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Related Concept Videos

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Biofilms are complex communities of microorganisms encased in a self-produced extracellular polysaccharide matrix attached to surfaces. These microbial consortia can include single or multiple species, providing enhanced survival benefits by forming organized, multilayered structures.The formation of biofilms occurs through four key stages: attachment, colonization, development, and dispersal.During attachment, free-swimming planktonic cells adhere to a surface, often facilitated by...
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The minerals contained in all of the food we consume are essential for our organ systems. However, certain essential minerals, such as calcium, phosphorus, magnesium, manganese, and fluoride, largely affect bone health.
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Related Experiment Video

Updated: Nov 11, 2025

Purification of a High Molecular Mass Protein in Streptococcus mutans
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Fluoride Binding to Streptococcus mutans Pellets Rich in Extracellular Polysaccharides.

Leonardo Libardi Pagotto1, Manuela da Silva Spinola2, Diego Figueiredo Nóbrega3

  • 1Department of Biosciences, Piracicaba Dental School, University of Campinas, São Paulo, Brazil.

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|March 29, 2021
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Extracellular polysaccharides (EPS) in dental biofilm do not impact fluoride binding or retention. This suggests that EPS-rich biofilms do not hinder fluoride

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Area of Science:

  • Oral microbiology
  • Dental caries research
  • Fluoride chemistry

Background:

  • Extracellular polysaccharides (EPS) contribute to dental biofilm cariogenicity.
  • The effect of EPS on fluoride binding and retention in dental biofilms is not well understood.

Purpose of the Study:

  • To investigate the influence of extracellular polysaccharides (EPS) on fluoride binding and retention in Streptococcus mutans biofilms.
  • To determine if EPS-rich dental biofilms affect the efficacy of fluoride in caries prevention.

Main Methods:

  • Formation of EPS-rich (EPS+) and EPS-poor (EPS-) Streptococcus mutans pellets.
  • Treatment of pellets with varying fluoride concentrations (0, 0.1, 1, and 10 mM).
  • Quantification of fluoride binding and retention in the presence and absence of EPS.

Main Results:

  • Fluoride binding to Streptococcus mutans pellets was concentration-dependent.
  • The presence of extracellular polysaccharides (EPS) did not significantly alter fluoride binding.
  • Extracellular polysaccharides (EPS) did not affect the retention of fluoride within the pellets.

Conclusions:

  • Dental biofilm matrices rich in extracellular polysaccharides (EPS) do not impede fluoride retention.
  • The findings suggest that EPS does not interfere with the mechanism of fluoride action in preventing dental caries.