[1]Department of Pharmaceutical Sciences Faculty of Pharmaceutical Sciences of Ribeir?o Preto Universidade de S?o Paulo Ribeir?o Preto 14040-903 SP Brazil;
[2]Physics Department Universidade Federal de Goiás(UFG) Campus Catal?o–Av.Dr.Lamartine Pinto de Velar 1120 St.Universitário 75704-020 Catal?o-GO Brazil;
[3]Pharmacy Course Coordination Centro Uni.Bar?o de Mauá R.Ramos de Azevedo 423 Jardim Paulista Ribeir?o Preto SP 14090-180 Brazil;
[4]Biophysics Laboratory Physics Institute Universidade Federal de Goiás(UFG) Goiania 74.690-900 GO Brazil;
Stratum corneum; O/W emulsions; Baru oil; EPR spectroscopy;