1. Biochemical and Pharmaceutical Technology Dept./FCF; University of São Paulo. Av. Prof. Lineu Prestes; 580-Bloco 16 CEP 05508-000 São Paulo Brazil
2. Physical Chemistry Dept., Faculty of Biochemistry and Pharmaceutical Sciences; National University of Rosario; Suipacha 570 S2002LRK Rosario Argentina
3. Dept. of Clinical Analysis and Toxicology; University of São Paulo; São Paulo Brazil