Extracellular Biosynthesis of Ag Nanoparticles by Commercial Baker's Yeast

摘要

In this paper, we demonstrated a simple and efficient method to synthesize Ag nanoparticles (NPs) using commercial and highly active baker's yeast as a stabilizier and reducing agent, which got rid of the cumbersome steps to cultivate yeast. Ag NPs could be formed within 2 min at pH value higher than 8 when silver ion react with the yeast. The effect of pH on the extracellular synthesis of Ag NPs was investigated. The results indicated that the optimized pH value was above 8. The biosynthesized Ag NPs had absorption peaks at 413～455 nm corresponding to their surface plasmon resonance. SEM and TEM images showed that the nanoparticles were uniformly monodisperse and spherical with the size of around 5～25 nm.