A team led by Anita Shukla at Brown University developed a smart hydrogel wound dressing that releases antibiotics only when infection is present. The hydrogel sits on a wound under a bandage and is made of water and long polymer molecules linked by crosslinkers.
The researchers designed a crosslinker that breaks down when it encounters enzymes called beta-lactamases, which many harmful bacteria produce. When those enzymes are present, the hydrogel degrades and frees the antibiotic; when they are absent, the material keeps the drug trapped.
Laboratory petri dish tests showed enzyme-specific degradation and no release with harmless bacteria. In mice, a single application cleared a bacterial infection in an abrasion wound. The hydrogel also reduced drug leaching and did not promote antibiotic resistance during long-term exposure. The team has patented the material and is working toward further development.
Difficult words
- hydrogel — a soft material made mostly of water
- crosslinker — a molecule that connects polymer chains togethercrosslinkers
- break down — to separate into smaller parts or piecesbreaks down
- enzyme — a protein that speeds up chemical reactionsenzymes
- beta-lactamase — an enzyme many bacteria make that destroys antibioticsbeta-lactamases
- degrade — to become weaker or to be chemically brokendegrades
- antibiotic resistance — when bacteria survive despite antibiotic treatment
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Discussion questions
- Would you prefer a wound dressing that releases antibiotics only when infection appears? Why or why not?
- What are the benefits of reducing drug leaching from a wound dressing?
- What steps do you think the research team should take next to develop this material further?
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