If refer to one's usual expiration date printed on the packaging of our products, Chinese researchers have found a way to do things differently in order to check the status of our food.Thanks to nanotechnology, they managed to create a chip that can notify the consumer when a product is damaged. invention that the team of the must Peking University , led by Professor Chao Zhang. This is a tag to be bonded to the packaging of a food package or a medicament. Hardly bigger than a grain of rice, each chip is made from gold nanorods and silver. To control the "consumability" of a food, the small device uses a color code to inform the consumer. Thus, it is red when the content is fresh. It then turns to orange to yellow according to the degradation of the food. Once the green , it indicates that it is outdated . In addition to considering the expiry date of the product, the process is also based on the potential damage caused by the change in ambient temperature. At the prototype stage, this tag feed controller was tested on milk exposed to different temperatures. For now, the process has been patented in China and its designers hope to find a way to make it accessible to a wider public more.
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