This Thesis focuses on microfluidics and its application to the biochemical characterisation of haloalkane dehalogenases. As summarized in the Introduction, microfluidics is a relatively novel interdisciplinary field with great potential for the future applications. In the past, miniaturization lead to a revolution in the fabrication of microchips and the same prospects promises microfluidics to the bio–chemical field. Performing reactions in smaller quantities require much fewer chemicals, diffusion times, mixing and heat transfer are almost instantaneous. The miniaturization technology has already affected next-generation sequencing and dramatically improves a high-throughput screening. More and more applications in the biotechnology field are emerging almost every day. In this work, we have applied some of these newly developed approaches to study the haloalkane dehalogenases. This enzyme family has been thoroughly studied since the early 1990s and is known for the ability to hydrolytically degrade various halogenated hydrocarbons. In the Introduction, I familiarize the reader with their origin, the structure and function, interesting substrates and interesting real-life applications.