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Solid-phase microextraction method development for headspace analysis of volatile flavor compounds.

D D Roberts1, P Pollien, C Milo

  • 1Nestlé Research Center, Vers Chez les Blanc, Lausanne, Switzerland.

Journal of Agricultural and Food Chemistry
|July 11, 2000
PubMed
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Solid-phase microextraction (SPME) fiber selection is crucial for accurately analyzing volatile flavor compounds in coffee. Short headspace sampling (1 min) offers reliable relative quantification, while isotope dilution assays ensure accurate absolute quantification.

Area of Science:

  • Analytical Chemistry
  • Food Science
  • Sensory Science

Background:

  • Volatile flavor compounds significantly impact the sensory perception of food and beverages.
  • Accurate quantification of these compounds is essential for quality control and product development.
  • Solid-phase microextraction (SPME) is a widely used technique for analyzing volatile compounds.

Purpose of the Study:

  • To evaluate different SPME fibers for adsorbing volatile flavor compounds from coffee and aqueous solutions.
  • To determine optimal conditions for headspace analysis and quantification of volatile compounds.
  • To compare relative headspace quantification with absolute quantification using isotope dilution assays (IDA).

Main Methods:

  • Evaluation of poly(dimethylsiloxane)/divinylbenzene and Carboxen/poly(dimethylsiloxane) SPME fibers.

Related Experiment Videos

  • Headspace analysis of coffee and flavored aqueous solutions with varying compound concentrations.
  • Short-time headspace sampling (1 min) for improved representation of equilibrium concentrations.
  • Comparison of relative headspace quantification with absolute quantification using isotope dilution assays (IDA).

    • Main Results:

    • Poly(dimethylsiloxane)/divinylbenzene fibers showed highest overall sensitivity; Carboxen/poly(dimethylsiloxane) fibers were most sensitive to small molecules and acids.
    • Competition effects limited the linear range of quantification for some compounds above 1 ppm.
    • A 1-min headspace adsorption time provided reliable relative quantification for coffee brew analysis.
    • IDA provided accurate absolute quantification, unaffected by complex matrices or high compound concentrations, unlike relative methods for acetic acid.

    Conclusions:

    • SPME fiber choice impacts the sensitivity and selectivity of volatile compound analysis.
    • Short-time headspace sampling is suitable for relative quantification of coffee volatiles.
    • IDA is superior to relative headspace methods for absolute quantification, especially in complex matrices or when analyzing acidic compounds.
    • Understanding these analytical nuances is key for accurate flavor profiling and quality assessment.