Qualitative and quantitative approaches in comprehensive two-dimensional gas chromatography

Murray, Jacolin A.

doi:10.1016/j.chroma.2012.05.012

Cited by 94 publications

(47 citation statements)

References 132 publications

(159 reference statements)

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“…A multivariate regression technique such as partial least squares (PLS) allows for all possible ratios of all of the thousands of peaks in a GC Â GC chromatogram to be considered in a single algorithm. PLS regression has been in use in chemical analysis for decades and has been successfully applied to GC Â GC data (de Godoy et al, 2011;Geladi and Kowalski, 1986;Johnson et al, 2004;Murray, 2012;Pierce and Mohler, 2011;Prazen et al, 2001;Wold et al, 1984). Utilizing the whole chromatogram in this manner is the best means to analyze for trends without imposing presuppositions about what chromatographic peaks may or may not be important.…”

Section: Introductionmentioning

confidence: 98%

Oxygenated weathering products of Deepwater Horizon oil come from surprising precursors

Hall

Frysinger

Aeppli

et al. 2013

Marine Pollution Bulletin

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Section: Introductionmentioning

confidence: 98%

Oxygenated weathering products of Deepwater Horizon oil come from surprising precursors

Hall

Frysinger

Aeppli

et al. 2013

Marine Pollution Bulletin

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“…the profile of volatile organic compounds). The latter method is preferred because it disposes of several advantages: (I) enhanced peak capacity, (II) higher power signal/noise ratio, and thus resolution, and (III) obtaining of 'structured' chromatograms (Murray 2012). GCxGC was successfully employed for studying VOCs in different wines (Weldegergis et al 2011a).…”

mentioning

confidence: 99%

Effect of indigenous S. cerevisiae strains on higher alcohols, volatile acids and esters in wine

Furdíková¹,

Makyšová²,

S̆pánik³

2017

Czech J. Food Sci.

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Furdíková K., Makyšová K., Špánik I. (2017): Effect of indigenous S. cerevisiae strains on higher alcohols, volatile acids, and esters in wine. Czech J. Food Sci., 35: 131-142.Higher alcohols, volatile fatty acids, and esters are the most important volatiles and their formation is closely related to yeast strains employed during fermentation. In the present work, the effect of indigenous yeast strains on selected wine volatiles was examined using a highly sophisticated analytical method -comprehensive two-dimensional gas chromatography. Results of the statistical analysis revealed that each strain could be characterised and differentiated according to its volatile composition: strain Y2 was characterised by 2-phenylethanol and 1-hexanol, strain Y1 was in close relationship with high amounts of 4-methyl-1-pentanol, iso-amyl alcohol, ethyl 3-hydroxypentanoate and 3-methylpentanoic acid and strain Y3 was associated with 1-heptanol, cis-3-hexen-1-ol, β-phenylethyl butyrate, octanoic, and decanoic acids. The selection of an appropriate yeast strain thus represents a critical variable affecting the analysed volatile compounds (wine flavour) not only in a qualitative but also in a quantitative way.

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“…Among them were enhanced control of selectivity, sample structure visualization, homolog grouping (group type separations), and sample finger-printing. Several recent reviews have described these advantages [7][8][9]. However, the expectation [1,2,5,6,[10][11][12][13][14][15] and the theoretically proven possibility [3,4,16] of a large peak capacity increase was almost invariably considered as the most prominent potential advantage of GC × GC.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of conditions of comprehensive two-dimensional gas chromatography that yield a near-theoretical maximum in peak capacity gain

Klee¹,

Cochran

Merrick

et al. 2015

Journal of Chromatography A

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The peak capacity gain (Gn) of a GC×GC system is the ratio of the system peak capacity to that of an optimized one-dimensional GC analysis lasting the same time and providing the same detection limit. A near-theoretical maximum in Gn has been experimentally demonstrated in GC×GC-TOF based on a 60m×0.25mm primary column. It was found that Gn was close to 9 compared to the theoretical maximum of about 11 for this system. A six-sigma peak capacity of 4500 was obtained during an 80min heating ramp from 50°C to 320°C. Using peak deconvolution, 2242 individual peaks were determined in a Las Vegas runoff water sample. This is the first definitive experimental demonstration known to us of an order-of-magnitude Gn. The key factors enabling this gain were: relatively sharp (about 20ms at half height) reinjection pulses into the secondary column, relatively long (60m) primary column, the same diameters in primary and secondary columns, relatively low retention factor at the end of the secondary analysis (k≅5 instead of 15, optimal for ideal conditions), optimum flow rate in both columns, and helium (rather than hydrogen) used as the carrier gas. The latter, while making the analysis 65% longer than if using H2, was a better match to the reinjection bandwidth and cycle time.

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Qualitative and quantitative approaches in comprehensive two-dimensional gas chromatography

Cited by 94 publications

References 132 publications

Oxygenated weathering products of Deepwater Horizon oil come from surprising precursors

Oxygenated weathering products of Deepwater Horizon oil come from surprising precursors

Effect of indigenous S. cerevisiae strains on higher alcohols, volatile acids and esters in wine

Evaluation of conditions of comprehensive two-dimensional gas chromatography that yield a near-theoretical maximum in peak capacity gain

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