How to evaluate purchased products for contamination by harmful bacteria? In the near future, an inexpensive smartphone device will appear for this, which will give it the ability to detect these bacteria. The development of the gadget involved scientists at Amherst University in Massachusetts. The research team is led by food expert Dr. Lily Hee. Scientists have already developed a chip containing 3-MBPA acid molecules, which, like a magnet, attract bacteria. The chip is immersed in the test product, after which it is washed with a concentrated buffer liquid, which washes away the sugar, fats and proteins contained in the product, while leaving all the bacteria in place. Then the chip is placed in a simple light microscope, designed to work with smartphones. A special application counts the number of bacteria on a chip. The device is very sensitive and can detect even a small number of bacterial cells, for example, 100 units per 1 milliliter of solution.