蒲公英提取物-茶多酚-玉米秸秆纤维素抗菌复合膜制备与性能

Preparation and performance of cellulose antibacterial composite film from corn stover with dandelion extract and tea polyphenols

玉米秸秆的高附加值利用既可以减轻污染和资源浪费,还对探索秸秆的工业化利用和农业可持续发展具有深远的意义。以玉米秸秆制备的微晶纤维素(CSMCC)为原料,1-丁基-3-甲基咪唑氯盐([Bmim]Cl)为溶剂体系,蒲公英提取物(DE)和茶多酚(TP)为抗菌剂,通过共混法制备抗菌复合膜。通过FTIR、XRD、SEM和热重分析对复合膜的形貌和结构进行表征及对力学、光学、阻隔、抑菌等性能测试分析。结果表明:DE和TP与纤维素基膜较好地复合,复配抗菌剂DE-TP抗菌复合膜相比于DE、TP抗菌复合膜具有较优的拉伸强度((52.60±6.33)MPa)、氧气阻隔性能(氧气透过系数为(1.65±0.25)×10^(−11)cm^(3)·cm/(cm^(2)·s·Pa)),且对大肠杆菌和金黄色葡萄球菌具有更好的抑制作用。同时DE-TP抗菌复合膜断裂伸长率相比于纤维素基膜提升了53.96%,透光率保持在(82.56±0.26)%,具有良好的力学性能和光学性能。为制备对控制食品腐败变质和生物资源高效利用具有重要意义的环境友好型抗菌复合膜的研发提供新思路。

The high value-added utilization of corn straw can not only reduce pollution and resource waste,but also has far-reaching significance for exploring the industrial utilization of corn straw and sustainable agricultural development.Using microcrystalline cellulose(CSMCC)prepared from corn straw as raw material,1-butyl-3-methylimidazolium chloride([Bmim]Cl)as solvent system,dandelion extract(DE)and tea polyphenol(TP)as antibacterial agents,antibacterial composite film was prepared by blending method.The morphology and structure of the composite film were characterized by FTIR,XRD,SEM and thermogravimetric analysis,and the mechanical,optical,barrier and antibacterial properties were tested and analyzed.The results show that DE and TP are well combined with cellulose base film.The composite antibacterial agent DE-TP antibacterial composite film has better tensile strength((52.60±6.33)MPa),oxygen barrier performance(oxygen transmission coefficient is(1.65±0.25)×10^(−11) cm^(3)·cm/(cm^(2)·s·Pa))and better inhibition effect on Escherichia coli and Staphylococcus aureus than the DE and TP antibacterial composite films.At the same time,compared with the cellulose base film,elongation at break of DE-TP antibacterial composite film increased by 53.96%,and the light transmittance is(82.56±0.26)%,which has good mechanical and optical properties.It provides a new idea for the research and development of environment-friendly antibacterial composite film,which is important for controlling food spoilage and efficient utilization of biological resources.