淀粉包覆纳米银粒子的简易合成及其抗菌性能

Simple Preparation of Silver Nanoparticles Coated by Starch and Its Antibacterial Property

摘要:

提出一种绿色环保的简易方法来制备纳米银粒子。通过水浴加热，在淀粉的保护下，用葡萄糖还原硝酸银形成纳米银粒子；利用HRTEM、XRD 等分析了淀粉包覆纳米银粒子的结构，表明所制得的复合粒子具有包覆层（淀粉）和中心核（Ag）的复合纳米结构。UV-Vis 吸收光谱测试表明，胶态的纳米银粒子的吸光度随加热时间的延长而增加，当加热时间达4 h 时，吸光度值趋于稳定。TEM结果表明，纳米银粒子的形状为球形、单分散、平均粒径20 nm左右。采用抑菌环法对纳米银溶胶的抗菌性能进行检测，结果表明：抑菌环直径均大于7 mm，纳米银对金黄色葡萄球菌和大肠杆菌有抑菌作用

Abstract:

A simple green synthesis method of Ag nanoparticles was proposed. The silver nanoparticles were formed with the protection of starch using a water-bath heating method. The Ag+ from AgNO3 solution was reduced to Ag by glucose reduction. The product was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The nanocomposite with a silver core and starch shell was obtained. UV-Vis absorption spectrum shows that the absorbance of the colloidal silver nanoparticles increases with the radiation time, and it keeps stable when the radiation time is more than 4 h. TEM test shows that silver nanoparticles are of spherical shape, single dispersion and about 20 nm in particle size. The silver nanoparticles exhibit good antibacterial activity against S.aureus and E.coli, measured by the inhibition ring test