Vintage authentication technology for aged Baijiu: Acid-ester equilibrium

Area of Science:

• Food Chemistry
• Analytical Chemistry
• Chemical Thermodynamics

Background:

• Baijiu (Chinese liquor) authentication is crucial for quality control and preventing fraud.
• Traditional methods for vintage authentication are often subjective or lack precision.
• Understanding the chemical changes during Baijiu aging is key to developing objective methods.

Purpose of the Study:

• To investigate a novel Baijiu vintage authentication technology based on the acid-ester equilibrium principle.
• To analyze the technical foundation, application outcomes, and advantages of this method.
• To establish an objective and accurate method for evaluating Baijiu aging status.

Main Methods:

• Investigated the Baijiu aging process as a dynamic acid-ester equilibrium system.
• Measured the reaction quotient (Q) of ester compounds in Baijiu.
• Compared the reaction quotient (Q) with the stabilizing equilibrium constant (K) to assess aging.

Main Results:

• The aging of Baijiu follows a consistent acid-ester equilibrium evolution pattern across different aroma types and alcohol concentrations.
• The equilibrium constant (K) stabilizes as Baijiu ages, indicating a thermodynamic equilibrium.
• The technology demonstrated strong universality and accurately categorized Baijiu into different vintage ranges in test cases.

Conclusions:

• Baijiu vintage authentication can be objectively and accurately achieved by measuring and comparing the reaction quotient (Q) and equilibrium constant (K) of acid-ester compounds.
• The developed vintage prediction tool, based on acid-ester equilibrium, has practical application value for authenticating Baijiu.
• This acid-ester equilibrium principle provides a robust foundation for Baijiu vintage authentication across diverse Baijiu varieties.