Biomedical engineers from Brown University have developed an innovative wound dressing that releases antibiotic drugs only when harmful bacteria are present. The technology could help clear infections more effectively while reducing unnecessary antibiotic use—one of the key drivers of antimicrobial resistance.
The findings, published in Science Advances, demonstrate that the new material can accelerate wound healing while limiting exposure to antibiotics. This approach may help address the growing global threat of antibiotic-resistant “superbug” infections, which claim tens of thousands of lives each year.
A Smart Hydrogel for Targeted Drug Delivery
The researchers created a smart hydrogel loaded with antibiotics that can be applied directly to wounds under a standard bandage. Unlike conventional dressings that release medication continuously, this hydrogel responds specifically to bacterial activity.
The material detects enzymes produced by harmful bacteria. When these enzymes appear, the hydrogel begins to break down and releases the antibiotic drugs stored inside. However, if no harmful bacteria are present, the hydrogel remains intact and keeps the antibiotics safely contained.
According to Anita Shukla, professor at Brown University’s School of Engineering and lead researcher on the project, this targeted approach could significantly improve antibiotic use.
“Antimicrobial resistance is a major problem worldwide, so we need better strategies for how we use antibiotics,” Shukla explained. “Our material releases antibiotics only when harmful bacteria are present, which limits unnecessary exposure while still delivering treatment when needed.”
Enzyme-Triggered Response to Harmful Bacteria
To enable this selective response, the researchers designed the hydrogel to react to enzymes called beta-lactamases. Many bacteria responsible for wound infections produce these enzymes.
Hydrogels are soft, jelly-like materials made primarily of water and long polymer chains. These polymers are connected by smaller molecules known as crosslinkers, which maintain the structure of the gel.
In this new material, the researchers used a crosslinker that breaks down when it encounters beta-lactamase enzymes. Once the crosslinker degrades, the hydrogel structure collapses and releases the antibiotic medication stored inside.
Laboratory Tests Confirm Selective Activation
As reported by medicalxpress, the research team conducted a series of laboratory experiments to test the material’s selectivity. In petri dish studies, the hydrogel degraded only when harmful bacteria that produce beta-lactamases were present.
In contrast, when harmless bacteria that do not produce these enzymes were introduced, the hydrogel remained intact. As a result, the material did not release antibiotics or contribute to antibiotic resistance during long-term exposure.
This selectivity is particularly important because it prevents unnecessary antibiotic exposure to beneficial skin microbes, preserving the natural microbiome.
Stable Drug Formulation Ensures Controlled Release
The study also demonstrated that the hydrogel maintains strong stability before activation. Until bacterial enzymes trigger degradation, the material securely holds its antibiotic payload.
“This formulation is highly stable and does not allow the drug to leak out prematurely,” Shukla noted. “The antibiotic remains trapped until significant beta-lactamase activity causes the hydrogel to degrade.”
Promising Results in Animal Studies
The researchers also tested the hydrogel in mouse models. In these experiments, a single application of the dressing completely eliminated bacterial infections in abrasion wounds.
Moreover, the smart hydrogel outperformed a commonly used antimicrobial wound dressing in both bacterial eradication and wound healing outcomes.
Potential Tool in the Fight Against Antibiotic Resistance
The findings highlight the potential of enzyme-responsive hydrogels to provide targeted infection treatment while conserving vital antibiotics. According to global estimates, more than one million people die each year from infections caused by antibiotic-resistant bacteria.
Experts warn that, without interventions to reduce antibiotic misuse, antimicrobial resistance could lead to nearly 10 million deaths annually by 2050.
The researchers believe their technology could play a role in addressing this challenge. By releasing antibiotics only when infection-causing bacteria are present, the system minimizes unnecessary drug exposure while delivering effective treatment.
Path Toward Future Commercialisation
The research team has already patented the new hydrogel material and is working to advance the technology toward clinical applications. Further studies and development will focus on refining the system and preparing it for potential commercial use in the future.
If successfully translated into clinical practice, the smart dressing could offer a powerful new approach to managing wound infections while helping preserve the effectiveness of critical antibiotics.