteristic for a metabolite and, to some degree, can be used to identify the original metabolite by comparing the spectrum to those stored in spectral libraries (See also Section 6). MS/MS makes it possible to look at specific precursors and the resulting ...
formation of surface carbon species under a reducing atmosphere strongly shifts the product spectrum to the C3-alkene at the expense of hydrogenolysis ... B Frank,TP Cotter,ME Schuster,... - 《Chemistry》 被引量: 7发表: 2013年 Studies on the catalytic hydrogenation of Baylis Hillman derivatives...
The invention relates to accurate determination of the position coordinate that is the location, frequency or time coordinate of an ion peak in a mass spectrum, as the basis for an accurate mass determination of the ions.;The invention consists of fitting a suitable function, e.g. a superposit...
Tsing Hua Technology owns Hsin Chu Laboratory, which occupies about 500 pings in area and has more than 80 employees. It has a full spectrum of precision instruments, including gas chromatography (GC), gas chromatography-mass spectrometer(GC-MS), high performance liquid chromatography (HPLC), tota...
If a compound contains a single nitrogen atom, or any odd number of nitrogen atoms, its mass is an odd number. If the mass spectrum of a compound is an even number, then it has either an even number of nitrogen atoms, or none. View chapterExplore book Analysis of Glycans; ...
interpreting the C = C position, the MS/MS spectrum of the 14 eV KE maintains the pattern in various phospholipid subclasses (Fig.1b–dand Supplementary Fig.2). The potential mechanism for the increase in product ions abundance adjacent to the double bond is the stabilization of the ...
1 Overview of the oxygen attachment dissociation (OAD) mass fragmentation scheme with authentic lipid standards. a Two major schemes of OAD. Neutral loss values are presented in case of n-9. b The OAD coupled with tandem mass spectrometry (OAD-MS/MS) spectrum of PC 18:1/18:1(n-9) and...
The mass spectrum of n-hexane recorded with one of the traps has been studied in detail and the conditions necessary to improve performance have been found to parallel those required for the QUISTOR, having quadrupole geometry. The first analysis of the mass-selective storage mass spectrum of a...
A mass spectrum is obtained by changing the electrode voltages to eject the ions from the trap. In a 2D linear ion trap, however, ions are confined in the axial dimension by means of an electric field at the ends of the quadrupole. A quadrupole ion trap instrument (QTRAP) is a hybrid ...