1. Nanotechnology National Laboratory for Agriculture, Embrapa Instrumentation, 13560-970 São Carlos, SP, Brazil
2. Graduate Program of Biotechnology, Federal University of Sao Carlos, 13565-905 São Carlos, SP, Brazil
3. Graduate Program of Chemical Engineering, Federal University of Sao Carlos, 13565-905 São Carlos, SP, Brazil
4. Embrapa Corn and Sorghum, 35701-970 Sete Lagoas, MG, Brazil