1,721,015 research outputs found
Comprehensive 2D GC combined with novel MS instrumentation: powerful unified tools for the analysis of complex samples
No full textFlow-modulated GC × low-pressure-GC: a novel approach fro high resolution/sensitivity separations in gas chromatography
No full textFlow-modulation low-pressure comprehensive two-dimensional gas chromatography
No full textThe present research is specifically based on the use of greatly-reduced gas flows, in flow-modulator (FM) comprehensive two-dimensional gas chromatography systems. In particular, focus of the present research is directed to FM devices characterized by an accumulation stage, and a much briefer re-injection step. It has been widely accepted that the operation of such FM systems requires high gas flows (≥20. mL/min), to re-inject the gas-phase contents of sample (or accumulation) loops, onto the second column. On the contrary, it will be herein demonstrated that much lower gas flows (≈ 6-8. mL/min) can efficiently perform the modulation step of re-injection. The possibility of using such improved operational conditions is given simply by a fine optimization of the processes of accumulation and re-injection. The application of lower gas flows not only means that second-dimension separations are carried out under better analytical conditions, but, even more importantly, greatly reduces problems which arise when using mass spectrometry (i.e., sensitivity and instrumental pumping capacity)
GC multidimensionale “comprehensive” con modulazione a flusso: è questo il futuro delle separazioni GC ad alta risoluzione?
No full textUse of greatly-reduced gas flows in flow-modulated comprehensive two-dimensional gas chromatography-mass spectrometry
No full textThe present research is specifically based on the use of greatly-reduced gas flows, in flow-modulator (FM) comprehensive two-dimensional gas chromatography systems. In particular, focus of the present research is directed to FM devices characterized by an accumulation stage, and a much briefer re-injection step. It has been widely accepted that the operation of such FM systems requires high gas flows (≥20. mL/min), to re-inject the gas-phase contents of sample (or accumulation) loops, onto the second column. On the contrary, it will be herein demonstrated that much lower gas flows (≈ 6-8. mL/min) can efficiently perform the modulation step of re-injection. The possibility of using such improved operational conditions is given simply by a fine optimization of the processes of accumulation and re-injection. The application of lower gas flows not only means that second-dimension separations are carried out under better analytical conditions, but, even more importantly, greatly reduces problems which arise when using mass spectrometry (i.e., sensitivity and instrumental pumping capacity)
Low-flow modulation comprehensive 2D GC-high resolution ToF MS: a powerful tool for untargeted, pre- and post-targeted analysis
No full textConcept of (low-)flow modulation comprehensive two-dimensional gas chromatography under sub-ambient, ambient and supra-ambient pressure outlet conditions
No full textPotential of Comprehensive Two-Dimensional Gas Chromatography for the Analysis of Lipids
No full textThe field of lipid analysis is an extremely important area of research in food chemistry; such
importance is related to the fundamental biological functions of lipids such as structural components of cell membranes, energy storage
compounds, signaling molecules, etc. From a
human nutritional viewpoint, oils and fats provide
not only energy but also essential fatty acids,
polyunsaturated fatty acids (PUFAs), sterols, and
vitamins. Additionally, lipids play a crucial role in
human health; in fact, a number of disease states
are related to an excessive or unbalanced lipid
consumptio
Fast GC combined with a high-speed triple quadrupole mass spectrometer for the simultaneous analysis of unknown and target Citrus essential oil analytes
No full textPotential and advantages of using a high performance liquid chromatography pre-separation step, prior to comprehensive two-dimensional gas chromatography-mass spectrometry essential oil analysis
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