Bilayer films using polyester blends (P) and starch (S) were obtained and characterized, incorporating carvacrol as active compound. Carvacrol was incorporated by spraying it between melt blended and compression moulded sheets or through its incorporation into the chloroform P solution used to obtain P cast films. Different PLA-PHBV ratios (75:25 and 65:35) were tested, with and without 15 wt.% of PEG1000, whereas the 75:25 ratio with PEG was only used for cast sheets, based on its better overall properties. Mono and bilayers were characterised as to their tensile and water vapour barrier properties and thermal behaviour. Release kinetics of carvacrol in different food simulants and in in vitro antibacterial activity against Listeria innocua and Escherichia coli were also analysed. Incorporating carvacrol by spraying it between the polyester and starch sheets was not effective at retaining the compound in the bilayers. However, the incorporation of carvacrol into cast P films, and the subsequent formation of bilayers with the S sheets, was highly effective at providing practically total carvacrol retention. These active bilayers exhibited highly improved tensile and water vapour barrier capacity with respect to the S monolayer (87% reduction in WVP, 840% increase in elastic modulus) and inhibited the growth of L. innocua and E. coli from both P or S contact sides of bilayers, depending on the internal diffusion of carvacrol through the bilayer and its adequate release of the compound into the culture medium.

使用香芹酚作为活性化合物，获得了使用聚酯共混物（P）和淀粉（S）制成的双层薄膜并进行了表征。香芹酚是通过在熔融共混和压模片材之间喷涂或通过将其掺入用于获得P流延膜的氯仿P溶液中而掺入的。在有和没有15％（重量）的PEG1000的情况下，测试了不同的PLA-PHBV比率（75:25和65:35），而基于PEG的更好的整体性能，与PEG的75:25比率仅用于流延板。对单层和双层的拉伸和水蒸气阻隔性能以及热性能进行了表征。香芹酚在不同食品模拟物中的释放动力学以及对无毒李斯特菌和大肠杆菌的体外抗菌活性还进行了分析。通过在聚酯和淀粉片之间喷洒香芹酚来将化合物保留在双层中是无效的。然而，将香芹酚并入流延P膜中，随后与S片形成双层，在提供几乎总的香芹酚保留方面非常有效。这些活性双层膜相对于S单层膜具有显着提高的拉伸和水蒸气阻隔能力（WVP降低87％，弹性模量提高840％），并抑制了P或S接触的无毒李斯特菌和大肠杆菌的生长。层的侧面，取决于香芹酚在双层中的内部扩散以及化合物向培养基中的适当释放。