A Mechanistic and Kinetic Study of the Formation of Metal Nanoparticles by Using Synthetic Tyrosine-Based Oligopeptides
作者:Satyabrata Si、Rama Ranjan Bhattacharjee、Arindam Banerjee、Tarun K. Mandal
DOI:10.1002/chem.200500834
日期:2006.1.23
of tyrosine residues in the peptide increases. The kinetic study, based on spectrophotometric measurements of the surface plasmon resonance optical property, shows that the rate of formation of gold nanoparticles was much faster at higher pH than at lower pH and was also dependent on the number of tyrosine residues present in the peptide. The dityrosine form of the peptide was found to retain reducing
含有氧化还原活性酪氨酸残基的合成寡肽已用于制备金和银纳米粒子。在该还原过程中,来自肽的酪氨酸离子的电子通过形成酪氨酸基团在碱性pH下转移至金属离子,该酪氨酸基团最终在反应过程中转化为二氢酪氨酸形式。该反应机理已通过紫外可见光谱,荧光光谱和EPR光谱学得到证实,并发现是pH依赖性的。透射电子显微镜测量表明,金纳米颗粒的平均大小和单分散性随肽中酪氨酸残基数量的增加而增加。基于分光光度法测量表面等离振子共振光学特性的动力学研究,结果表明,金纳米颗粒的形成速率在较高的pH值下要比在较低的pH值下快得多,并且还取决于肽中存在的酪氨酸残基的数量。发现该肽的二酪氨酸形式保留了在碱性培养基中类似酪氨酸的还原特性。