What the scientists have created is a patch of specially-treated non-toxic transparent polymer film that could be incorporated into food packaging.
Called Sentinel Wrap, it's coated on one side with a microarray of droplets of DNA molecules known as DNAzymes. When pathogens such as E. coli come into contact with them, those DNAzymes fluoresce. Using an app on a smartphone or other mobile device, users could "read" that fluorescence to determine if the food inside the wrap was spoiled.
The scientists believe that mass production of the patch should be relatively cheap and simple, as the DNAzymes are simply inkjet-printed onto the polymer. Additionally, the technology could conceivably be applied to bandages that indicate if wounds are infected, or to wraps for surgical instruments that indicate if they're not sterile.
The research, which was led by Filipe and assistant professor Tohid Didar, is described in a paper recently published in the journal ACS Nano.
For examples of other approaches to food packaging that indicates the freshness of its contents, check out what's been done at the University of Strathclyde and Fraunhofer.
According to newatlas
Van Nguyen (collect ) - WORLD RECORDS UNION - WORLDKINGS ( source of photo : internet )