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Virgin olive oil stability study by mesh cell-FTIR spectroscopy.
Noelia Tena1, Ramón Aparicio1, Diego L García-González1
1Instituto de la Grasa (CSIC), Ctra. de Utrera, km. 1, Campus Universitario Pablo de Olavide - Building 46, 41013 Seville, Spain.
Talanta
|March 26, 2017
Summary
This study introduces a mesh cell accessory for Fourier transform infrared (FTIR) spectroscopy to assess virgin olive oil (VOO) stability. This rapid method monitors oxidation under moderate temperature and light, offering insights into oil quality and handling.
Area of Science:
- Food Science
- Analytical Chemistry
- Spectroscopy
Background:
- Oxidation significantly impacts virgin olive oil (VOO) quality and shelf life.
- Traditional methods for assessing oil stability often require accelerated, high-temperature conditions.
- Monitoring chemical changes under realistic storage conditions is crucial for VOO quality control.
Purpose of the Study:
- To evaluate the utility of a mesh cell accessory with Fourier transform infrared (FTIR) spectroscopy for assessing VOO stability.
- To investigate the effects of moderate temperatures and light intensities on VOO oxidation.
- To compare the mesh cell-FTIR method with conventional oil stability assessment techniques.
Main Methods:
- Virgin olive oils (VOOs) were stored in mesh cells at various temperatures (23, 35, 65°C) and light intensities (400, 1000, 7000lx).
- Fourier transform infrared (FTIR) spectroscopy was employed to monitor chemical changes, including hydroperoxide, alcohol, and aldehyde formation.
- Oil stability determined by mesh cell-FTIR was compared against results from standard methods like Rancimat.
Main Results:
- Mesh cell-FTIR successfully detected primary (hydroperoxides) and secondary (alcohols, aldehydes) oxidation products under moderate conditions.
- The method differentiated oil stability based on combined temperature and light exposure, reflecting real-world storage scenarios.
- Results showed good correlation with conventional methods, demonstrating the mesh cell-FTIR's potential.
Conclusions:
- The mesh cell-FTIR method provides a rapid and effective tool for assessing VOO stability under realistic storage and transport conditions.
- This approach allows for a multi-factor evaluation of oil quality, considering temperature and light effects.
- Findings can inform optimized handling, packaging, and storage strategies to maintain VOO quality throughout its shelf life.
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