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Biofilms01:29

Biofilms

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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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Related Experiment Video

Updated: Aug 13, 2025

A Semi-quantitative Approach to Assess Biofilm Formation Using Wrinkled Colony Development
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Real-Time Monitoring of Biofilm Formation Using a Noninvasive Impedance-Based Method.

Sriram Kumar1, Anh Tuan Nguyen1, Subir Goswami1

  • 1Department of Chemistry, Oregon State University, Corvallis, OR, USA.

Sensors and Actuators. B, Chemical
|January 23, 2023
PubMed
Summary

A new electrochemical impedance method noninvasively monitors dental plaque biofilm growth in real-time. This technique accurately quantifies biofilm volume on various surfaces, aiding in the evaluation of new antibacterial biomaterials.

Keywords:
Impedance-based sensorbiomaterial substratesmulti-species oral biofilmpH microenvironmentstandardized biofilm volume quantification

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Area of Science:

  • Biomaterials Science
  • Microbiology
  • Electrochemistry

Background:

  • Biofilms are complex microbial communities that pose challenges for real-time monitoring due to their dynamic nature.
  • Quantifying biofilm volume, shape, and features uniformly across different surfaces remains difficult.

Purpose of the Study:

  • To develop a noninvasive electrochemical impedance technique for real-time monitoring of multispecies biofilm growth.
  • To establish a working equation correlating electrochemical impedance to live biofilm volume.
  • To assess the technique's applicability on various substrates like glass, dental filling resin, and Ca2+-releasing resin composites.

Main Methods:

  • Utilized electrochemical impedance spectroscopy to monitor biofilm growth on different substrates.
  • Developed a working equation linking impedance changes to live biofilm volume (μm³/μm²).
  • Employed potentiometry pH microsensors to track local pH variations at biofilm-substrate interfaces.

Main Results:

  • Established a correlation between impedance changes and biofilm volumes.
  • Determined substrate-specific growth rates, with glass, dental filling resin, and Ca2+-releasing composites reaching 50% impedance change in 3.5, 4.5, and 6 days, respectively.
  • Observed pH changes that varied with biofilm volume.

Conclusions:

  • The developed electrochemical impedance technique provides a noninvasive, real-time method for monitoring biofilm growth on diverse surfaces.
  • This approach is valuable for assessing the antibacterial efficacy of novel biomaterials.