Enzymes play an essential role in many aspects of pharmaceutical research as drug targets, drug metabolizers, enzyme drugs and more. In this specific field, enzyme assays are required to meet a number of specific requirements, such as low cost, easy automation, and high reliability. The integration of an immobilized-enzyme reactor to capillary electrophoresis represents a unique approach to fulfilling these criteria by combining the benefits of enzyme immobilization, that is, increased stability and repeated use, as well as the minute sample consumption, short analysis time, and efficient analysis provided by capillary electrophoresis. In this review, we summarize, analyze, and discuss published works where pharmaceutically relevant enzymes were used to prepare capillary electrophoresis-integrated immobilized-enzyme reactors in an online manner. The presented assays are divided into three distinct groups based on the drug-enzyme relationship. The first, more extensively studied group employs enzymes that are considered to be therapeutic targets, the second group of assays present tools to assess drug metabolism and the third group assesses enzyme drugs. Furthermore, we examine various methods of enzyme immobilization and their implications for assay properties.

Department of Biochemistry Faculty of Science Masaryk University Brno Czech Republic

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$a Schejbal, Jan $u Department of Biochemistry, Faculty of Science, Masaryk University, Brno, Czech Republic.

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$a Enzymes play an essential role in many aspects of pharmaceutical research as drug targets, drug metabolizers, enzyme drugs and more. In this specific field, enzyme assays are required to meet a number of specific requirements, such as low cost, easy automation, and high reliability. The integration of an immobilized-enzyme reactor to capillary electrophoresis represents a unique approach to fulfilling these criteria by combining the benefits of enzyme immobilization, that is, increased stability and repeated use, as well as the minute sample consumption, short analysis time, and efficient analysis provided by capillary electrophoresis. In this review, we summarize, analyze, and discuss published works where pharmaceutically relevant enzymes were used to prepare capillary electrophoresis-integrated immobilized-enzyme reactors in an online manner. The presented assays are divided into three distinct groups based on the drug-enzyme relationship. The first, more extensively studied group employs enzymes that are considered to be therapeutic targets, the second group of assays present tools to assess drug metabolism and the third group assesses enzyme drugs. Furthermore, we examine various methods of enzyme immobilization and their implications for assay properties.

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