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Review
. 2021 Sep;20(5):4299-4323.
doi: 10.1111/1541-4337.12804. Epub 2021 Aug 6.

Propionic acid bacteria in the food industry: An update on essential traits and detection methods

Carola Bücher  1 , Johanna Burtscher  2 , Konrad J Domig  2
Affiliations
Review

Propionic acid bacteria in the food industry: An update on essential traits and detection methods

Carola Bücher et al. Compr Rev Food Sci Food Saf. 2021 Sep.

Abstract

Propionic acid bacteria (PAB) is an umbrella term for a group of bacteria with the ability to produce propionic acid. In the past, due to this common feature and other phenotypic similarities, genetically heterogeneous bacteria were considered as a single genus, Propionibacterium. Members of this genus ranged from "dairy propionibacteria," which are widely known for their role in eye and flavor formation in cheese production, to "cutaneous propionibacteria," which are primarily associated with human skin. In 2016, the introduction of two new genera based on genotypic data facilitated a clear separation of cutaneous (Cutibacterium spp.) from dairy PAB (Propionibacterium spp., Acidipropionibacterium spp.). In light of these taxonomic changes, but with particular emphasis on dairy PAB, this review describes the current state of knowledge about metabolic pathways and other characteristics such as antibiotic resistance and virulence factors. In addition, the relevance of dairy PAB for the food industry and cheese production in particular is highlighted. Furthermore, methods for cultivation, detection, and enumeration are reviewed, incorporating the current taxonomy as well as the potential for routine applications.

Keywords: Acidipropionibacterium; Propionibacterium; dairy; identification; metabolism.

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