Red tea leaves infusion as a reducing and stabilizing agent in silver nanoparticles synthesis

Abstract

Due to the unique properties of silver nanoparticles there is growing interest in their applications. Current trends in nanotechnology are focused on developing a new technique to synthesize nanoparticles using biological methods associated with the use of plant extracts, fungi, bacteria or essential oils. These methods are a promising alternative to conventional approaches which can minimize the use of hazardous substances. The silver nanoparticles synthesis using red tea infusion as a reducing and stabilizing agent and their characteristics have been described. Total antioxidant capacity using DPPH radical and total content of phenolic compounds by Folin–Ciocalteau method were measured in tea infusion. Synthesis of silver nanoparticles was carried out using chemical reduction at various temperatures. Furthermore, the effect of tea infusion volume added to reaction mixture on nanoparticles’ properties was investigated. Finally, nanosilver suspensions were characterized by UV–vis spectrophotometer, dynamic light scattering (DLS) scanning electron microscope (SEM) and transmission electron microscope (TEM). Moreover, phytotoxicity of silver nanoparticles was determined using Phytotestkit microbiotest.

Sunlight induced biosynthesis of silver nanoparticle from the bark extract of Amentotaxus assamica D.K. Ferguson and its antibacterial activity against Escherichia coli and Staphylococcus aureus

“…Many of these methods involve the use of harmful, costly and toxic substances and are eco-unfriendly [18]. Now a days emphasis has been given on the biosynthesis of the AgNPs which includes bacteria, fungi, essential oils [19], nucleic acid [20] yeast, algae and plant extract [21]. The latter has been given utmost importance for easily available, low maintenance [22], cost effective, less toxic and environmentally friendly properties [23].…”

Kinetics of 4-Nitrophenol Reduction with Black Tea Extract Conjugated Silver Nanoparticle Catalyst

“…Plant extracts are reported to be stabilizers and reducers in synthesizing nanoparticles, resulting in uniformly sized nanoparticles without forming aggregates [9]. Generally, plant extracts that contain polyphenols are suitable for use as conjugated ligands to stabilize the surface energy of nanoparticles [12]. Black tea contains polyphenol compounds theaflavin and thearubigins that are worthy of being proposed as conjugating agents in this study [13].…”

Tea Plant Leaves for Green Synthesis of Metallic Nanoparticles

“…The SEM studies revealed that the synthesized Ag‐NPs were spherical, and size nanoparticles were 27.3 nm. [ 61 ] The metal nanoparticle solutions were obtained by reacting AgNO3 aqueous solution with aqueous NaHCO 3 and tea leaf extracts silver nanoparticles prepared from the green tea were characterized using SEM and TEM, The synthesized nano crystallites of Ag were in the ≈30 nm. Then, cotton fabrics fixed with nanoparticles were prepared, which showed high antibacterial activity and distinctive color, showing potential for application as anti‐microbial dyes.…”