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

中文关键词:  金属-多酚网络  纤维素微纤丝  抗氧化性  食品包装材料  复合物

Key Words:metal-polyphenol network  cellulose microfibrils  antioxidant property  food packaging material  complex

中文摘要:

      利用Fe³⁺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Fe³⁺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。

Abstract:

      Metal-polyphenol network （MPN） was prepared by Fe³⁺ 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∶Fe³⁺=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.