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Related Concept Videos

Antimicrobial Proteins01:23

Antimicrobial Proteins

Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
Interferons
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Surface Membrane Barriers01:18

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Biofilms01:29

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Cellular Membranes and Drug Transport01:24

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Outer Layers of the Cell Envelope01:18

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The outermost layers of prokaryotic cells play a critical role in their survival, virulence, and interaction with the environment. These layers, often composed of polysaccharides, polypeptides, or proteins, form protective and adhesive structures that vary in organization and function.Capsules and Slime LayersCapsules are highly organized, tightly bound layers that firmly attach to the bacterial cell wall. Capsules are usually made of polysaccharides, though some are made of polypeptides. These...
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Updated: Jun 24, 2026

High-throughput Identification of Bacteria Repellent Polymers for Medical Devices
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Published on: November 5, 2016

Polyelectrolyte multilayers with intrinsic antimicrobial functionality: the importance of mobile polycations.

Jenny A Lichter1, Michael F Rubner

  • 1Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 26, 2009
PubMed
Summary

Antimicrobial surfaces can be created using cationic contact-killing strategies. Researchers developed pH-responsive polyelectrolyte multilayers (PEMs) that kill bacteria by exposing cationic charges, offering tunable antimicrobial properties without biocides.

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Assembly and Characterization of Polyelectrolyte Complex Micelles
08:44

Assembly and Characterization of Polyelectrolyte Complex Micelles

Published on: March 2, 2020

Area of Science:

  • Materials Science
  • Surface Chemistry
  • Biotechnology

Background:

  • Cationic contact-killing is crucial for antimicrobial surfaces, preventing bacterial attachment.
  • Highly swollen, compliant surfaces and mobile cationic charge disrupt bacterial cell membranes.
  • Polyelectrolyte multilayers (PEMs) are used for surface modification and can incorporate biocides for antimicrobial effects.

Purpose of the Study:

  • To develop antimicrobial polyelectrolyte multilayers (PEMs) by manipulating assembly and postassembly conditions to expose mobile cationic charge.
  • To create tunable antimicrobial surfaces without relying on specific biocidal species.
  • To investigate the pH-dependent antimicrobial functionality of PEMs.

Main Methods:

  • Assembled poly(allylamine hydrochloride) (PAH) and poly(sodium 4-styrene sulfonate) (SPS) PEMs at high pH, followed by immersion in low pH solutions.
  • Investigated the reversible pH-dependent swelling transition of the PEMs.
  • Tested antimicrobial efficacy against Gram-positive Staphylococcus epidermidis and Gram-negative Escherichia coli strains using airborne and waterborne assays.

Main Results:

  • SPS/PAH multilayers displayed accessible cationic charge, leading to effective bacterial viability reduction.
  • Antimicrobial functionality was demonstrated to be switchable (on/off) via pH treatment.
  • Generalizability of the approach was shown by modifying poly(acrylic acid) (PAA)/PAH PEMs.

Conclusions:

  • Manipulation of PEM assembly and pH conditions can create effective antimicrobial surfaces.
  • Tunable, biocide-free antimicrobial properties can be achieved through controlled exposure of cationic charges.
  • This strategy offers a promising approach for developing advanced antimicrobial materials.