Plasma (heparin as anticoagulant) of 60 volunteers (19 ± 1 years
of age) was used to perform the experiments. The blood collection
was done by an accredited pharmacist using appropriate procedures.
After collection, the blood was centrifuged and the plasma
of all volunteers was mixed and stored frozen (70 C) until use.
The project was previously submitted and approved by the Institutional
Ethics Committee on Human Research (CEP/FOP/UNICAMP—
Protocol 19/2004).