Microbial Transformations of Organically Fermented Foods.

Area of Science:

• Microbiology
• Food Science
• Metabolomics

Background:

• Fermented foods, an ancient preservation method, are regaining popularity due to perceived health benefits.
• Western diets have largely abandoned traditional fermentation practices.

Purpose of the Study:

• To analyze the microbiome and metabolome of organically fermented vegetables using a common salt brine method.
• To understand the chemical and microbial transformations during vegetable fermentation.

Main Methods:

• Analysis of the microbiome and metabolome of fermented beets, carrots, peppers, and radishes over a 4-day period.
• Utilized a salt brine for 'at-home' style fermentation.

Main Results:

• Fermentation significantly altered food metabolites, with peak molecular diversity observed at 2-3 days.
• Microbiome shifted from soil-like to Enterobacteriaceae-dominated within one day, followed by increasing Lactobacillales.
• Polyphenols, triterpenoids, and anthocyanins transformed, with changes varying by vegetable type (e.g., increase in beets, decrease in carrots).

Conclusions:

• Organic vegetable fermentation profoundly changes food chemistry and microbiology.
• The process leads to high Enterobacteriaceae abundance, which are not typically considered probiotics.
• The release of beneficial plant specialized metabolites is observed but is dependent on the specific vegetable fermented.