https://www.sciencedaily.com/releases/2023/02/230201102842.htm

Scientists working with samples containing pathogens need to work with the smallest amounts possible to avoid accidental infection. And for highly contagious bacterial diseases, on-site sample analysis is ideal for rapid diagnoses. In addition, scientists who have visual or other physical impairments may find it difficult to operate complex instruments, especially those designed for tiny volumes. Hands-free devices that operate quickly through voice commands could make this process easier and safer. So, Tae Seok Seo and colleagues wanted to combine a speech recognition app with a miniaturized extraction system to do just that.

The researchers first made a microfluidic chip with multiple chambers linked together by six 3-way solenoid valves, which were operated by a micro-controller connected to a Bluetooth module. The palm-sized device weighed only 11 ounces and could be powered by a portable battery or a 5V smartphone charger. Then, using existing speech recognition software, the team customized a smartphone app to listen for specific voice commands. Here’s how it works: