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Hydrophilic and Morphological Aspects of Films Based on Quaternary Salts of Chitosan for Edible Applications

机译:基于壳聚糖季盐的可食用薄膜的亲水性和形态学方面

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摘要

Aiming to improve the homogeneity of films based on chitosan to be applied as edible coating, we carried out some chemical modifications in the polymeric structure by reductive alkylation and quaternization reactions. The resulting derivatives had different hydrophilic behaviours and cast films were characterized by wetting, swelling and topographic measurements. Concerning wetting, all samples presented similar time dependence with receding water contact angles. The quaternized chitosans were the most hydrophilic derivatives, with lower values of contact angles when compared with the parent sample. These derivatives also exhibited a higher swelling tendency. The analysis shows that the relative amount of absorbed water increases according to the length of moiety added. In general, the cast films of chitosan showed good homogeneity, displaying low roughness and regular distribution over a polar surface. On the other hand, alkyl quaternary salts showed an irregular topography with undulation and mountain-like formation due probably to agglomeration of polymeric chains. The final film morphology was dependent on the polymer solubility, as observed by microscopic techniques.
机译:为了提高基于壳聚糖的薄膜的均匀性,该薄膜可作为食用涂料,我们通过还原烷基化和季铵化反应对聚合物结构进行了一些化学修饰。所得衍生物具有不同的亲水性,流延膜的特征在于润湿,溶胀和形貌测量。关于润湿,所有样品都表现出相似的时间依赖性,并且水接触角逐渐减小。季铵化的壳聚糖是最亲水的衍生物,与母体样品相比具有较低的接触角值。这些衍生物还表现出更高的溶胀趋势。分析表明,吸收水的相对量根据所添加的部分的长度而增加。通常,壳聚糖的流延膜显示出良好的均质性,显示出低粗糙度并且在极性表面上规则分布。另一方面,烷基季盐表现出不规则的形貌,具有起伏和山峰状的形成,这可能是由于聚合物链的团聚所致。如通过显微技术观察到的,最终的膜形态取决于聚合物的溶解度。

著录项

  • 来源
    《Packaging Technology and Science》 |2010年第2期|111-119|共9页
  • 作者单位

    Embrapa Instrwnentacao Agropecuaria, Rua XV de Novembro, 1452, C.P. 741, 13560-970 Sao Carlos, SP - Brazil EMBRAPA CNPDIA, R. XV de Novembro, 1452, PO 741, 13560-970 Sao Paulo, Brazil;

    Embrapa Instrwnentacao Agropecuaria, Rua XV de Novembro, 1452, C.P. 741, 13560-970 Sao Carlos, SP - Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    quaternary chitosan; morphology; edible film; coating; hydrophilic;

    机译:季壳聚糖形态学;食用膜涂层;亲水的;
  • 入库时间 2022-08-17 13:29:41

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