Microbial Nutrients Key to Antibiotic Success

Experiments reveal how nutrient availability impacts antibiotic efficacy against bacterial communities.

Published on Feb. 25, 2026

Got story updates? Submit your updates here. ›

Scientists at Caltech and Princeton University have discovered that microbial nutrients, such as glucose, play a crucial role in the efficacy of antibiotics. By studying antibiotic and bacterial interactions in environments resembling those found in the body, they have revealed that antibiotics that work well in laboratory tests often fail against real infections in humans due to a "nutrient bottleneck" that allows resistant subpopulations to regrow. Their findings provide a framework for developing new antibiotics and investigating resistance.

Why it matters

Antibiotic resistance is a major global health issue, rendering existing treatments ineffective against deadly bacterial infections. This research sheds light on why some antibiotics fail in real-world conditions and offers new directions for designing more successful antibiotic therapies.

The details

The researchers created an experimental setup to mimic the spatially structured, non-mixed bacterial communities found in the human body. They observed that without nutrients, antibiotics had no effect on the bacteria. But when nutrients were added, a "wave of death" swept through the population as the antibiotics killed the metabolically active surface cells. However, they also found that excess nutrients can promote the regrowth of resistant subpopulations that survive the initial antibiotic exposure. The team developed a mathematical model to capture these dynamics and help predict antibiotic efficacy and resistance.

  • The study was published on February 25, 2026.

The players

Sujit Datta

Professor of chemical engineering, bioengineering, and biophysics at Caltech.

Anna Hancock

Postdoctoral scholar in Sujit Datta's research group.

Arabella S. Dill-Macky

Co-author of the study from Princeton University.

Jenna A. Moore

Co-author of the study from Princeton University.

Catherine Day

Co-author of the study from Princeton University.

Mohamed S. Donia

Co-author of the study from Princeton University.

Got photos? Submit your photos here. ›

What they’re saying

“We know that antimicrobial resistance against antibiotics is one of the biggest health issues of our time. Our experiments have revealed antibiotic 'death fronts' that kill cells progressively rather than uniformly-with metabolically active surface cells dying while nutrient-starved interior cells survive.”

— Sujit Datta, Professor of chemical engineering, bioengineering, and biophysics at Caltech (Mirage News)

What’s next

The researchers say their findings won't immediately lead to new and better antibiotics, but the work provides an important starting point for predicting which antibiotics will succeed in the human body and for investigating antibiotic resistance using a different approach.

The takeaway

This study offers a new framework for understanding why some antibiotics fail in real-world conditions and opens up new avenues for developing more effective antibiotic therapies to combat the growing threat of antimicrobial resistance.