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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Characterization of Trilayer Antimicrobial Diffusion Films (ADFs) Based on Methylcellulose-Polycaprolactone Composites
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Characterization of Trilayer Antimicrobial Diffusion Films (ADFs) Based on Methylcellulose-Polycaprolactone Composites

机译：基于甲基纤维素-聚己内酯复合材料的三层抗菌扩散膜（ADF）的表征

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摘要

Novel trilayer antimicrobial diffusion films (ADFs) were developed for food applications. ADFs were composed of two external layers of polycaprolactone and one internal layer of nanocrystalline cellulose (NCC)-reinforced methylcellulose (MC) matrix. Two antimicrobial mixtures (formulations A and B) were incorporated in the MC layer and compared via the evaluation of film properties. Resulting ADFs were inserted as diffusion devices into vegetable packages, and samples were stored at 4 °C for 14 days. Microbiological diffusion assays in the presence of ADFs were performed on pathogenic bacteria. From this, the study focused on characterizing the structural, physicochemical properties and total phenols (TP) release from ADFs. This TP release was determined by Folin—Ciocalteu's method and by FTIR analysis. Results indicated a controlled release of antimicrobials into the headspace (16.5% for formulation A and 13.4% for formulation B). Good correlations (>90%) between both methods allowed validating an innovative, accurate, rapid FTIR procedure to quantify the diffusion of TP. SEM micrographs showed fibrillar structure due to NCC and a more compact network due to antimicrobials. Encapsulated antimicrobial formulations induced color changes without affecting visual attributes of films. ADFs containing formulation B exhibited the highest tensile strength (17.3 MPa) over storage.
机译：新型三层抗菌扩散膜（ADF）已开发用于食品应用。 ADF由两层聚己内酯外层和一层内层纳米晶纤维素（NCC）增强的甲基纤维素（MC）基质组成。将两种抗菌混合物（配方A和B）掺入MC层中，并通过评估薄膜性能进行比较。将产生的ADF作为扩散装置插入蔬菜包装中，并将样品在4°C下保存14天。在ADF存在下，对病原细菌进行了微生物扩散测定。因此，该研究集中于表征ADF的结构，物理化学性质和总酚（TP）释放。 TP释放是通过Folin-Ciocalteu方法和FTIR分析确定的。结果表明抗菌剂向顶部空间的控制释放（制剂A为16.5％，制剂B为13.4％）。两种方法之间的良好相关性（> 90％）可以验证创新，准确，快速的FTIR程序以量化TP的扩散。 SEM显微照片显示由于NCC而形成的原纤维结构，以及由于抗菌剂而形成的更紧密的网络。封装的抗微生物制剂可引起颜色变化，而不会影响薄膜的视觉特性。含有配方B的ADF在储存过程中表现出最高的抗张强度（17.3 MPa）。

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