Microemulsions are used in a similar way as micellar solutions are used for separations in capillary electrophoresis. Within the last six years, a number of papers have appeared in the literature in which the separation characteristics of microemulsion electrokinetic chromatography (MEEKC) have been investigated. The total number of papers dealing with MEEKC is now close to 100. One of the major fields of application for MEEKC has been the characterization of the lipophilicity of chemical substances but the technique has also been applied for the analysis of substances within the fields of natural products, pharmaceuticals, vitamins, peptides, proteins, and nucleic acid bases as well as nucleosides. An overview of the applications is given together with the microemulsions used for each application. Microemulsion electrokinetic chromatography Review Steen Honore Hansen shh@dfuni.dk http://www.dfh.dk/index.php?id=1338 The Danish University of Pharmaceutical Sciences Department of Analytical Chemistry DFU http://www.dfuni.dk/index.php?id=531 01730835 15222683 2003 24 22-23 3900-3907 10.1002/elps.200305637 http://www3.interscience.wiley.com/cgi-bin/abstract/106568866/