Extracellular polymeric substances (EPS)

Definition

Extracellular polymeric substances (EPS) are a complex mixture of polymers secreted by microorganisms into their environment. EPS form a protective and adhesive matrix that supports biofilm structure and function.

5 Must Know Facts For Your Next Test

1. EPS primarily consist of polysaccharides, proteins, lipids, and nucleic acids.
2. They provide structural integrity and protection to microbial biofilms.
3. EPS play a crucial role in the adhesion of microbes to surfaces and each other.
4. They help retain water and trap nutrients within the biofilm, facilitating microbial growth.
5. EPS can protect microorganisms from environmental stressors such as antibiotics and desiccation.

Review Questions

• What are the main components of extracellular polymeric substances (EPS)?
• How do EPS contribute to the structural integrity of biofilms?
• In what ways do EPS protect microorganisms within a biofilm?

Related terms

Biofilm: A structured community of microbial cells enclosed in a self-produced polymeric matrix attached to an inert or living surface.

Polysaccharide: A carbohydrate molecule composed of long chains of monosaccharide units bound together by glycosidic linkages.

Microbial adhesion: The process by which microorganisms attach themselves to surfaces.