Department of Food Science and Technology, National Nutrition and Food Technology Research Institute, Faculty of Nutrition Sciences and Food Technology, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
School of Packaging, Michigan State University, East Lansing, MI 48824, USA.
Int J Biol Macromol. 2014 Aug;69:282-9. doi: 10.1016/j.ijbiomac.2014.05.015. Epub 2014 May 14.
In this study, we aimed to improve the physical, mechanical and water-vapor permeability (WVP) properties of kappa-carrageenan (KC) films by including montmorillonite (MMT) nanoclay in the film-forming solution. To further improve these properties, the combined effect of Zataria multiflora Boiss essential oil (ZEO) and MMT was also investigated. The incorporation of MMT improved the physical and mechanical properties of KC film. Film made from KC alone had a tensile strength (TS) of 26.29MPa, while the KC film with 10% nanoclay had a TS of 34.67. Further analysis was provided by X-ray diffraction and scanning electron microscopy that confirmed the dispersion of MMT in the KC matrix. It was also shown that the combined effect of nanoclay and ZEO significantly improved the TS and EB of KC films. ZEO decreased the WVP of the nanocomposite films; for example, 3% ZEO reduced WVP by around 78%. The antimicrobial activity of nanocomposite films was also studied using the overlay and vapor-phase methods; the films effectively inhibited the growth of five pathogens tested. Thus, the incorporation of both nanoclay and ZEO into KC films is a promising way to manufacture films with better mechanical, antimicrobial and WVP properties.
在这项研究中，我们旨在通过在成膜溶液中加入蒙脱土（MMT）纳米粘土来提高角叉菜胶（KC）膜的物理、机械和水蒸气透过性（WVP）性能。为了进一步改善这些性能，还研究了香薷挥发油（ZEO）和 MMT 的联合效应。MMT 的加入提高了 KC 膜的物理和机械性能。单独的 KC 膜的拉伸强度（TS）为 26.29MPa，而含有 10%纳米粘土的 KC 膜的 TS 为 34.67。X 射线衍射和扫描电子显微镜的进一步分析证实了 MMT 在 KC 基质中的分散。还表明，纳米粘土和 ZEO 的联合效应对 KC 膜的 TS 和 EB 有显著的提高作用。ZEO 降低了纳米复合材料膜的 WVP；例如，3%的 ZEO 将 WVP 降低了约 78%。还使用覆盖法和气相法研究了纳米复合材料膜的抗菌活性；这些膜有效地抑制了五种测试病原体的生长。因此，将纳米粘土和 ZEO 同时掺入 KC 膜中是制造具有更好机械性能、抗菌和 WVP 性能的膜的一种很有前途的方法。
