Aqueous Phase Lavender Leaf Mediated Green Synthesis of Gold Nanoparticles and Evaluation of its Antioxidant Activity

Brajesh Kumar,Kumari Smita

doi:10.4172/0974-8369.1000290

Abstract

In this paper, green synthesis of gold nanoparticles (AuNPs) using leaf extract of Lavender (Lavandula angustifolia) and their antioxidant activity was evaluated under the ambient aqueous phase condition. Assynthesized AuNPs were characterized by visual, ultraviolet–visible–near infrared (UV–vis–NIR) spectroscopy, transmission electron microscopy (TEM), and dynamic light scattering (DLS) technique. Formation of AuNPs produces an intense absorbance peak at 530 and 1055 nm in UV–visible spectroscopy. TEM and DLS results confirmed that the synthesized AuNPs were crystalline, polydisperse, quasi-spherical and triangular shape with an average size ranging from 34–300 nm. UV-vis-NIR, TEM, and DLS study showed that the phytochemicals from the Lavender leaf extract have dual properties of reducing and stabilizing agents. Further, AuNPs (21.53%, 0.2 mL) showed higher antioxidant activity than Lavender leaf extract (4.73%, 0.2 mL) against 2,2-diphenyl-1-picrylhydrazyl. On looking these advantages, green synthesis of AuNPs without inert atmosphere is highly recommended for future medicinal and industrial application.

Highlights

In recent years, nanobiotechnology is one the most popular branch of nanotechnology, which received the most attention from the researchers, due to its economic and eco-friendly procedures to generate particles with a dimension smaller than 100 nm, with specific functions [1]
The plant materials like Azadirachta indica leaf [6], Cinnamomum camphora leaf [7], Lantana camara flower [2], Genipa americana fruit [8], Emblica officinalis fruit [9], Capsicum baccatum fruit [10], Abelmoschus esculentus seed [11] and Plukenetia volubilis oil [12] have been reported for the extracellular synthesis of AuNPs
This change of solution color may be attributed to the surface plasmon resonance (SPR), a specific phenomenon which arises due to the collective oscillations of electrons in the conduction band with that of electromagnetic radiation owing to which it gives absorption in the UV–vis–NIR region [15]

Summary

Introduction

Nanobiotechnology is one the most popular branch of nanotechnology, which received the most attention from the researchers, due to its economic and eco-friendly procedures to generate particles with a dimension smaller than 100 nm, with specific functions [1]. The plant materials like Azadirachta indica leaf [6], Cinnamomum camphora leaf [7], Lantana camara flower [2], Genipa americana fruit [8], Emblica officinalis fruit [9], Capsicum baccatum fruit [10], Abelmoschus esculentus seed [11] and Plukenetia volubilis oil [12] have been reported for the extracellular synthesis of AuNPs. Lavender (Lavandula angustifolia) is a widely distributed ornamental plant belongs to the family Lamiaceae and cultivated extensively in temperate climates of South America, Europe, and Asia. The plant is used in traditional and folk medicines in the different parts of the world for the treatment of several skin sores, insect bites, gastrointestinal, nervous and rheumatic disorders. Diuretic, antiepileptic, anti-rheumatic, pain reliever, relaxant, sedative, antioxidant, burn healing, antibacterial and anti-inflammatory properties [13,14]

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