Peroxide value (POV)Soybean oil was poured into glass bottle, covered with the film (PPF film, PPF-TP0.10 film) and sealed with a line rope. All samples were stored in an oven at 50 °C for 30 days. Samples for peroxide value (POV) analysis was measured according to Firestone (2009) every 6 days in triplicate and the results averaged. Samples without film packaging were used as control.