2.6 Quantification of EOs in LDPE-EVA films
Five grams of film samples were extracted with 200 ml of ethanol by Soxhlet extraction for at least 18 h. The extract was characterized by UV-VIS spectrophotometer (Model V-550, Jasco international Co., Ltd., Japan). The actual concentration of EOs in the films was calculated from calibration curve for each EO.