丁香酚对高粱醇溶蛋白可食性膜结构及性能的影响

为开发天然的可降解、可食性包装材料,以高粱醇溶蛋白为原料,采用溶液共混的方法制备可食性丁香酚/高粱醇溶蛋白复合膜,分析不同浓度丁香酚对可食性高粱醇溶蛋白膜物理性能及微观结构的影响并探讨其变化机理。结果表明,添加4%丁香酚可优化蛋白膜的机械性能,提升膜的拉伸强度(TS)和断裂伸长率(EAB);添加丁香酚不影响蛋白膜的水蒸气透过系数(WVP),但略微提高了蛋白膜的溶解度;添加4%丁香酚可增加蛋白膜对紫外光和可见光的吸光度值,即增强膜的光阻隔性能。DSC测量显示,添加丁香酚后降低了高粱醇溶蛋白的玻璃态转变温度(Tg),表明丁香酚提高了丁香酚/高粱醇溶蛋白复合膜的延展性;FTIR分析结果表明,添加丁香酚后使得高粱醇溶蛋白二级结构中的α-螺旋、无规则卷曲转变为β-折叠、β-转角,表明丁香酚有助于提高丁香酚/高粱醇溶蛋白复合膜的机械性能;SEM结果显示,4%丁香酚与高粱醇溶蛋白的相容性良好,制备的复合膜截面光滑紧致。本研究结果为可降解、可食性膜新材料的研究及应用推广提供了理论参考。

Effect of Eugenol on Performance and Structure of Kafirin Films

In order to develop natural degradable and edible packaging materials, kafirin was used as raw material, eugenol/kafirin composite films was made by a blending method was prepared by solution blending with sorghum gliadin, and the effects of different concentration of eugenol on the physical properties and microstructures of edible sorghum gliadin memb ranes were analyzed, as well as the changing mechanism. The results showed that the 4% eugenol would optimize the mechanical properties of the protein films, improve tensile strength (TS) and elongation at break (EAB); the addition of eugenol did not affect water vapor permeability of the films, but slightly increased the solubility. 4% eugenol increased the absorbance of the films to ultraviolet light and visible light, that is, the barrier properties to light of the films increased. The results of DSC showed that eugenol reduced the glass transition temperature (Tg) of the protein films, indicating that the eugenol increased the ductility of the protein films; FTIR analysis showed that eugenol led to the secondary structure transition, from α-helix and random coil to β-sheet and β-turn, indicating that the eugenol could effectively improve the mechanical properties of the composite films. SEM also showed that 4% concentration of eugenol had good solubility with kafirin, the films section of that was smooth and firm, which can be appeared regular lines. The results showed that the eugenol had good compatibility with kafirin, and the concentration of eugenol had a significant effect on the performance of kafirin films. This study would provide a theoretical reference for the research and application of new degradable and edible film materials.