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Rapid Collection of Floral Fragrance Volatiles using a Headspace Volatile Collection Technique for GC-MS Thermal Desorption Sampling
Published on: December 10, 2019
Headspace solid-phase microextraction method for the study of the volatility of selected flavor compounds
1Department of Viticulture and Enology, University of California, One Shields Avenue, Davis 95616, USA.
Journal of Agricultural and Food Chemistry
|December 28, 2002
Summary
Headspace solid-phase microextraction (HS-SPME) with short sampling times accurately measures volatile flavor compounds. This method reveals how food matrix components like proteins and catechins alter flavor compound volatility.
Area of Science:
- Food Chemistry
- Analytical Chemistry
- Sensory Science
Background:
- Understanding flavor volatility is crucial for food product development.
- Nonvolatile food matrix components can influence the release and perception of volatile flavor compounds.
- Accurate measurement of free volatile compounds is essential for studying these interactions.
Purpose of the Study:
- To investigate the impact of nonvolatile food matrix components on the volatility of selected flavor compounds.
- To validate the use of headspace solid-phase microextraction (HS-SPME) for quantifying free volatile compounds in complex matrices.
- To analyze the interactions between specific flavor compounds and food matrix components like beta-lactoglobulin and (+)-catechin.
Main Methods:
- Headspace solid-phase microextraction (HS-SPME) coupled with Gas Chromatography-Mass Spectrometry (GC-MS) for quantification.
- Time-dependent adsorption profiling and partition coefficient determination for volatile compounds.
- Equilibrium dialysis followed by HS-SPME/GC-MS to assess protein-bound volatiles.
- Controlled addition of nonvolatile components (beta-lactoglobulin, (+)-catechin) to flavor mixtures.
Main Results:
- Short sampling times (e.g., 1 min) in HS-SPME accurately reflect equilibrium headspace concentrations, avoiding artifactual extraction of bound volatiles.
- Beta-lactoglobulin significantly decreased the volatility of ethyl hexanoate, heptanone, and hexanal.
- (+)-Catechin reduced the volatility of ethyl hexanoate and hexanal while increasing that of 2-heptanone.
- HS-SPME effectively monitored free volatile compounds in the presence of proteins.
Conclusions:
- HS-SPME is a valuable technique for studying interactions between volatile and nonvolatile food components.
- Careful consideration of kinetic and thermodynamic properties, along with SPME fiber choice, is necessary for accurate analysis.
- Flavor compound volatility is demonstrably affected by interactions with proteins and polyphenols in food matrices.
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