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The development and applications of microfluidic devices for a lab-on-a-chip application have been reported extensively over the past two years.Their unique ability to manipulate fluids at micro and nano scales has led to their application in areas like biochemical analysis,studying reaction kinetics and diffusion characteristics,electrochemical synthesis as well as protein separations.Miniaturisation not only gives higher efficiency and reproducibility in biocatalytic processes but also makes them cost effective and inherently safe.By careful design of the device well defined mass transport conditions prevail and quantitative analysis may be performed.