Phytosynthesis of gold nanoparticles using leaf extract of Coleus amboinicus Lour

Present study reports a green chemistry approach for the biological synthesis of gold nanoparticles by using the leaf extract of Coleus amboinicus Lour The nanoparticles were structurally characterized by UV-Vis spectroscopy XRD TEM and SAED analyses Elemental and vibrational analyses were done with EDAX and FT-IR spectroscopes respectively Bioreduction of gold ions by C amboinicus leaf extract resulted in the synthesis of spherical truncated triangle triangle hexagonal and decahedral nanoparticles These nanoparticles showed an absorption peak at 536 nm in UV-Vis spectrum corresponding to the plasmon resonance of gold nanoparticles The size of gold nanoparticles ranged from 4 6 to 55 1 nm FT-IR spectrum confirmed the involvement of aromatic amines amide (II) groups and secondary alcohols in capping and reduction of gold nanoparticles Extracellular synthesis of gold nanoparticles is a simple cheap and environmentally benign alternative to physical and chemical procedures (C) 2010 Elsevier Inc All rights reserved