Acetic Acid Fermentation in Food Systems

Acetic acid fermentation is a critical oxidative process in food production, in which ethanol—typically derived from carbohydrate fermentation—is converted into acetic acid by specialised bacteria under aerobic conditions. This process underpins the manufacture of vinegars, kombucha and other acidic condiments, imparting characteristic flavours, preservation qualities and potential health benefits. Two principal approaches are employed: solid-state fermentation, where microbes colonise moist solids, and submerged or surface fermentation in liquid media, enabling precise control of oxygen transfer and temperature. Beyond acetic acid, these bacteria produce valuable coproducts such as gluconic acid, bacterial cellulose and various volatile compounds. Current research emphasises strain selection, community dynamics and process optimisation to enhance acid yields, sensory profiles and the sustainable utilisation of agro-industrial by-products, while addressing challenges of acid tolerance and starter-culture consistency.

Research from Nature Portfolio

Recent studies have elucidated the functional architecture of microbial communities in traditional vinegar fermentations. Investigations into multispecies solid-state fermentations of aromatic vinegars identified Acetobacter, Lactobacillus and Gluconacetobacter as core genera responsible for the generation of organic acids, amino acids and volatile flavour compounds, with correlation analyses linking community shifts to metabolite emergence. Time-resolved profiling of aged vinegar systems has further delineated distinct stages of acetic acid fermentation, showing an early prevalence of Pantoea and Pediococcus transitioning to dominance by Acetobacter and Komagataeibacter, each stage corresponding to unique organic acid and ester signatures. These findings establish mechanistic frameworks for flavour development and microbial succession in artisanal vinegar production.

Acetic Acid Fermentation in Food Systems publication trend

The graph below shows the total number of articles in acetic acid fermentation in food systems across all publications each year (not limited to Nature Index journals).

Technical terms

Acetic acid fermentation: the aerobic oxidation of ethanol to acetic acid by specialised microorganisms.

Acetic acid bacteria (AAB): a group of obligate aerobic, Gram-negative bacteria that catalyse ethanol oxidation.

Solid-state fermentation: a process occurring on moist solid substrates with minimal free water.

Submerged fermentation: a liquid-based system that allows controlled microbial growth and product formation.

Microbiota succession: the temporal sequence of shifts in microbial community composition during fermentation.

Gluconic acid: an organic acid produced by the oxidation of glucose, with applications in food and bioproducts.

References

1. Oxidative fermentation of glucose and ethanol in designed media and cooked grape must by acetic acid bacteria. Journal of Agriculture and Food Research (2024).
2. Exploring flavour-producing core microbiota in multispecies solid-state fermentation of traditional Chinese vinegar. Scientific Reports (2016).
3. Dynamic microbial succession of Shanxi aged vinegar and its correlation with flavor metabolites during different stages of acetic acid fermentation. Scientific Reports (2018).
4. Classification of acetic acid bacteria and their acid resistant mechanism. AMB Express (2021).
5. Biotechnological Processes in Fruit Vinegar Production. Foods (2021).