The reaction mixtures needed for the experiments were prepared by alkaline ethyl transesterification of vegetable oils.They
were used degummed soybean oil and crude canola oil donated by Cocamar (Maringá,ParanáState,Brazil),and commercial refined soybean and canola oils.The anhydrous ethanol (99.4%purity) was
donated by Cocafé,Astorga,ParanáState,Brazil and sodiumhydroxide (NaOH) was purchased from Biotec.