Aragon Researchers Develop Rapid Biosensor for Foodborne Pathogen Detection

A team of Spanish researchers has taken a major step toward preventing foodborne illnesses. Scientists at the Aragón Institute of Nanoscience and Materials (INMA) a collaboration between the Spanish National Research Council (CSIC) and the University of Zaragoza, have developed a portable biosensor that can detect dangerous bacteria in food in just about an hour.

The research, published in the Journal of the American Chemical Society, focuses on Salmonella and Listeria — pathogens responsible for thousands of infections worldwide each year. Unlike traditional lab tests, which can take several days, this new technology delivers rapid results and could dramatically reduce the risk of contaminated food reaching consumers.

Liquid Crystals: From Screens to Food Safety

The breakthrough relies on liquid crystals, materials commonly found in smartphone and TV displays. But instead of producing images, these crystals are being used to sense bacteria. The crystals react to microscopic changes when they come into contact with pathogens, altering their internal structure in a way that can be measured with fluorescence.

We can now see the presence of harmful bacteria almost instantly, without relying on large laboratories or specialized microscopes,” said a lead researcher from INMA. Small droplets of liquid crystals are engineered to recognize specific bacteria, lighting up when they detect a threat. The change is easy to read using portable spectrophotometers, making the system highly practical for real-world food monitoring.

Speed, Accuracy, and Real-World Application

The sensor’s precision is impressive. It can detect bacteria even when only a few cells are present in a sample. And it works reliably under various conditions, making it suitable for food processing plants, distribution centers, or even small-scale producers.

“This technology could be a game-changer for the food industry,” explained a food safety expert. “Rapid detection of Salmonella or Listeria means that contaminated products can be caught before they reach the market, potentially preventing outbreaks.”

A Flexible Platform for Future Pathogens

The INMA team emphasizes that the system is highly adaptable. By modifying the molecular recognition components, the sensor could be used to detect other harmful bacteria or pathogens of public health concern.

With foodborne illnesses continuing to pose major health risks globally, innovations like this offer a practical, fast, and reliable solution. The hope is that, in the near future, inspectors and plant managers won’t have to wait days for lab results — they can identify problems on the spot and take immediate action.