Henan University of Technology, Zhengzhou 450001, China; North China University of Water Resources and Electric Power, Zhengzhou 450011, China; Henan Nanjie Village Group (Limited) Company, Luohe 462600, China.
Henan University of Technology, Zhengzhou 450001, China.
Int J Biol Macromol. 2018 Feb;107(Pt A):1302-1309. doi: 10.1016/j.ijbiomac.2017.09.114. Epub 2017 Sep 29.
The present study describes the microstructure, physical (tensile strength, elongation at break, water-vapor permeability, optical characteristics) and antimicrobial properties of biodegradable films prepared by incorporating different concentrations of lemon essential oil (LO) and surfactants (Span 80, Tween 80) into corn and wheat (CW) starch film. Results showed that the incorporation of LO provoked a decrease in water content, transparency, whiteness index (WI), water vapor permeability (WVP), solubility and tensile strength properties. Higher b*, elongation and haze values were observed in CW-LO composite films. Films with LO, especially at higher concentrations, were more effective against all tested bacteria than the control films. The films' surface and cross-section morphology was different depending on the LO contents. Compared with the CW-1LO film, the addition of surfactants significantly increased antimicrobial activity, solubility, haze, surface coarseness and porosity; remarkably decreased tensile strength and transparency. The film containing only Tween 80 showed higher b*, water content, solubility and WVP, lower WI and elongation when compared with the film containing only Span 80. These properties with some good physical and antimicrobial characteristics suggest applications for CW-LO-T/S film in a wide range of food products.
本研究描述了通过将不同浓度的柠檬精油（LO）和表面活性剂（Span 80、Tween 80）掺入玉米和小麦（CW）淀粉薄膜来制备可生物降解薄膜的微观结构、物理性质（拉伸强度、断裂伸长率、水蒸气透过率、光学特性）和抗菌性能。结果表明，掺入 LO 会降低水分含量、透明度、白度指数（WI）、水蒸气透过率（WVP）、溶解度和拉伸强度。在 CW-LO 复合膜中观察到更高的 b*、伸长率和雾度值。与对照膜相比，含有 LO 的薄膜，尤其是在较高浓度下，对所有测试的细菌都更有效。薄膜的表面和横截面形态因 LO 含量而异。与 CW-1LO 薄膜相比，表面活性剂的添加显著提高了抗菌活性、溶解度、雾度、表面粗糙度和孔隙率；显著降低了拉伸强度和透明度。与仅含有 Span 80 的薄膜相比，仅含有 Tween 80 的薄膜具有更高的 b*、水分含量、溶解度和 WVP，更低的 WI 和伸长率。这些具有一些良好的物理和抗菌特性的性能表明 CW-LO-T/S 薄膜在广泛的食品产品中的应用。
