A process for extracting a solute from an analyte-containing fluid phase. The process includes passing the analyte-containing fluid phase along a first fluid microchannel of a microfluidic extraction device and passing an extractant fluid phase that is at least partially immiscible with the analyte-containing fluid phase along a second fluid microchannel of the microfluidic extraction device. The analyte-containing fluid phase and the extractant fluid phase contact one another at a contact zone formed between the first and second fluid microchannels so that the solute is able to diffuse from the analyte-containing fluid phase into the extractant fluid phase. The analyte-containing fluid phase and/or the extractant fluid phase is a particle laden phase.
