The impregnation of piperine and black pepper extract into poly (L-lactic acid) (PLLA) films using supercritical CO2 was investigated. Piperine was a model to determine the influence of operating conditions of pressure (10 and 12 MPa) and temperature (40 and 50 °C) on the impregnation yield. The most favorable conditions were obtained at 10 MPa and 50 °C and were used in the incorporation of piperine and black pepper extract into 200 µm films. The addition of 5 and 10 % ethanol as cosolvent was tested during the impregnation processes of black pepper extract and piperine. The impregnated films were characterized on their thermal, mechanical, structural and surface properties. The addition of 5 % cosolvent favored the increase in piperine yield (5.6 %). The impregnation of piperine and extract using co-solvent led to an increase in the crystallinity of the films and significant changes in the mechanical properties. Supercritical technology has shown promise for the impregnation of active agents into PLLA films for potential development in food packaging applications.

中文翻译：

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胡椒碱和黑胡椒提取物的超临界 CO2 浸渍对聚（l-乳酸）薄膜性能的影响


研究了使用超临界 CO2 将胡椒碱和黑胡椒提取物浸渍到聚 （L-乳酸） （PLLA） 薄膜中。胡椒碱是确定压力（10 和 12 MPa）和温度（40 和 50 °C）操作条件对浸渍产率影响的模型。最有利的条件是在 10 MPa 和 50 °C 下获得，用于将胡椒碱和黑胡椒提取物掺入 200 μm 薄膜中。在黑胡椒提取物和胡椒碱的浸渍过程中测试了添加 5% 和 10% 乙醇作为助溶剂的情况。对浸渍膜的热、机械、结构和表面性能进行了表征。添加 5% 助溶剂有利于胡椒碱产量的增加 （5.6 %）。使用助溶剂浸渍胡椒碱和提取物导致薄膜结晶度增加，机械性能发生显着变化。超临界技术已显示出将活性剂浸渍到 PLLA 薄膜中的前景，有望在食品包装应用中进行开发。