中药材生物质还原制备银纳米颗粒及其抑菌活性研究

Study on preparation of silver nanoparticles by biomass reduction of traditional Chinese medicinal materials and their antibacterial activity

目的利用中药材提取液来还原Ag+获得相应的银纳米材料,并对其抑菌活性进行研究。方法利用大黄等15种中药材提取液还原制备了银纳米溶液,采用激光粒度仪(HPPS)、透射电镜(TEM)、紫外可见分光光度计(UV)测定了银纳米颗粒的尺寸和分布。采用纸片琼脂扩散法和倍比稀释法,测定了银纳米颗粒的抑菌作用。结果大黄、制首乌、香薷水提液还原制备的银纳米颗粒得率和反应速率较理想。制备所得的银纳米粒径为100 nm左右,均匀性好,分散性好,对金黄色葡萄球菌和大肠杆菌的生长均有明显的抑制作用,其中,以制首乌-银纳米抑菌作用最强。结论中药材作为天然生物还原剂,可用于银纳米颗粒的制备。

Objective To use the extracts from traditional Chinese medicinal materials（TCMM） for reduction of Ag＋ to obtain the corresponding silver nanomaterials and study its antibacterial activity. Methods Nano-silver solution was prepared by Rhei Radix et Rhizoma and other 15 kinds of TCMM extracts, the size and distribution of silver nanoparticles were studied using HPPS, TEM, and UV. The antibacterial activities of silver nanoparticles were investigated by disk agar diffusion method and double dilution method. Results Preparation rate and reaction rate of silver nanoparticles prepared with the water extract of Rhei Radix et Rhizoma, Polygoni Multiflori Radix Praeparata, Moslae Herba were ideal. Prepared silver nanoparticles with diameter about 100 nm, good uniformity, and good dispersibility have the obvious inhibitory effect on the growth of Staphylococcus aureus and Escherichia coli. Among them, Polygoni Multiflori Radix Praeparata-silver nano has the strongest bacteriostatic effect. Conclusion TCMM as a natural bio-reducing agents, can be used to prepare the silver nanoparticles.