A comparative study of chemically synthesized and Camellia sinensis leaf extract-mediated silver nanoparticles
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Date
2019
Journal Title
Journal ISSN
Volume Title
Publisher
3 Biotech
Abstract
Silver nanoparticles (AgNPs) are amongst the most fascinating nanomaterials which have been extensively synthesized by
chemical reduction and biological method using enzymes, microorganisms and plant extracts. In our study, an aqueous extract
of green tea was used as a stabilizing and reducing agent for AgNPs synthesis. The synthesized AgNPs were characterized by
dynamic light scattering, UV–visible (UV–Vis) spectroscopy and scanning electron microscopy. These AgNPs were evaluated
for antimicrobial activity and photocatalytic dye degradation. The AgNPs showed antibacterial activity against E. coli,
S. aureus and S. pyogenes with 6 mm, 5 mm and 8 mm zone of inhibition, respectively. Our work also focused on methylene
blue degradation in aqueous solution using AgNPs as catalyst which shows 65% of dye degradation. An absorbance peak of
427–437 nm was observed using UV–Vis spectrophotometer. Our study proves that the AgNPs show potent antimicrobial
activity against pathogenic bacteria. At room temperature, AgNPs possess rapid, effective and steady catalytic activity in
cationic organic dye degradation. The high catalytic activity of AgNPs can be employed in industries and water purification.
Our study confirmed that green-synthesized AgNPs are eco-friendly and non-toxic.
Description
Keywords
Camellia sinensis · Silver nanoparticle · Catalytic degradation · Antibacterial activity