Characterization and identification of different Chinese fermented vinegars based on their volatile components

Area of Science:

• Food Chemistry
• Analytical Chemistry
• Biotechnology

Background:

• Traditional Chinese vinegars possess significant cultural and economic value.
• Market adulteration poses a threat to the authenticity and quality of Chinese fermented vinegars.
• Understanding the volatile profiles is crucial for authenticating and ensuring the quality of these products.

Purpose of the Study:

• To identify and characterize the volatile components of diverse Chinese fermented vinegars.
• To develop a robust analytical method for discriminating between different vinegar varieties based on their volatile profiles.
• To establish a strategy for quality monitoring and authentication of traditional Chinese vinegars.

Main Methods:

• Volatile components were extracted using headspace-solid-phase microextraction (HS-SPME).
• Analysis was performed using gas chromatography-mass spectrometry (GC-MS).
• Multivariate statistical methods, including principal component analysis (PCA) and partial least squares-discriminant analysis (PLS-DA), were employed for data analysis and classification.

Main Results:

• Sixty-two aroma compounds were identified, primarily esters, heterocyclics, acids, aldehydes, and ketones.
• PLS-DA models achieved 100% classification accuracy for training sets, effectively grouping samples by origin, raw materials, and processing technology.
• Starter cultures and fermentation processes were identified as the most influential factors on volatile composition.

Conclusions:

• The developed GC-MS and PLS-DA strategy provides a reliable method for identifying Chinese fermented vinegars.
• This approach can be effectively used to detect adulterations and ensure the quality and safety of traditional vinegars.
• The findings contribute to preserving the integrity and market value of traditional Chinese fermented vinegars.