Dextran

Definition

Dextran is a complex branched polysaccharide composed of multiple glucose molecules. It is produced by certain bacteria and plays a key role in dental plaque formation.

5 Must Know Facts For Your Next Test

1. Dextran is synthesized by oral bacteria such as Streptococcus mutans from sucrose.
2. It contributes to the formation of biofilms on teeth, leading to dental plaque.
3. Dental plaque facilitated by dextran can result in tooth decay and gum disease.
4. Dextran's sticky nature helps bacteria adhere to tooth surfaces, protecting them from saliva and other cleaning mechanisms.
5. Enzymes like dextransucrase are involved in converting sucrose into dextran.

Review Questions

• Which oral bacterium is commonly associated with the production of dextran?
• How does dextran contribute to the formation of dental plaque?
• What enzyme converts sucrose into dextran?

Related terms

Streptococcus mutans: A type of bacteria that produces dextran and is a major contributor to tooth decay.

Biofilm: A structured community of microorganisms encased in a self-produced polymeric matrix adhering to surfaces.

Dextransucrase: An enzyme that catalyzes the conversion of sucrose into dextran.