Purdue researchers debut portable on-site E. coli testing

Foodborne illness hits about one in six people in the United States every year. The Centers for Disease Control and Prevention estimates that 48 million people in the US get sick due to one or more of 31 recognized pathogens, including E. coli O157:H7, a particularly harsh strain of E. coli.

Researchers at Purdue University have been working to develop new technologies to help stop the spread of foodborne illnesses, which kill 3,000 people a year, by detecting them more efficiently. They have developed a bioluminescence-based assay coupled with a portable device that works with smartphones and laptops to do on-site testing for harmful E. coli in food samples.

The silicon photomultiplier (SiPM) device uses low light to from the bioluminescent assay to detect the presence of bacteria that cause foodborne illness in food samples. The Purdue team also created an electrical circuit with an amplifier, comparator and micro controller to send the data to laptops and smartphones via Bluetooth technology. They used 3D printing to design a portable cradle for the SiPM. The research is published in the January edition of Applied Optics.

“Our goal is to create technology and a process that allows for the cost-effective detection of the causes of foodborne illness using an easy, expedient and efficient process,” said Euiwon Bae, a senior research scientist of mechanical engineering in Purdue’s College of Engineering, who developed the technology along with Bruce Applegate, a professor of food science in Purdue’s College of Agriculture. “This time frame allows for better integrated detection and quicker action to stop more people from getting sick.”

The U.S. Department of Agriculture Agricultural Research Service (ARS) and Center for Food Safety Engineering (CFSE) provided funding for the technology research in addition to Hatch Funds, which support agricultural research at land-grant institutions across the U.S.