Mimusops elengi bark extract mediated green synthesis of gold nanoparticles and study of its catalytic activity

Rakhi Majumdar,Braja Gopal Bag,Pooja Ghosh

doi:10.1007/s13204-015-0454-2

Rakhi Majumdar, Braja Gopal Bag + Show 1 more

Open Access

https://doi.org/10.1007/s13204-015-0454-2

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Journal: Applied Nanoscience	Publication Date: May 20, 2015
Citations: 86	License type: CC BY 4.0

Affiliation: Vidyasagar University

Abstract

The bark extract of Mimusops elengi is rich in different types of plant secondary metabolites such as flavonoids, tannins, triterpenoids and saponins. The present study shows the usefulness of the bark extract of Mimusops elengi for the green synthesis of gold nanoparticles in water at room temperature under very mild conditions. The synthesis of the gold nanoparticles was complete within a few minutes without any extra stabilizing or capping agents and the polyphenols present in the bark extract acted as both reducing as well as stabilizing agents. The synthesized colloidal gold nanoparticles were characterized by HRTEM, surface plasmon resonance spectroscopy and X-ray diffraction studies. The synthesized gold nanoparticles have been used as an efficient catalyst for the reduction of 3-nitrophenol and 4-nitrophenol to their corresponding aminophenols in water at room temperature.

Highlights

Colloidal gold nanoparticles (AuNPs) has been the subject of tremendous research interest in recent years because of their applications in diversified areas such as catalysis, biotechnology, drug delivery, medicine and electronics. (Alkilany et al 2013; Zhang et al 2012; Murphy et al 2008; Prati and Villa 2014; Thomas and Kamat 2003)
The present study shows the usefulness of the bark extract of Mimusops elengi for the green synthesis of gold nanoparticles in water at room temperature under very mild conditions
The synthesis of the gold nanoparticles was complete within a few minutes without any extra stabilizing or capping agents and the polyphenols present in the bark extract acted as both reducing as well as stabilizing agents

Summary

Introduction

Colloidal gold nanoparticles (AuNPs) has been the subject of tremendous research interest in recent years because of their applications in diversified areas such as catalysis, biotechnology, drug delivery, medicine and electronics. (Alkilany et al 2013; Zhang et al 2012; Murphy et al 2008; Prati and Villa 2014; Thomas and Kamat 2003). Plant extract mediated solution phase synthesis of AuNPs involving reduction of Au(III) to Au(0) by plant extracts has gained profound significance in recent years because of the renewable and biocompatible nature of the plant extracts, eco-friendly aqueous medium and mild reaction conditions (Anastas and Kirchhoff 2002; Iravani 2011). The AuNPs have been synthesized using the bark extract of Mimusops elengi as a bio-reducing agent. The catalytic activities of biosynthesized colloidal AuNPs have been investigated for the reduction of 3-nitrophenol (3-NP) and 4-nitrophenol (4-NP) in aqueous medium in the presence of sodium borohydride (NaBH4) as a reducing agent. UV–Vis spectroscopic measurements of the solutions were carried out after 3 h of HAuCl4 and Mimusops elengi bark extract was mixed. Mass spectra of the bark extract of Mimusops elengi were recorded in Shimadzu GCMS QP 2100 Plus. All the UV– Vis spectra were recorded in Shimadzu 1600 spectrophotometer

Results and discussion

Conclusions