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Article

Measurement of 3-Alkyl-2-Methoxypyrazine by Headspace Solid-Phase Microextraction in Spiked Model Wines

Peter J. Hartmann, Harold M. McNair, Bruce W. Zoecklein
Am J Enol Vitic.  2002  53: 285-288  ; DOI: 10.5344/ajev.2002.53.4.285
Peter J. Hartmann
Enology-Grape Chemistry Group, Department of Food Science and Technology, Virginia Tech, Blacksburg, VA 24061.
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Harold M. McNair
Enology-Grape Chemistry Group, Department of Food Science and Technology, Virginia Tech, Blacksburg, VA 24061.
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Bruce W. Zoecklein
Enology-Grape Chemistry Group, Department of Food Science and Technology, Virginia Tech, Blacksburg, VA 24061.
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Abstract

The effect of wine matrix ingredients and conditions on the headspace sampling of 3-alkyl-2-methoxypyrazines was investigated with solid-phase microextraction (SPME) and capillary gas chromatography, using a nitrogen phosphorus detector. Changes in the recovery of 3-ethyl-, isopropyl-, sec-butyl-, and isobutyl-2-methoxypyrazines from the static headspace of synthetic wine matrices spiked with 5 µg/L of each analyte were investigated and reported as a function of SPME fiber type, extraction time, and temperature. The influence of pH, ethanol, phenolics, and oak was studied. Divinylbenzene/carboxen/polydimethylsiloxane (PDMS) SPME fibers at an extraction temperature of 50°C for 30 minutes with 30% (w/v) added sodium chloride resulted in the highest analyte recoveries. Although PDMS (100 µm) SPME fibers at an extraction temperature of 35°C for 30 minutes with 30% (w/v) added sodium chloride resulted in lower analyte recoveries, the fiber remained functional for 50 to 75 analyses after other coatings deteriorated. Changing the sample ethanol concentration from 0 to 20% (v/v) resulted in an exponential decrease in the recovered analytes. Below pH 2, there was extensive loss of the analytes in the headspace. No measurable impact on alkyl-methoxypyrazine headspace concentrations was observed with exposures to selected phenolics and to oak.

  • Gas chromatography
  • solid-phase microextraction
  • alkyl-methoxypyrazines
  • pyrazines
  • Copyright 2002 by the American Society for Enology and Viticulture

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You have accessRestricted access
Measurement of 3-Alkyl-2-Methoxypyrazine by Headspace Solid-Phase Microextraction in Spiked Model Wines
Peter J. Hartmann, Harold M. McNair, Bruce W. Zoecklein
Am J Enol Vitic.  2002  53: 285-288  ; DOI: 10.5344/ajev.2002.53.4.285
Peter J. Hartmann
Enology-Grape Chemistry Group, Department of Food Science and Technology, Virginia Tech, Blacksburg, VA 24061.
  • Find this author on Google Scholar
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Harold M. McNair
Enology-Grape Chemistry Group, Department of Food Science and Technology, Virginia Tech, Blacksburg, VA 24061.
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Bruce W. Zoecklein
Enology-Grape Chemistry Group, Department of Food Science and Technology, Virginia Tech, Blacksburg, VA 24061.
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Measurement of 3-Alkyl-2-Methoxypyrazine by Headspace Solid-Phase Microextraction in Spiked Model Wines
Peter J. Hartmann, Harold M. McNair, Bruce W. Zoecklein
Am J Enol Vitic.  2002  53: 285-288  ; DOI: 10.5344/ajev.2002.53.4.285
Peter J. Hartmann
Enology-Grape Chemistry Group, Department of Food Science and Technology, Virginia Tech, Blacksburg, VA 24061.
  • Find this author on Google Scholar
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Harold M. McNair
Enology-Grape Chemistry Group, Department of Food Science and Technology, Virginia Tech, Blacksburg, VA 24061.
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Bruce W. Zoecklein
Enology-Grape Chemistry Group, Department of Food Science and Technology, Virginia Tech, Blacksburg, VA 24061.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
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