Related Experiment Video

Updated: Jun 23, 2026

Synthesis of Multi-walled Carbon Nanotubes Modified with Silver Nanoparticles and Evaluation of Their Antibacterial Activities and Cytotoxic Properties
11:19

Synthesis of Multi-walled Carbon Nanotubes Modified with Silver Nanoparticles and Evaluation of Their Antibacterial Activities and Cytotoxic Properties

Published on: May 10, 2018

Eradication of bacteria in suspension and biofilms using methylene blue-loaded dynamic nanoplatforms

Jianfeng Wu1, Hao Xu, Wei Tang

  • 1University of Michigan, Department of Environmental Health Sciences, 109 Observatory St., Ann Arbor, MI 48109, USA.

Antimicrobial Agents and Chemotherapy
|May 6, 2009
PubMed

Insights

This study shows that a dynamic nanoplatform loaded with methylene blue effectively kills various bacteria, including Staphylococcus aureus and E. coli, and inhibits biofilm formation. The nanoplatform demonstrates significant photobactericidal efficacy against bacterial infections.

Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Antimicrobial Research

Background:

  • Dynamic nanoplatforms (DNPs) offer novel therapeutic strategies.
  • Polyacrylamide (PAA) hydrogels can encapsulate photosensitive agents like methylene blue (MB).
  • Previous studies demonstrated MB-PAA-DNPs efficacy against glioma cells.

Purpose of the Study:

  • To evaluate the antibacterial efficacy of MB-PAA-DNPs against common bacterial pathogens.
  • To assess the nanoplatform's effectiveness in inhibiting and eradicating bacterial biofilms.
  • To determine the impact of various parameters on photobactericidal activity.

Main Methods:

  • Exposure of bacterial cultures (Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, Acinetobacter sp.) to activated MB-PAA-DNPs.
  • Assessment of killing efficiency based on nanoparticle concentration, light parameters, and incubation time.
  • Evaluation of biofilm inhibition and eradication on glass and polystyrene surfaces.

Main Results:

  • Activated MB-PAA-DNPs eradicated all tested bacterial species.
  • Encapsulation reduced the dark toxicity of MB.
  • Photobactericidal efficacy was higher against Gram-positive than Gram-negative bacteria.
  • MB-PAA-DNPs inhibited biofilm formation and eradicated early-stage biofilms.

Conclusions:

  • MB-PAA-DNPs are a promising platform for combating bacterial infections and biofilms.
  • The nanoplatform offers a reduced toxicity profile compared to free methylene blue.
  • Targeted photobactericidal activity provides a basis for developing new antimicrobial strategies.

More Related Videos

A Platform of Anti-biofilm Assays Suited to the Exploration of Natural Compound Libraries09:39

A Platform of Anti-biofilm Assays Suited to the Exploration of Natural Compound Libraries

Published on: December 27, 2016

Evaluation of the Efficacy of Organic Peroxyacids for Eradicating Dairy Biofilms Using an Approach Combining Static and Dynamic Methods11:47

Evaluation of the Efficacy of Organic Peroxyacids for Eradicating Dairy Biofilms Using an Approach Combining Static and Dynamic Methods

Published on: December 9, 2022

Related Concept Videos

Biological Methods for Microbial Control01:28

Biological Methods for Microbial Control

Biological agents offer an effective means of controlling microbial growth by leveraging natural processes like predation, competition, and the secretion of antimicrobial substances.Predatory bacteria such as Bdellovibrio species target and kill pathogens like Salmonella and E. coli. They are widely used in poultry farms to control infections. Myxococcus species help combat plant-pathogenic fungi. These naturally occurring predators serve as eco-friendly alternatives to chemical pesticides and...
Biofilms01:29

Biofilms

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...
Microbial Corrosion01:24

Microbial Corrosion

Microbiologically Influenced Corrosion (MIC) is a significant form of material degradation caused by the metabolic activities of microorganisms. This phenomenon poses substantial challenges across various industries, including oil and gas, maritime, and water treatment sectors.MIC occurs when microorganisms, such as bacteria, archaea, and fungi, colonize metal surfaces, forming biofilms that alter the local electrochemical environment. These biofilms can lead to the production of corrosive...
Physical Methods for Controlling Microbial Growth: Radiation and Filtration01:26

Physical Methods for Controlling Microbial Growth: Radiation and Filtration

Radiation and filtration are essential tools for microbial control, targeting microorganisms through distinct mechanisms. Radiation eliminates microbes by damaging their DNA, either killing them or inhibiting their growth. Based on wavelength, radiation is classified into two types: nonionizing and ionizing radiation.Non-ionizing radiation, such as UV radiation (200–400 nm), is absorbed by DNA, causing defects that effectively disinfect surfaces, air, and water, including safety cabinets.