The present investigation details a green synthesis of silver nanoparticles
(AgNP) using the essential oil of Syzygium
aromaticum L. (clove) as reducing agent, which is a matrix with a high
content of eugenol, an important compound for the reducing action of silver
nitrate. The synthesis of AgNP was performed at different pH conditions (pH 7,
8, 9 and 10), and was monitored by UV-Vis Spectroscopy, Dynamic Light
Scattering (DLS) and Transmission Electron Microscopy. The synthesized nanoparticles
presented characteristic Surface Plasmon Resonance bands with maximum
absorbance between 405 and 460 nm. The DLS analysis revealed particle sizes
from 31 to 72 nm and zeta potential between -30.1 and -50.8 mV indicating good stability against the agglomeration of the
particles in solution. The micrographs obtained by TEM showed different particle shapes and a predominance of
spherical-shaped nanoparticles, and average size ranging from 27 to 94
nm. The clove-based silver nanoparticles were efficient in controlling the
growth of Escherichia coli and Staphylococcus aureus bacteria, and the
minimum inhibitory concentration ranged from 60 to 100 μL/mL. This study
highlights the feasibility of clove essential oil as an alternative for the
synthesis of silver nanoparticles by a simple, inexpensive and eco-friendly
method.
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