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Lipid-derived aldehyde degradation under thermal conditions
Rosario Zamora1, José L Navarro1, Isabel Aguilar1
1Instituto de la Grasa, Consejo Superior de Investigaciones Científicas, Avenida Padre García Tejero 4, 41012 Seville, Spain.
Food Chemistry
|December 23, 2014
Summary
Reactive carbonyls impact food quality. This study reveals thermal degradation of alkenals and alkadienals produces various aldehydes, impacting nucleophile/aldehyde reactions and food safety.
Area of Science:
- Food Chemistry
- Organic Chemistry
- Chemical Kinetics
Background:
- Nucleophilic degradation by reactive carbonyls is crucial for food quality and safety.
- These reactions are complex due to competing reaction pathways involving reactive carbonyls.
Purpose of the Study:
- To investigate the thermal degradation of 2-alkenals and 2,4-alkadienals.
- To clarify aldehyde stability and identify new compounds involved in nucleophile/aldehyde reactions.
Main Methods:
- Thermal degradation experiments were conducted on 2-pentenal, 2-octenal, 2,4-heptadienal, and 2,4-decadienal.
- Analysis of degradation products including formaldehyde, acetaldehyde, and various alkanals and alkenals.
Main Results:
- Alkenals and alkadienals rapidly decomposed under buffer and air conditions.
- Degradation produced formaldehyde, acetaldehyde, propanal, hexanal, glyoxal, and fumaraldehyde.
- Double bond breakage had low activation energy (∼25 kJ/mol), with higher yields for alkanals (10-18%) than 2-alkenals (∼1%).
Conclusions:
- The thermal degradation pathways of these aldehydes are significant.
- Understanding these reactions is essential for predicting nucleophile/aldehyde adducts in food systems.
- These findings contribute to food safety by elucidating degradation mechanisms.
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