1. Department of Chemistry Federal University of Maranhão Dos Portugueses Av., 1966 65080-805 São Luís, MA Brazil
2. Nanotechnology Engineering Program Alberto Luiz Coimbra Institute for Graduate Studies and Research in Engineering COPPE Federal University of Rio de Janeiro Horácio Macedo Av., 2030 21941-972 Rio de Janeiro, RJ Brazil
3. Department of Chemistry Universidade Federal de São Carlos Washington Luiz Rod., s/n São Carlo SP 13565-905, SP Brazil
4. South American Center for Education and Research in Public Health Universidad Norbert Wiener Lima 15108 Peru