1. Department of PharmacyMaringa State University Av. Colombo 5790 87020‐900 Maringa Parana Brazil
2. Laboratory of Electronic Microscopy and MicroanalysisLondrina State University Rod Celso Garcia Cid, PR 445 86057‐970 Londrina Parana Brazil
3. Department of ChemistryMaringa State University Av. Colombo 5790 87020‐900 Maringa Parana Brazil
4. Department of Basic Health SciencesMaringa State University Av. Colombo 5790 87020‐900 Maringa Parana Brazil
5. Department of PhysicsMaringa State University Av. Colombo 5790 87020‐900 Maringa Parana Brazil