This text aims to evaluate the actual impact of high-performance capillary electrophoresis on analytical biotechnology and environmental analysis. The first part of the book presents a survey of present innovations in instrument design and different methods of pre-concentration techniques in order to obtain increased separations at higher sensitivities. The second part contains articles on applications of HPCE to protein and peptide analysis. In the third part, applications of HPCE in the investigation of drug abuse and drug interactions are presented. The last two parts of the book deal with the use of HPCE at low-UV wavelengths and negative-UV absorption. The book should be of interest to those working in HPCE research and applications.