Green synthesis of gold nanoparticles using Croton Caudatus Geisel leaf extract and their biological studies

[Display omitted] •Biosynthesis of gold nanoparticle using Croton Caudatus Geisel extract is described in first time.•Size of Au nanoparticles was found to be around 20 nm and spherical in shape.•Synthetic procedure is very simple, greener and no need of any capping agent.•Studied the antibacterial, anti-fungal, Free radical scavenging ability and cytotoxicity activity against hela cell lines. A simple one-pot green approach for the biosynthesis of gold nanoparticles (AuNPs) by reducing chloroauric acid (HAuCl4) with extract of Croton Caudatus Geisel is described. The synthesized new gold nanoparticles were extensively characterized by UV Visible spectroscopy, FT-IR, XRD, SEM-EDAX and TEM analysis. The size, shape and purity were analyzed. The biological profile such as In vitro cytotoxicity activity, In vitro antimicrobial activity, Free radical scavenging ability and In vitro antifungal activity were investigated and shows the significance of their application towards biological activity.