School of Chemical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan 38541, Republic of Korea; Department of Biomaterials, Saveetha Dental College and Hospitals, SIMATS, Saveetha University, Chennai 600077, India.
Department of Mechanical Engineering, Amrita Vishwa Vidyapeetham, Amritapuri, India; Centre for Flexible Electronics and Advanced Materials, Amrita Vishwa Vidyapeetham, Amritapuri, India.
Int J Biol Macromol. 2024 Oct;277(Pt 3):134511. doi: 10.1016/j.ijbiomac.2024.134511. Epub 2024 Aug 5.
Titanium dioxide (TiO) is a common pigment used in food packaging to provide a transparent appearance to plastic packaging materials. In the present study, poly(butylene adipate-co-terephthalate) (PBAT) incorporated with lignin-TiO nanoparticles (L-TiO) eco-friendly composite films was prepared by employing an inexpensive melting and hot-pressing technique. The P-L-TiO composite films have been studied using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM), Thermogravimetric analysis (TGA), and Differential scanning calorimetry (DSC) analysis. The FTIR results and homogeneous, dense SEM images confirm the interaction of L-TiO with the PBAT matrix. It has also been found that the addition of L-TiO nanoparticles can increase the crystallinity, tensile strength, and thermal stability of PBAT. The addition of L-TiO increased the tensile strength and decreased the elongation at break of films. The maximum tensile strength of the film, achieved with 5 wt% L-TiO, was 47.0 MPa, compared with 24.3 MPa for pure PBAT film. The composite film with 5 wt% L-TiO has outstanding oxygen and water vapor barrier properties. As the content of lignin-TiO increases, the antimicrobial activity of the composite films also increases; the percentage of growth of all the tested bacteria Staphylococcus aureus (S. aureus), and Escherichia coli (E. coli) is significantly reduced. Strawberries were packed to evaluate the suitability of produced composite films as packaging materials, as they effectively preserved pigments from accumulation and extended the shelf-life as compared to commercial polyethylene packaging film.
二氧化钛（TiO）是一种常用于食品包装的常见颜料，可提供塑料包装材料的透明外观。在本研究中，通过采用廉价的熔融和热压技术，制备了木质素-TiO 纳米粒子（L-TiO）环保型复合膜的聚丁二酸丁二醇酯-对苯二甲酸酯共聚物（PBAT）。使用傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）、扫描电子显微镜（SEM）、热重分析（TGA）和差示扫描量热法（DSC）分析了 P-L-TiO 复合膜。FTIR 结果和均匀、致密的 SEM 图像证实了 L-TiO 与 PBAT 基质的相互作用。还发现，添加 L-TiO 纳米粒子可以提高 PBAT 的结晶度、拉伸强度和热稳定性。L-TiO 的添加增加了薄膜的拉伸强度并降低了断裂伸长率。与纯 PBAT 薄膜的 24.3 MPa 相比，添加 5 wt% L-TiO 的薄膜的最大拉伸强度达到 47.0 MPa。添加 5 wt% L-TiO 的复合膜具有出色的氧气和水蒸气阻隔性能。随着木质素-TiO 含量的增加，复合膜的抗菌活性也增加；所有测试的细菌金黄色葡萄球菌（S. aureus）和大肠杆菌（E. coli）的生长百分比均显著降低。用复合膜包装草莓，评估所制备的复合膜作为包装材料的适用性，因为与商业聚乙烯包装膜相比，复合膜有效地防止了颜料的堆积并延长了保质期。
