Effects of Heating on Virgin Olive Oils and Their Blends: Focus on Modifications of Phenolic Fraction

The phenolic profiles of two different virgin olive oils and their admixtures in different percentages have been analyzed after heating treatments by microwave or conventional oven. Changes in the phenolic profile upon heating were evaluated by chromatographic and spectroscopic methods, also monitor...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 2010-07, Vol.58 (14), p.8158-8166
Main Authors: Valli, Enrico, Bendini, Alessandra, Cerretani, Lorenzo, Fu, Shaoping, Segura-Carretero, Antonio, Cremonini, Mauro Andrea
Format: Article
Language:English
Subjects:
aldehydes
Analytical Methods
antioxidant activity
Antioxidants - analysis
Biological and medical sciences
conventional ovens
elenolic acid
Fat industries
food composition
Food Handling - methods
Food industries
food processing
food processing quality
Fundamental and applied biological sciences. Psychology
heat treatment
Hot Temperature
microwave ovens
microwave treatment
Olive Oil
phenolic compounds
Phenols - analysis
phytochemicals
Plant Oils - chemistry
Pyrans - analysis
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Summary:The phenolic profiles of two different virgin olive oils and their admixtures in different percentages have been analyzed after heating treatments by microwave or conventional oven. Changes in the phenolic profile upon heating were evaluated by chromatographic and spectroscopic methods, also monitoring the antioxidant activity by ABTS•+ test. 3,4-DHPEA-EA, p-HPEA-EA, and EA showed the highest decreases after thermal treatments. The only compounds that showed a clear increase with heating, in particular by conventional oven, were the dialdehydic form of elenolic acid (EDA) and p-hydroxyphenylethanol linked to the dialdehydic form of elenolic acid (p-HPEA-EDA). A comparison between the variations after heating of the sum of monoaldehydic and dialdehydic forms of phenolic compounds obtained by using different analytical approaches (HPLC-DAD/MSD and 1D and 2D NMR spectroscopy) was made. The results showed a good agreement of these two high-resolution techniques.
ISSN:0021-8561
1520-5118
DOI:10.1021/jf1009582