Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Nanjing 210042, China.
Int J Biol Macromol. 2021 Jan 15;167:1221-1229. doi: 10.1016/j.ijbiomac.2020.11.076. Epub 2020 Nov 13.
There is an increasing interest in substituting current packaging films with biologically-derived films without compromising mechanical properties and hydrophobicity. In this work, the esterified galactomannan (E-GM) films with good hydrophobicity, excellent oxygen barrier performance and high tensile mechanical strength were synthesized using anhydride esterification method prior to film formation. The hydrophobicity, mechanical properties, barrier properties, thermal stability and ultraviolet absorption of the prepared films were determined to fully investigate the features of galactomannan-based films. The results indicated that GM films can be successfully obtained by esterification. Compared to neat GM film, E-GM-1.5 film (acetic anhydride to GM of 1.5:1) achieved the highest degree of esterification (0.05), hydrophobicity (107°) and mechanical strength (92.0 MPa). In addition, the esterified GM films had lower toxicity for macrophages cells. The prepared E-GM films may provide more opportunities for further advancement and applications in the development of food packaging from natural resources.
人们越来越感兴趣的是用生物衍生薄膜替代目前的包装薄膜，同时又不影响机械性能和疏水性。在这项工作中，采用酸酐酯化法在成膜前合成了具有良好疏水性、优异的氧气阻隔性能和高拉伸力学强度的酯化半乳甘露聚糖（E-GM）薄膜。测定了所制备薄膜的疏水性、力学性能、阻隔性能、热稳定性和紫外线吸收性能，以充分研究基于半乳甘露聚糖的薄膜的特性。结果表明，GM 薄膜可以通过酯化成功获得。与纯 GM 薄膜相比，E-GM-1.5 薄膜（乙酸酐与 GM 的比例为 1.5:1）的酯化度（0.05）、疏水性（107°）和机械强度（92.0 MPa）最高。此外，酯化 GM 薄膜对巨噬细胞的毒性较低。所制备的 E-GM 薄膜可能为进一步开发利用天然资源制备食品包装提供更多机会。
