“Plug-n-Play” Sensing with Digital Microfluidics

Digital microfluidics (DMF) is a platform that enables highly reconfigurable and automated fluidic operations using a generic device architecture. A unique hallmark of DMF is its “flexibility”: a generic device design can be used and reused for many different, divergent fluidic operations. The flexibility of DMF is compromised when devices are permanently modified with embedded sensors. Here we introduce a solution to the “flexibility gap” between fluidic operations in digital microfluidics and embedded sensors: “plug-n-play DMF” (PnP-DMF). In PnP-DMF, devices are designed to allow for rapid and seamless exchange of sensors depending on the application needs. This paper provides “proof of concept” for PnP-DMF using commercial biosensors for glucose and β-ketone, a custom paper-based electrochemical sensor for lactate, and a generic screen-printed electroanalytical cell. We demonstrate that hot-swapping sensors between experiments allows for convenient implementation of complex processes such as automated ...