New PDF release: Analytic perturbation theory for matrices and operators

By Hellmut Baumgartel

ISBN-10: 3764316640

ISBN-13: 9783764316648

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In general, the use of these mass spectrometers limits not only the number of ions/transitions that can be monitored for each analyte but also the total number of analytes that can be analyzed to obtain acceptable detectability in (ultra)trace analysis. In contrast to these scanning instruments, a time-of-flight MS (TOFMS) allows acquisition of full mass spectra without the loss of sensitivity [11]. Currently, three types of TOFMS instruments differing in their basic characteristics are available: (i) high-resolution/accurate mass analyzers (7000 full width at half maximum (FWHM) providing only moderate acquisition speed (up to 20 spectra/s), (ii) unit-resolution instruments that feature high acquisition speeds (up to 500 spectra/s), and (iii) high-speed high-resolution/accurate mass analyzers permitting high acquisition speeds (up to 200 spectra/s) as well as high mass resolving power (50,000 FWHM).

Developed a MALDI-based robust method for high-throughput forensic screening of milk powder adulteration by cheap vegetable oils and fats based on the profile of triacylglycerols [78]. With regard to simple sample preparation (sample shaken with n-hexane for 1 min followed by centrifugation for 2 min) and direct examination without prior chromatographic separation, the proposed method showed significant time-saving advantages compared with traditional methods using GC or LC (overall procedure time below 10 min per sample).

A blank sample extract is injected under the same conditions as those for the assay. Any variation in ESI response of the infused analyte caused by an endogenous compound that elutes from the column is seen as a matrix effect. If no matrix effect exists, a steady ion response is obtained as a function of time because the analyte is infused into the MS at a constant flow (concentration). In the postextraction spike method, matrix effects are quantitatively accessed by comparing the response of an analyte in neat solution with the response of the analyte spiked into a blank matrix sample that has been carried through the sample preparation process [54].

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Analytic perturbation theory for matrices and operators by Hellmut Baumgartel

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