Preparation of oils

The extraction process described was performed in the Institute of Food Technology-ITAL (Campinas, São Paulo, Brazil). For oils extraction, 10 kg of papaya and melon seeds were laminated in mini press (MPE 40, Ecirtec, Bauru, São Paulo, Brazil). The laminated seeds were put in an expeller equipment and the extraction by solvent was performed in four stages. In each stage, 20 L of hexane were used at 45–50 °C. At first the hexane flowed for 20 min; in the second and third ones, flowed for 15 min, then, in the last one, only for 10 min. After extraction, the solvent was removed with the application of direct and indirect steam. The oils percentages extracted from papaya (Pa) and melon (Me) seeds were 11.7 and 15.3%, respectively.

Besides these oils, refined soybean oil (S) no addition of synthetic antioxidant was granted by the company Triângulo Alimentos^® located at Itápolis, São Paulo, Brazil, for the formulation of compounds oils: Soybeans and papaya (SPa, 80:20 w/w); Soybeans and melon (SMe, 80:20 w/w) and Soybeans, papaya and melon (SPaMe, 60:20:20 w/w/w). The soybean oil was used due to be widely consumed in Brazil.