Photoassisted Synthesis of Silver Nanoparticles Using Riceberry Rice Extract and Their Antibacterial Application

Pimsumon Jiamboonsri,Sompit Wanwong,P Davide Cozzoli

doi:10.1155/2021/5598924

Abstract

The green synthesis of silver nanoparticles (AgNPs) has been attractive in biomedical applications due to its nontoxic and eco-friendly approach. This study presents the facile, rapid, and cost-effective synthesis of AgNPs by photoassisted chemical reduction using Riceberry (RB) rice extract as a reducing agent. The effects of reaction parameters including photoirradiation, irradiation time, the volume ratio of silver nitrate (AgNO3) to RB extract, and pH condition on the AgNP formation were also investigated. The characterization of AgNPs was determined by UV–visible spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier-transform infrared (FT-IR) spectroscopy. For antibacterial application, the synthesized AgNPs were studied by disc diffusion method against Escherichia coli and Staphylococcus aureus. The results indicated that light irradiation was an important factor to accelerate the formation of AgNPs. The synthesis parameters including volume of RB extract and pH condition significantly affected the particle size and crystallinity of AgNPs. The volume ratio of AgNO3 to RB extract 1 : 12.5 at pH 2.5 under photoirradiation was the successful condition to form nanometer-sized crystalline particles (average particle size of 59.48 ± 0.37 nm ) within 30 min with a rate constant of 0.210 min–1. The FT-IR measurement also suggested that the phytochemical constituents in RB extract were served as reducing and stabilizing agents for the synthesis of AgNPs. Additionally, the obtained AgNPs from various conditions demonstrated the antibacterial activity against both strains. Therefore, this study proposes an effective integration technique to synthesize AgNPs within a short time for antibacterial application.

Highlights

IntroductionNanoparticles (NPs), which are defined as particles having one or more dimensions between 1 and 100 nanometers (nm), have become popular in a wide range of application areas such as engineering [1], food [2], cosmetic [3], and textile [4, 5], as well as pharmaceutical field [6]
In the past decade, nanoparticles (NPs), which are defined as particles having one or more dimensions between 1 and 100 nanometers, have become popular in a wide range of application areas such as engineering [1], food [2], cosmetic [3], and textile [4, 5], as well as pharmaceutical field [6]
The comparison with the previous methods using rice extract for AgNP synthesis is shown in Table 1.This study presents a rapid and effective combination approach to synthesize AgNPs with sub-100-nm-sized spherical and hexagonal particles within 30 min at room temperature by using a ratio of AgNO3 to RB extract 1 : 12.5 at pH 2.5, whereas the condition of previous reports required a high temperature (75 and 121°C) or a long reaction time (60 min) for synthesis

Summary

Introduction

Nanoparticles (NPs), which are defined as particles having one or more dimensions between 1 and 100 nanometers (nm), have become popular in a wide range of application areas such as engineering [1], food [2], cosmetic [3], and textile [4, 5], as well as pharmaceutical field [6]. AgNPs can be used as a coating material on hospital textile, catheter, and implantable materials to prevent microbial infection [9]. These applications depend on the size and shape of AgNPs, and minimizing toxic residue from synthesis methods needs to be concerned [10, 11]. The chemical-based synthesis by organic and inorganic reducing agents is the most common approach because it offers the reliability of large-scale production and short time synthesis [9, 14, 17]. Polyphenol-rich plants are a good alternative source to synthesize AgNPs

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Conclusion