Novel Materials and Nanotechnology Group, Instituto de Agroquímica y Tecnología de Alimentos, Consejo Superior de Investigaciones Científicas, Av Agustin Escardino 7, 46980 Paterna, Spain.
J Agric Food Chem. 2010 Jun 9;58(11):6884-94. doi: 10.1021/jf1007659.
The present study presents the development and characterization of biocomposites of a red-algae-derived carrageenan, mica, and their blends with zein prolamine obtained by solvent casting. The morphology of the blends was characterized by scanning and transmission electron microscopy (SEM and TEM), optical microscopy, and atomic force microscopy (AFM). Mechanical behavior, water barrier, water uptake, and UV-vis protection of the cast films were also investigated. The results indicated that the addition of 10 wt % glycerol to the blends resulted in a better dispersion of the additive and, for that reason, a better improvement for the studied properties. The composites were seen colored but transparent and exhibited the ability to block the UV-vis radiation because of the characteristic absorbing properties of the filler. Nevertheless, the main conclusion from the work is that the nanocomposites were seen to act as a reinforcing plasticizer and also led to significantly reduced water permeability and uptake. The clay was found to be more efficient in the latter aspect than the zein prolamine as an additive. As a result, these novel carragenan-based biocomposites can have significant potential to develop packaging films and coatings for shelf-life extension of food products.
本研究通过溶剂浇铸法制备了红藻源卡拉胶、云母及其与玉米醇溶蛋白共混物的生物复合材料，并对其进行了开发和特性研究。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）、光学显微镜和原子力显微镜（AFM）对共混物的形貌进行了表征。还研究了铸膜的机械性能、水阻隔性、吸水率和 UV-vis 保护。结果表明，向共混物中添加 10wt%的甘油可使添加剂更好地分散，从而更好地改善所研究的性能。复合材料呈有色透明状，并具有阻挡 UV-vis 辐射的能力，这是由于填料的特征吸收特性所致。然而，从这项工作中得出的主要结论是，纳米复合材料起到了增强增塑剂的作用，同时还显著降低了水的渗透性和吸水量。与玉米醇溶蛋白相比，粘土在这方面的效果更为显著，是一种更有效的添加剂。因此，这些新型基于卡拉胶的生物复合材料在开发食品货架期延长用包装膜和涂料方面具有很大的潜力。
