Materials
P. edulis Sims f. flavicarpa Degener oil in natura was purchased from a reputable firm (Extrair Óleo Vegetal Ltda., Brazil) and the oil in natura of M. oleifera Lam was extracted by cold pressing, resulting in a satisfactory extraction amount of 40% (oil in natura means fresh oil without purification treatments). In addition, sources of other chemicals were supplied by different companies and used as received, as follows: chloro iodine sec. Wijs, formic acid (85.0%), sodium thiosulfate (99.5%), potassium iodate (99.0%) and anhydrous sodium carbonate (99.0%) supplied by Mahal Impex Comercial Ltda; anhydrous sodium sulfate (99.0%) and toluene (99.5%) by Vetec; chloroform (99.0%) by Quimex Chemical Products Ltda. (Brazil); cyclohexane (99.5%) and hydrogen peroxide (30.0%) by Labsynth Products Laboratory Ltda. (Brazil)