Biosynthesis of gold nanoparticles using aqueous extracts of Mariposa Cristia Vespertillonis: influence of pH on its colloidal stability

Abstract

Noble nanoparticles has gain considerable attention due to their unique properties for various application. Gold nanoparticles have found wide interest in the medical, catalytic, sensing and environmental application. There is significant interest nowadays to synthesis gold nanoparticles in environmentally friendly way to minimize toxic chemicals. This paper reports the feasibility of using Mariposa Christia Vespertillonis (MCV) leaves as reducing agent for the formation of gold nanoparticles (AuNP). We studied the influence of reaction medium pH in tuning the colloidal stability of the gold nanoparticles with respect their hydrodynamic diameter. From the results, the pH of MCV leaf extracts play critical role in the colloidal stability of AuNP. The formation of colloidal stability of AuNP were optimal at mild acidic condition and relatively stable until 30 days post synthesis. It is envisaged the findings from this study could enhance the fundamental knowledge on tuning the colloidal stability of the gold nanoparticles plant mediated synthesis.