Antibacterial Coatings for Biomedical Applications

Biomedical devices and implants revolutionise patient care but are susceptible to bacterial colonisation and biofilm formation, leading to persistent infections and device failure. Antibacterial coatings create a protective interface between device surfaces and microbial threats, employing contact-active surfaces, release-based biocides and stimuli-responsive systems to prevent adhesion, inhibit biofilm development and eradicate pathogens. Advances integrate multifunctional strategies—combining antifouling layers to resist initial adhesion, tethered antimicrobial polymers for contact killing, and nanostructured topographies to disrupt bacterial membranes—without compromising biocompatibility or mechanical integrity. Recent efforts have focused on durable, substrate-independent coatings capable of adapting to complex geometries and physiological environments, while minimising the development of microbial resistance. Such innovations hold promise across a spectrum of applications, from intravascular catheters and orthopaedic implants to dental devices and wound dressings, underlining their global significance in reducing healthcare-associated infections and improving patient outcomes.

Research from Nature Portfolio

A multifunctional coating assembled from heparin sodium and organosilicon quaternary ammonium surfactants has been shown to form robust, long-lasting layers on various catheter materials through a simple dipping process. In vivo and ex vivo studies demonstrate over 97 % broad-spectrum antibacterial activity alongside a 60 % reduction in thrombus adhesion, offering simultaneous antithrombosis and antibacterial infection control. Another study explored a silane-based quaternary ammonium coating applied to dentine surfaces, which disrupts bacterial membranes and biofilm architecture, effectively eliminating pathogenic oral species without adverse effects on surrounding tissues. Clinical evaluation of an acrylic resin containing quaternary ammonium methacryloxy silicate revealed significant in vivo plaque inhibition, with experimental materials achieving a tenfold increase in bacterial kill rate compared to controls after intraoral exposure, validating contact-killing efficacy in a physiological setting.

Antibacterial Coatings for Biomedical Applications publication trend

The graph below shows the total number of articles in antibacterial coatings for biomedical applications across all publications each year (not limited to Nature Index journals).

Technical terms

Biofilm: A structured community of bacteria embedded in a self-produced polymeric matrix attached to a surface.

Contact-active coating: A surface with immobilised antimicrobial agents that kill bacteria upon physical contact.

Antifouling: Property of a surface designed to resist adhesion of proteins, cells or microorganisms.

Stimuli-responsive material: A coating that changes its properties or releases agents in response to environmental cues.

Quaternary ammonium compound: A cationic surfactant with potent antimicrobial activity used in contact-killing surfaces.

References

1. Surface Design for Antibacterial Materials: From Fundamentals to Advanced Strategies. Advanced Science (2021).
2. Heparin-network-mediated long-lasting coatings on intravascular catheters for adaptive antithrombosis and antibacterial infection. Nature Communications (2024).
3. A quaternary ammonium silane antimicrobial triggers bacterial membrane and biofilm destruction. Scientific Reports (2020).
4. Antimicrobial activity of a quaternary ammonium methacryloxy silicate-containing acrylic resin: a randomised clinical trial. Scientific Reports (2016).
5. Stimuli‐Responsive Antibacterial Materials: Molecular Structures, Design Principles, and Biomedical Applications. Advanced Science (2022).
6. Strategies applied to modify structured and smooth surfaces: A step closer to reduce bacterial adhesion and biofilm formation. Colloids and Interface Science Communications (2022).
7. Antimicrobial Polymers in Solution and on Surfaces: Overview and Functional Principles. Polymers (2012).