Influence of phospholipid structures on volatile organic compounds generation in model systems
Xueli Chen1, Cong Li1, Jinsong Zhao1
1School of Food and Biological Engineering, Hefei University of Technology, Hefei 230009, Anhui Province, China.
Food Research International (Ottawa, Ont.)
|November 30, 2024
Summary
Oxidation of phospholipids like phosphatidylcholine (PC) and phosphatidylethanolamine (PE) produces aldehydes and ketones. Polyunsaturated fatty acids are more prone to oxidation, with PC (16:0-18:2) showing the highest volatile organic compound generation.
Area of Science:
- Lipidomics
- Oxidation Chemistry
- Analytical Chemistry
Background:
- Phospholipids (PLs), including phosphatidylcholine (PC) and phosphatidylethanolamine (PE), are crucial biological molecules.
- Understanding their oxidation products is vital for food science, nutrition, and health.
- Fatty acid composition and head groups significantly influence PL oxidative stability.
Purpose of the Study:
- To compare oxidation products of PC and PE using gas chromatography-mass spectrometry (GC-MS).
- To investigate how fatty acid variations and head groups affect volatile organic compound (VOC) generation during oxidation.
- To examine the impact of oxidation temperature and time on VOC production.
Main Methods:
- Analysis of oxidation products from PE (16:0-18:2), PC (16:0-18:2), and PC (16:0-18:1) using GC-MS.
- Identification and quantification of generated volatile organic compounds (VOCs).
- Thermogravimetric analysis to assess mass loss during oxidation.
Main Results:
- 42 VOCs were identified, primarily aldehydes and ketones, across the three phospholipids.
- VOC content increased with oxidation temperature and time, peaking at 175 °C for 60 min.
- PC (16:0-18:2) generated the highest total VOCs and exhibited the greatest mass loss, indicating higher susceptibility to oxidation.
Conclusions:
- Polyunsaturated fatty acids are more susceptible to oxidation and degradation.
- The choline head group in PC may lead to lower oxidative stability compared to PE.
- Oxidation conditions (temperature, time) significantly influence the type and quantity of VOCs produced.
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