Methyl gallate (MG) was used as a model substance to determine the influence of operating conditions on the supercritical impregnation of mango polyphenols into a multilayer polyethylene terephthalate (PET)/polypropylene (PP) food-grade film. The effects of pressure (10–20 MPa), temperature (35–55 °C), impregnation time (3–22 h) and stirring were analysed. The most favourable conditions were obtained under 10 MPa at 45 °C during 22 h in stirring mode. These operating conditions were implemented in the impregnation of a mango leaf extract (MLE). The results show that the MLE-loaded PET/PP films presented a high phenolics load, predominantly in MG (∼30 mg MG/100 g film), antioxidant capacity, demonstrated by DPPH assay, and potential application in the preservation of perishable foods such as fruit and vegetables.

没食子酸甲酯（MG）被用作模型物质，以确定操作条件对芒果多酚超临界浸渍到食品级聚对苯二甲酸乙二醇酯（PET）/聚丙烯（PP）多层膜中的影响。分析了压力（10–20 MPa），温度（35–55°C），浸渍时间（3–22 h）和搅拌的影响。在搅拌模式下，在45℃，10 MPa和22 h的条件下获得最有利的条件。这些操作条件是在浸渍芒果叶提取物（MLE）中实现的。结果表明，装载了MLE的PET / PP薄膜具有较高的酚类负载量，主要是MG（约30 mg MG / 100 g薄膜），抗氧化能力（通过DPPH分析证明）以及在易腐食品等防腐方面的潜在应用作为水果和蔬菜。