Related Experiment Video
Updated: Jan 9, 2026
High-throughput Identification of Bacteria Repellent Polymers for Medical Devices
Published on: November 5, 2016
Polydopamine-Antibiotic Composite Coating for Antibiofilm Applications
Gillian A Kropp1, Hannah Q Karp2, Jayasimha Rao2,3,4,5
1Department of Chemistry, Virginia Tech, Blacksburg, Virginia, USA.
Abstract:
Urinary catheterization is a common procedure, affecting 15%-25% of hospitalized patients. This procedure, however, often results in bacterial infections, primarily caused by biofilm-forming Gram-negative bacteria that adhere to the catheter surface. To address this challenge, we developed a polymer-based antimicrobial coating using polydopamine (PD) embedded with gentamicin (Gent). We evaluated the antibiofilm efficacy of this coating (PD-Gent) using a biofilm-forming isolate of Pseudomonas aeruginosa (PAO1) as P. aeruginosa is commonly implicated in catheter-related infections. We observed that the PD-Gent coating significantly reduced biofilm formed by PAO1 compared to the uncoated control. Importantly, the coating maintained its antibiofilm activity across diverse substrates, including polystyrene, poly(vinyl chloride), and silicone. The approach was further extended to incorporate other antibiotics (tobramycin, amikacin), demonstrating adaptability to multiple antimicrobial agents. Finally, artificial urine inoculated with PAO1 was deployed through PD-Gent-coated silicone Foley catheters under continuous flow for 24 h. Despite this continuous introduction of PAO1, the coated catheters inhibited biofilm formation by three-fold compared to the uncoated control catheters. These findings underscore the promise of PD-Gent as a robust, versatile coating with strong potential to significantly reduce the incidence of catheter-associated infections in clinical settings.
Insights
A new polymer coating embedded with gentamicin significantly reduces biofilm formation on urinary catheters. This polydopamine-gentamicin (PD-Gent) coating shows promise in preventing catheter-associated infections.
Area of Science:
- Biomaterials Science
- Infectious Diseases
- Polymer Chemistry
Background:
- Urinary catheterization affects 15-25% of hospitalized patients.
- Catheter-associated infections are often caused by biofilm-forming Gram-negative bacteria.
- Current solutions for preventing these infections are limited.
Purpose of the Study:
- To develop and evaluate a novel polymer-based antimicrobial coating for urinary catheters.
- To assess the antibiofilm efficacy of a polydopamine-gentamicin (PD-Gent) coating against Pseudomonas aeruginosa.
- To determine the coating's versatility across different substrates and antimicrobial agents.
Main Methods:
- A polymer coating (polydopamine) was embedded with gentamicin (PD-Gent).
- The antibiofilm efficacy of PD-Gent was tested against Pseudomonas aeruginosa (PAO1) on various substrates.
- PD-Gent coated silicone Foley catheters were challenged with PAO1 in artificial urine under continuous flow.
Main Results:
- The PD-Gent coating significantly reduced PAO1 biofilm formation compared to uncoated controls.
- The coating demonstrated consistent antibiofilm activity on polystyrene, PVC, and silicone.
- PD-Gent coated Foley catheters inhibited biofilm formation by three-fold under continuous flow conditions.
Conclusions:
- The PD-Gent coating is a promising strategy for reducing catheter-associated infections.
- The coating is versatile, adaptable to different substrates and antibiotics.
- This technology has strong potential for clinical application in preventing biofilm-related complications.
Related Concept Videos
01:29Biofilms
01:05Bioavailability Enhancement: Drug Stability Enhancement and GI Retention
01:27Combined Effects of Drugs: Synergism
Such synergistic combinations...