Conventional chemical processes often require a series of complex synthesis steps that utilise a great deal of energy and raw materials. There is a huge commitment by the chemical industry to search for 'green', environmentally friendly processes. Biocatalysis, using enzymes to catalyse a chemical reaction, is emerging as an economical and ecological production route for a wide range of fine chemicals, pharmaceuticals and food ingredients. In addition to biocatalysis, miniaturised chemistry has also become of interest and significance to the chemical industry over the last decade. Microreactors allow for the synthesis of small volumes of compounds quickly and in high yield, with fast optimisation of conditions. Additionally, when used with immobilised biocatalysts, these miniaturised devices can enable the rapid throughput screening of a wide range of enzymes and their substrates. Despite this however, developments of applications in the field of miniaturised enzymatic processes are still in the initial stages.