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Related Experiment Videos

Sensitive quantification of sulfur compounds in wine by headspace solid-phase microextraction technique.

Yu Fang1, Michael C Qian

  • 1Department of Food Science and Technology, 100 Wiegand Hall, Oregon State University, Corvallis, OR 97331-6602, USA.

Journal of Chromatography. A
|July 13, 2005
PubMed
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A new method accurately measures volatile sulfur compounds in wine, crucial for aroma and quality. This technique, using solid-phase microextraction and gas chromatography, detects key compounds at ppb levels.

Area of Science:

  • Analytical Chemistry
  • Food Science
  • Oenology

Background:

  • Volatile sulfur compounds (VSCs) significantly impact wine aroma and quality.
  • Accurate quantification of VSCs is essential for winemaking and quality control.
  • Existing methods may lack sensitivity or the ability to simultaneously analyze multiple VSCs.

Purpose of the Study:

  • To develop and validate a sensitive method for simultaneous quantification of eleven key VSCs in wine.
  • To establish the method's performance characteristics, including linearity, quantification limits, and recovery rates.
  • To apply the developed method for analyzing VSCs in various commercial wine samples.

Main Methods:

  • Solid-phase microextraction (SPME) coupled with gas chromatography-pulsed flame photometric detection (GC-PFPD).

Related Experiment Videos

  • Simultaneous analysis of eleven VSCs using three internal standards.
  • Method validation using calibration curves in synthetic wine and recovery studies in diverse wine matrices.

    • Main Results:

    • Linear correlation coefficients (R2) exceeded 0.99 for all target compounds.
    • Quantification limits were 0.5 ppb or lower for most VSCs, with methionol at 60 ppb.
    • Recoveries greater than 80% were achieved across synthetic and real wine samples (Pinot noir, Cabernet Sauvignon, Pinot Grigio, Chardonnay).
    • Analysis of commercial wines revealed methionol at ppm levels and hydrogen sulfide, methanethiol, and methyl thioacetate at ppb levels; disulfides, trisulfides, and ethanethiol were detected in trace amounts or not at all.

    Conclusions:

    • The developed SPME-GC-PFPD technique provides a sensitive and reliable method for simultaneous VSC quantification in wine.
    • The method demonstrates good performance across different wine matrices, essential for accurate wine analysis.
    • This technique is suitable for routine analysis of VSCs, aiding in wine quality assessment and defect identification.