Muñoz-Gimena Pedro Francisco, Aragón-Gutiérrez Alejandro, Blázquez-Blázquez Enrique, Arrieta Marina Patricia, Rodríguez Gema, Peponi Laura, López Daniel
Instituto de Ciencia y Tecnología de Polímeros (ICTP-CSIC), C/Juan de la Cierva 3, 28006 Madrid, Spain.
Grupo de Tecnología de Materiales y Envases, Instituto Tecnológico del Embalaje, Transporte y Logística, ITENE, Unidad Asociada Al CSIC, C/Albert Einstein 1, Paterna, 46980 Valencia, Spain.
Polymers (Basel). 2024 Oct 10;16(20):2868. doi: 10.3390/polym16202868.
Biopolymers derived from biomass can provide the advantages of both biodegradability and functional qualities from a circular economy point of view, where waste is transformed into raw material. In particular, avocado seeds can be considered an interesting residue for biobased packaging applications due to their high starch content. In this work, avocado seed starch (ASS)-based films containing different glycerol concentrations were prepared by solvent casting. Films were also reinforced with starch nanocrystals (SNCs) obtained through the acid hydrolysis of ASS. The characterization of the extracted starch and starch nanocrystals by scanning electron microscopy, X-ray diffraction, and thermogravimetric analysis has been reported. Adding 1% of SNCs increased elastic modulus by 112% and decreased water vapor permeability by 30% with respect to neat matrix. Interestingly, the bioactive compounds from the avocado seed provided the films with high antioxidant capacity. Moreover, considering the long time required for traditional plastic packaging to degrade, all of the ASS-based films disintegrated within 48 h under lab-scale composting conditions. The results of this work support the valorization of food waste byproducts and the development of reinforced biodegradable materials for potential use as active food packaging.
从循环经济的角度来看，源自生物质的生物聚合物兼具生物可降解性和功能特性的优势，在循环经济中，废弃物可转化为原材料。特别是，鳄梨种子因其高淀粉含量，可被视为生物基包装应用的一种有趣的残渣。在这项工作中，通过溶液浇铸制备了含有不同甘油浓度的基于鳄梨籽淀粉（ASS）的薄膜。薄膜还用通过ASS酸水解获得的淀粉纳米晶体（SNCs）进行了增强。已报道了通过扫描电子显微镜、X射线衍射和热重分析对提取的淀粉和淀粉纳米晶体进行的表征。相对于纯基质，添加1%的SNCs可使弹性模量提高112%，水蒸气透过率降低30%。有趣的是，鳄梨籽中的生物活性化合物赋予了薄膜高抗氧化能力。此外，考虑到传统塑料包装降解所需的时间较长，所有基于ASS的薄膜在实验室规模的堆肥条件下48小时内都会分解。这项工作的结果支持了食品废弃物副产物的增值利用以及开发用于潜在活性食品包装的增强型可生物降解材料。
