Food microbiology is the study of the microorganisms that inhabit, create, or contaminate food. This includes the study of microorganisms causing food spoilage; pathogens that may cause disease (especially if food is improperly cooked or stored); microbes used to produce fermented foods such as cheese, yogurt, bread, beer, and wine; and microbes with other useful roles, such as producing probiotics.[1][2][3][4]

Subgroups of bacteria that affect food

In the study of bacteria in food, important groups have been subdivided based on certain characteristics. These groupings are not of taxonomic significance:[5]

Food safety

A microbiologist working in a biosafety laboratory tests for high risk pathogens in food

Food safety is a major focus of food microbiology. Numerous agents of disease and pathogens are readily transmitted via food which includes bacteria and viruses. Microbial toxins are also possible contaminants of food; However, microorganisms and their products can also be used to combat these pathogenic microbes. Probiotic bacteria, including those that produce bacteriocins can kill and inhibit pathogens. Alternatively, purified bacteriocins such as nisin can be added directly to food products. Finally, bacteriophages, viruses that only infect bacteria can be used to kill bacterial pathogens.[6] Thorough preparation of food, including proper cooking, eliminates most bacteria and viruses. However, toxins produced by contaminants may not be liable to change to non-toxic forms by heating or cooking the contaminated food due to other safety conditions.[citation needed]


See also: Fermentation in food processing and Yeast in winemaking

Fermentation is one of the methods to preserve food and alter its quality. Yeast, especially Saccharomyces cerevisiae, is used to leaven bread, brew beer and make wine. Certain bacteria, including lactic acid bacteria, are used to make yogurt, cheese, hot sauce, pickles, fermented sausages and dishes such as kimchi. A common effect of these fermentations is that the food product is less hospitable to other microorganisms, including pathogens and spoilage-causing microorganisms, thus extending the food's shelf-life. Some cheese varieties also require molds to ripen and develop their characteristic flavors.[citation needed]

Microbial biopolymers

Several microbially produced biopolymers are used in the food industry.[7]


Alginates can be used as thickening agents.[8] Although listed here under the category 'Microbial polysaccharides', commercial alginates are currently only produced by extraction from brown seaweeds such as Laminaria hyperborea or L. japonica.

Poly-γ-glutamic acid

Poly-γ-glutamic acid (γ-PGA) produced by various strains of Bacillus has potential applications as a thickener in the food industry.[9]

Food testing

Main article: Food sampling

Food microbiology laboratory at the Faculty of Food Technology, Latvia University of Life Sciences and Technologies

To ensure safety of food products, microbiological tests such as testing for pathogens and spoilage organisms are required. This way the risk of contamination under normal use conditions can be examined and food poisoning outbreaks can be prevented. Testing of food products and ingredients is important along the whole supply chain as possible flaws of products can occur at every stage of production.[10] Apart from detecting spoilage, microbiological tests can also determine germ content, identify yeasts and molds, and Salmonella. For Salmonella, scientists are also developing rapid and portable technologies capable of identifying unique variants of Salmonella.[11]

Polymerase chain reaction (PCR) is a quick and inexpensive method to generate numbers of copies of a DNA fragment at a specific band ("PCR (Polymerase Chain Reaction)," 2008). For that reason, scientists are using PCR to detect different kinds of viruses or bacteria, such as HIV and anthrax based on their unique DNA patterns. Various kits are commercially available to help in food pathogen nucleic acids extraction,[12] PCR detection, and differentiation.[13] The detection of bacterial strands in food products is very important to everyone in the world, for it helps prevent the occurrence of food borne illness. Therefore, PCR is recognized as a DNA detector in order to amplify and trace the presence of pathogenic strands in different processed food.[citation needed]

See also


  1. ^ Fratamico PM (2005). Bayles DO (ed.). Foodborne Pathogens: Microbiology and Molecular Biology. Caister Academic Press. ISBN 978-1-904455-00-4.
  2. ^ Tannock GW, ed. (2005). Probiotics and Prebiotics: Scientific Aspects. Caister Academic Press. ISBN 978-1-904455-01-1.
  3. ^ Ljungh A, Wadstrom T, eds. (2009). Lactobacillus Molecular Biology: From Genomics to Probiotics. Caister Academic Press. ISBN 978-1-904455-41-7.
  4. ^ Mayo, B (2010). van Sinderen, D (ed.). Bifidobacteria: Genomics and Molecular Aspects. Caister Academic Press. ISBN 978-1-904455-68-4.
  5. ^ Ray, B. Fundamental Food Microbiology, 3rd Ed. (2005), pp 29-32
  6. ^ Sillankorva, Sanna M.; Oliveira, Hugo; Azeredo, Joana (2012). "Bacteriophages and Their Role in Food Safety". International Journal of Microbiology. 2012: 863945. doi:10.1155/2012/863945. PMC 3536431. PMID 23316235.
  7. ^ Rehm BHA, ed. (2009). Microbial Production of Biopolymers and Polymer Precursors: Applications and Perspectives. Caister Academic Press. ISBN 978-1-904455-36-3.
  8. ^ Remminghorst & Rehm (2009). "Microbial Production of Alginate: Biosynthesis and Applications". Microbial Production of Biopolymers and Polymer Precursors. Caister Academic Press. ISBN 978-1-904455-36-3.
  9. ^ Shih & Wu (2009). "Biosynthesis and Application of Poly(gamma-glutamic acid)". Microbial Production of Biopolymers and Polymer Precursors. Caister Academic Press. ISBN 978-1-904455-36-3.
  10. ^ "Food Testing Laboratories". Archived from the original on 2011-10-20. Retrieved 2012-04-18.
  11. ^ "Rapid Testing and Identification of Salmonella in Foods". Archived from the original on 2022-03-27. Retrieved 2012-04-18.
  12. ^ "FOOD PATHOGEN DNA EXTRACTION filter paper card". Archived from the original on 2021-11-27. Retrieved 2014-07-11.
  13. ^ "Microbial Detection Identification Kits". Archived from the original on 2014-07-15. Retrieved 2014-07-11.