Nanocomposites films based on soy proteins and montmorillonite processed by casting
Nanocomposites films based on soy proteins and montmorillonite processed by casting
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DOI：
10.1016/j.memsci.2013.08.006
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发表时间：
2014-01-01
影响因子：
9.5
通讯作者：
Mauri, Adriana N.
中科院分区：
文献类型：
--
作者：
Echeverria, Ignacio;Eisenberg, Patricia;Mauri, Adriana N.
本文研究了蒙脱土（MMT）在大豆蛋白基薄膜中的添加对纳米复合材料物理化学性能的影响，并分析了这些材料的结构-功能关系以及由于材料组分之间不同的相互作用而导致的相结构变化。在大豆蛋白（SP）基质中加入不同浓度的蒙脱土（MMT），以10g / 100g的SP为基材，采用铸造法制备了柔性纳米复合膜。所得膜均匀，淡黄色，透明，视觉上与纯蛋白膜难以区分。用于成膜的过程包括机械搅拌和超声波，结合MMT对sps的固有亲和力，有利于粘土的分散，从而达到高度嵌入蛋白质基质，从而使蛋白质之间的MMT层脱落（通过透射电子显微镜和x射线衍射验证）。薄膜内MMT层的有效分散和分布产生了纳米层的显著增强，这在观察到的抗破裂性中是显而易见的；弹性调节；延长、含水率、溶解度和水蒸气渗透性降低。在MMT存在的情况下，SPs中的二硫桥对蛋白质基质的稳定起着关键作用，而在单独由蛋白质组成的膜中，能够参与氢键的残基将参与其他类型的高度稳定的相互作用。(C) 2013 Elsevier B.V.版权所有
In this work the effect of montmorillonite (MMT) addition to soy-protein-based films on the physicochemical properties of the resulting nanocomposites was studied and the structure-function relationship of these materials and the changes in phase structures, due to different interactions among the material components were analyzed. Flexible nanocomposite films consisting in a soy-protein (SP) matrix supplemented with different concentrations of montmorillonite (MMT) up to 10 g/100 g of SP were prepared by the casting technique. The resulting films were homogeneous, yellowish, and transparent and indistinguishable visually from films of pure protein. The process used for film formation-involving mechanical agitation and ultrasonication, in combination with the intrinsic affinity of MMT for the SPs-favors the dispersion of the clay so as to reach a high degree of intercalation into the protein matrix with consequent exfoliation of the layers of MMT among the proteins (verified by both transmission electron microscopy and X-ray diffraction). The efficient dispersion and distribution of the MMT laminas within the films generated a significant strengthening of the nanolayer that was evident in the observed resistance to breakage; modulation of elasticity; and decrease in extension, moisture content, solubility, and permeability to water vapor. In the presence of MMT, the disulfide bridges in the SPs play a critical role in the stabilization of the protein matrix, whereas in the films composed of proteins alone the residues capable of participating in hydrogen bonding would be involved in other types of highly stabilizing interactions. (C) 2013 Elsevier B.V. All rights reserved