金属-多酚网络/纤维素微纤丝复合物的制备及其抗氧化性和稳定性研究

Study on Preparation, Antioxidant Property, and Stability of Metal-Polyphenol Network/Cellulose Microfibrils Composite

利用Fe^(3+)和单宁酸(TA)制备金属-多酚网络(MPN),并用于纤维素微纤丝(CMF)的功能化改性,以制备CMF-MPN复合物,探讨CMF与MPN制备条件对CMF-MPN复合物抗氧化性和稳定性等的影响。结果表明,MPN可赋予CMF抗氧化性,当TA与Fe^(3+)质量比为4∶1、pH值为3制备的MPN添加量为2%(相对于绝干CMF质量)时,所得CMF-MPN复合物的DPPH清除率达97.0%;热重分析结果表明,CMF-MPN复合物残余质量相对于CMF提高了8.13%,但最大热降解温度略有下降;傅里叶变换红外光谱分析结果表明,CMF与MPN间的吸附为物理吸附;以CMF为载体可以提高MPN结构的稳定性,放置60天后仍能保持初始抗氧化性的80%左右,具有缓慢持续释放抗氧化因子的性能,这为开发绿色食品保鲜包装材料提供了新思路。

Metal-polyphenol network(MPN)was prepared by Fe^(3+)and tannic acid(TA),which was further used for functional modification of cellulose microfibrils(CMF),to prepare CMF-MPN complex.The effects of preparation conditions of CMF and MPN on the antioxidant property and stability of the CMF-MPN complex were investigated.The results showed that MPN endowed CMF with antioxidant property,and the DPPH clearance rate of the obtained CMF-MPN complex reached to 97.0%at MPN(prepared at TA∶Fe^(3+)=4∶1 and pH value of 3)additive amount of 2%.The residual mass of CMF-MPN complex increased by 8.13%compared with CMF but the maximum pyrolysis temperature decreased slightly according to the thermogravimetric analysis(TGA).Fourier transform infrared spectroscopy(FT-IR)analysis suggested the physical adsorption between CMF and MPN.Moreover,the application of CMF as a carrier improved the stability of the MPN structure,maintaining 80%of the initial antioxidant property after 60 days,showing the performance of releasing antioxidant factors continuously and slowly.This work provided a new idea for the development of green food preservation packaging materials.