Li Shue, Mu Bin, Wang Xiaowen, Kang Yuru, Wang Aiqin
Key Laboratory of Clay Mineral Applied Research of Gansu Province, Center of Eco-Materials and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
Materials (Basel). 2020 Oct 18;13(20):4649. doi: 10.3390/ma13204649.
Eco-friendly betanin/clay minerals hybrid materials with good stability were synthesized by combining with adsorption, grinding, and heating treatment using natural betanin extracted from beetroot and natural 2:1 type palygorskite or 1:1 type halloysite. After incorporation of clay minerals, the thermal stability and solvent resistance of natural betanin were obviously enhanced. Due to the difference in the structure of palygorskite and halloysite, betanin was mainly adsorbed on the outer surface of palygorskite or halloysite through hydrogen-bond interaction, but also part of them also entered into the lumen of Hal via electrostatic interaction. Compared with palygorskite, hybrid materials prepared with halloysite exhibited the better color performance, heating stability and solvent resistance due to the high loading content of betanin and shielding effect of lumen of halloysite.
通过将从甜菜根中提取的天然甜菜红素与天然2:1型坡缕石或1:1型埃洛石进行吸附、研磨和热处理相结合，合成了具有良好稳定性的环保型甜菜红素/粘土矿物杂化材料。掺入粘土矿物后，天然甜菜红素的热稳定性和耐溶剂性明显增强。由于坡缕石和埃洛石结构的差异，甜菜红素主要通过氢键相互作用吸附在坡缕石或埃洛石的外表面，但也有一部分通过静电相互作用进入埃洛石的内腔。与坡缕石相比，用埃洛石制备的杂化材料由于甜菜红素的高负载量和埃洛石内腔的屏蔽作用而表现出更好的颜色性能、热稳定性和耐溶剂性。
