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Select-eV

Application Note 522: Characterisation of allergens in cosmetics by GC×GC–TOF MS with Select-eV variable-energy electron ionisation
This Application Note shows that BenchTOF instruments, coupled with GC×GC, can provide a high-performance solution for the detection and quantitation of allergens in complex cosmetics extracts. Revolutionary variable-energy electron ionisation technology was also shown to enhance both the sensitivity and selectivity of analyses by generating mass spectra containing structurally-significant fragment ions with an improved molecular ion signal.
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Application Note 523: Enhancing aroma profiling of wine with GC–TOF MS
This Application Note shows that BenchTOF time-of-flight mass spectrometers, coupled with GC, can provide a high-performance solution for the detection and quantitation of aroma compounds in wine extracts. In particular, we show how the ChromCompare software module allows rapid identification of differences between samples, and how Select-eV variable-energy ionisation capability enhances both the sensitivity and selectivity of analyses.
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Application Note 524: Analysis of complex petrochemicals by GC×GC–TOF MS with Select-eV variable-energy electron ionisation
This Application Note shows that BenchTOF instruments, coupled with GC×GC, can provide a high-performance solution for the characterisation of hydrocarbons in complex petrochemical samples. Select-eV variable-energy electron ionisation technology is also shown to enhance analyte speciation by providing additional data on both molecular ions and structurally significant fragments in the low-energy mass spectra, as well as increasing the number of compounds identified by enhancing sensitivity and selectivity.
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Application Note 525: Rapid analysis of environmental contaminants by fast GC–TOF MS with Select-eV variable-energy electron ionisation
This Application Note shows that BenchTOF time-of-flight mass spectrometers provide a robust, high-performance and high-throughput solution for screening multiple trace-level environmental contaminants. Revolutionary variable-energy electron ionisation is also shown to aid compound identification and enhance the selectivity and sensitivity of analyses by generating secondary (qualifying) mass spectra with reduced fragmentation and a stronger molecular ion signal.
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Application Note 528: Select-eV: The next generation of ion source technology
This Application Note describes Select-eV, a new development in ion-source technology for GC–MS that allows the energy of electron ionisation to be reduced on a sliding scale from 70 eV to 10 eV without impacting sensitivity, simply by changing a parameter in the method. As well as describing the theoretical background to the technique and the benefits that stem from low-energy (‘soft’) electron ionisation, we point out, through a series of application examples, how Select-eV breaks new ground by avoiding the inconveniences typically associated with soft ionisation techniques for GC–MS.
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Application Note 531: Extended detection limits for GC–TOF MS of organotins using Select-eV variable-energy electron ionisation
This Application Note demonstrates how the enhanced sensitivity and selectivity of the BenchTOF time-of-flight mass spectrometer with Select-eV variable-energy electron ionisation can provide ultra-trace-level quantitation of organotins in complex environmental extracts. We focus on how Select-eV soft ionisation offers particular advantages in the analysis of organotin species, which undergo extensive fragmentation at conventional 70 eV ionisation energies, by producing simplified spectra with enhanced diagnostic ions.
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Application Note 532: Comprehensive characterisation of essential oil by GC×GC–TOF MS
This Application Note shows that BenchTOF time-of-flight mass spectrometers, in conjunction with GC×GC, provide a high-performance solution for comprehensively screening the total composition of essential oils.
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Application Note 535: Comparison of the aroma profiles of hops by TD–GC–TOF MS with Select-eV variable-energy electron ionisation
This Application Note demonstrates the high performance of a TD–GC–TOF MS system for the analysis of complex aroma profiles from hops. The use of complementary soft electron ionisation provides enhanced confidence in the identification of terpenoids, while the comparison of hop varieties is simplified by near-real-time analysis in the accompanying software package.
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Application Note 537: Comprehensive insights into tobacco smoke constituents using TD–GC×GC–TOF MS with Tandem Ionisation
This Application Note demonstrates the enhanced separation and unparalleled sensitivity that can be achieved in the characterisation of cigarette smoke, using thermal desorption (TD) and GC×GC with BenchTOF time-of-flight mass spectrometry, aided by Tandem Ionisation for simultaneous acquisition of hard and soft EI data.
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Application Note 538: Detailed characterisation of essential oils by flow-modulated GC×GC–TOF MS with Tandem Ionisation
In this Application Note, we describe the use of comprehensive two-dimensional gas chromatography (GC×GC) with BenchTOF time-of-flight mass spectrometry (TOF MS) and Tandem Ionisation for characterisation and comparison of the composition of essential oils, aiding rigorous quality control.
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UK
UK
Markes International Ltd
Gwaun Elai Medi-Science Campus
Llantrisant
RCT
CF72 8XL, UK
Tel: +44 (0)1443 230935
Germany
Germany
Markes International GmbH
Schleussnerstrasse 42
D-63263 Neu-Isenburg
Frankfurt
Germany
Tel: +49 (0)6102 8825569
USA (West)
USA
Markes International, Inc
2355 Gold Meadow Way
Gold River
California 95670
USA
Tel: 866-483-5684 (toll-free)
Part of Schauenburg International
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