Bacterial diversity in Korean temple kimchi fermentation.

Area of Science:

• Food Science
• Microbiology
• Fermentation Technology

Background:

• Traditional kimchi production involves salted vegetables and seasonings like garlic, scallion, and fermented seafood (jeotgal).
• Korean temple food offers a vegan alternative, excluding animal products and limiting pungent herbs to garlic, scallion, leek, onions, and chives.
• Understanding the microbial ecology of kimchi variants is crucial for quality and production optimization.

Purpose of the Study:

• To investigate and compare the fermentation characteristics and microbial diversity of traditional Korean temple-style kimchi versus commercial kimchi.
• To identify differences in bacterial communities and their distribution patterns during fermentation based on kimchi type.
• To provide insights into the microbial ecology of kimchi produced without animal-derived ingredients.

Main Methods:

• Analysis of 25 kimchi samples from traditional Korean temples and commercial sources.
• Utilized Illumina MiSeq sequencing for bacterial community profiling.
• Measured initial pH and employed non-metric multidimensional scaling (NMDS) and analysis of similarity (ANOSIM) for microbial community analysis.

Main Results:

• Temple-style kimchi samples exhibited a significantly higher bacterial diversity index compared to commercial samples.
• Distinct microbial communities were observed between temple-style and commercial kimchi, as evidenced by NMDS and ANOSIM.
• Core bacterial genera distribution patterns varied significantly by kimchi type, particularly in the early stages of fermentation.

Conclusions:

• Korean temple-style kimchi possesses a unique microbial ecology, characterized by higher bacterial diversity and distinct community structures.
• The absence of animal products in temple kimchi does not hinder robust fermentation; instead, it shapes a unique microbial profile.
• Findings contribute novel insights into the fermentation dynamics and microbial basis of specialized kimchi varieties, informing future production and quality control.