**Gel Electrophoresis for Investigating Enzymes with Biotechnological Application**

Maria de Lourdes T. M. Polizeli1\*, Simone C. Peixoto-Nogueira1, Tony M. da Silva1, Alexandre Maller2 and Hamilton Cabral3 *1Biology Department, Faculty of Philosophy Sciences and Letters of Ribeirão Preto, São Paulo University 2Biochemistry and Immunology Department School of Medicine of Ribeirão Preto, São Paulo, São Paulo University 3Science Pharmaceutical Department School of Pharmaceutical Science of Ribeirão Preto, São Paulo University Brazil* 
