Stability of thiols in an aqueous process flavoring

Area of Science:

• Food Chemistry
• Flavor Science
• Chemical Kinetics

Background:

• Flavor stability is crucial for processed foods, impacting consumer acceptance and product shelf-life.
• Model systems are essential for understanding complex flavor degradation pathways.
• Ribose and cysteine are key precursors in Maillard reactions, contributing significantly to savory flavor profiles.

Purpose of the Study:

• To investigate the stability of specific sulfur-containing flavor compounds in an aqueous ribose-cysteine model system.
• To determine the degradation rates of key flavor components under accelerated storage conditions.
• To elucidate the influence of ribose and cysteine on flavor compound stability.

Main Methods:

• Accelerated storage of a model savory flavor solution (ribose and cysteine) at 50°C.
• Quantification of sulfur-containing flavor compounds using analytical techniques.
• Investigation of degradation kinetics and proposed mechanisms.

Main Results:

• 2-methyl-3-furanthiol exhibited the highest instability, decreasing by 59% per 24 hours.
• 2-furfurylthiol, 2-mercapto-3-butanone, and 2,5-dimethyl-4-hydroxy-3(2H)-furanone showed lower degradation rates.
• Both ribose and cysteine influenced the stability of the analyzed flavor compounds.

Conclusions:

• The stability of sulfur-containing flavor compounds varies significantly, with 2-methyl-3-furanthiol being particularly susceptible to degradation.
• Ribose and cysteine play a role in the instability of these flavor compounds.
• A proposed mechanism for 2-methyl-3-furanthiol instability was supported by experimental evidence.