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Implementing Dynamic Headspace With SPME Sampling of Virgin Olive Oil Volatiles: Optimization, Quality Analytical
Celia Oliver-Pozo1, Dimitrios Trypidis1,2, Ramón Aparicio1
1Instituto de la Grasa (CSIC) , Campus Universidad Pablo de Olavide , Edificio 46, Ctra. de Utrera, km. 1 , 41013 Sevilla , Spain.
Journal of Agricultural and Food Chemistry
|January 24, 2019
Summary
Dynamic headspace sampling (DHS) improves quantification of virgin olive oil volatiles compared to static headspace (SHS). This new method offers better precision and sensitivity for analyzing volatile compounds, aiding in oil quality classification.
Area of Science:
- Analytical Chemistry
- Food Chemistry
- Chromatography
Background:
- Static headspace sampling (SHS) faces challenges in accurately quantifying volatile compounds in virgin olive oil due to competition and interaction phenomena during adsorption.
- Solid phase microextraction (SPME) fibers are effective for trapping volatiles, but their application in SHS for complex matrices like olive oil requires optimization.
Purpose of the Study:
- To develop and optimize a dynamic headspace sampling (DHS) procedure for enhanced quantification of volatile compounds in virgin olive oil.
- To compare the analytical performance of the new DHS method with the conventional SHS method.
- To evaluate the utility of the DHS method for classifying virgin olive oil based on its volatile profile.
Main Methods:
- A novel dynamic headspace sampling (DHS) device was employed for volatile compound concentration.
- A central composite experimental design was used to optimize key DHS parameters: sample weight (4 g), temperature (40 °C), flow rate (150 mL/min), and adsorption time (50 min).
- Analytical quality control parameters (repeatability, LOD, LOQ, working range, sensitivity, resolution) were assessed and compared between DHS and SHS.
Main Results:
- The optimized DHS method demonstrated superior precision for aldehydes and alcohols compared to SHS.
- DHS enabled the analysis of higher volatile compound concentrations without saturation issues.
- Chromatographic peak areas for 19 out of 28 analyzed compounds were significantly higher using DHS.
- The study discusses the concentration values of volatile compounds obtained by both methods and their impact on oil classification.
Conclusions:
- Dynamic headspace sampling (DHS) offers improved analytical performance for quantifying virgin olive oil volatiles over static headspace (SHS).
- The enhanced precision and sensitivity of DHS facilitate more accurate analysis and potential for robust classification of virgin olive oil categories (extra virgin, virgin, lampante).
- The developed DHS method shows promise for routine quality control and authentication of virgin olive oil.
Keywords:
dynamic headspacegas chromatographyinternal quality controlsolid phase microextractionvirgin olive oilvolatile compoundsMore Related Videos
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