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通过溶胶 -凝胶法制备了蛋白质 -SiO2 无机纳米杂化材料。FTIR研究表明 :正硅酸乙酯水解产生的高表面活性微粒 ,与精氨酸、组氨酸、色氨酸侧基的 -C =N -基团发生了键合反应 ,并生成了新的化学键Si-C ,同时前驱体水解产生的Si-OH ,与蛋白质分子的侧基CH -OH间也可发生缩合反应 ,因而在有机相和无机相之间产生强烈的相互作用。纳米粒子的尺寸随制备条件和SiO2 含量的改变而改变 ,当SiO2 含量小于 3%且控制前驱体慢慢水解时 ,生成纳米粒子的尺寸均在 5 0 - 80nm之间 ;当SiO2 含量高且水解速度较快时 ,粒子的尺寸一般分布略宽且高于 10 0nm ;前驱体水解后 ,产生的SiO2 粒子在蛋白质中分散均匀 ,未发现明显的团聚现象
The protein-SiO2 nanomaterials were prepared by sol-gel method. FTIR studies show that the high surface active particles produced by the hydrolysis of tetraethyl orthosilicate undergo a bonding reaction with the -C = N - group of arginine, histidine and tryptophan pendant groups and a new The chemical bond Si-C, while the precursor hydrolysis of Si-OH, and the side-chain protein molecules can also occur condensation between the CH -OH reaction, thus in the organic phase and the inorganic phase have a strong interaction. The size of nano-particles changes with the preparation conditions and the content of SiO2. When the content of SiO2 is less than 3% and the precursor is slowly hydrolyzed, the sizes of nano-particles are between 50-80 nm. When the speed is faster, the size of the particles is generally slightly wider and higher than 10 0 nm. After the precursor is hydrolyzed, the resulting SiO2 particles are evenly dispersed in the protein and no obvious agglomeration phenomenon is found