Study on Maillard reaction mechanism by quantum chemistry calculation.

Area of Science:

• Food Chemistry
• Computational Chemistry
• Chemical Kinetics

Background:

• The Maillard reaction, crucial in food processing, involves amino acids and carbohydrates at high temperatures.
• Limited understanding of Maillard reaction mechanisms hinders comprehension of food browning and flavor development.
• Detailed computational studies are needed to elucidate complex reaction pathways.

Purpose of the Study:

• To computationally investigate the primary and intermediate reaction mechanisms of the Maillard reaction.
• To provide detailed molecular-level insights into the complex pathways involved.
• To identify key factors, such as water catalysis, influencing reaction outcomes.

Main Methods:

• Density Functional Theory (DFT) calculations using the M06-2X/6-311G* method.
• Exploration of reaction mechanisms for a selected model system.
• Analysis of reaction pathways, including enolization and degradation steps.

Main Results:

• Identified Schiff-base formation and Amadori rearrangement as key primary stage steps.
• Investigated two main intermediate stage pathways: 1-2 and 2-3 enolization.
• Confirmed water catalysis is essential across multiple reaction steps, impacting product formation like 5-hydroxymethylfurfural and aldehydes.

Conclusions:

• The study provides a deeper molecular-level understanding of the Maillard reaction.
• Elucidated complex reaction pathways and the critical role of water catalysis.
• Facilitates potential regulation of harmful byproducts in food systems.