COLEUS AMBOINICUS LEAVES ASSISTED GREEN SYNTHESIS OF METAL AND METAL OXIDE NANOPARTICLES WITH DIFFERENT APPLICATIONS: A REVIEW

Navya Rao, Deepa Mudaliyar*, Vaibhav Parhad, Shriniwas Patil

ABSTRACT

Several attempts have been made for green synthesis of nanoparticles of different metals and metal oxides, revealing the significance of plant extracts in reducing metal source to nanoparticles and applications in various scientific domains. The present article focus on applications of Coleus amboinicus leaves extract in fabrication of nanoparticles of various metals like silver, gold, zinc oxide, and copper oxide. Coleus amboinicus is evergreen, perennial shrub, belonging to family Lamiaceae (Labiatae). Its leaves are reported to contain several nonpolar phytochemicals like terpenes. In respective research attempts, these metallic and metal oxide nanoparticles were evaluated for one or more applications like anti-microbial activity. Use of Coleus amboinicus polar extract indicated involvement of its phytocompounds in reducing the source and stabilizing the nanoparticles. In conclusion, it could be noted that metal and metal oxide nanoparticles have better antimicrobial activity over leaves extract.

Keywords: Coleus/ Plectranthus amboinicus, aqueous extract, nanoparticles, antimicrobial activity.