Page 68 - 2019

M.Phil
(Sciences)
SYNTHESIS OF SILVER NANOPARTICLES (AgNPs) BY UTILIZING
EXTRACT OF PSIDIUM GUAJAVA

Ph.D. Scholar : Ms. Yesha Desai
Research Supervisor : Dr. Keyur D. Bhatt

Regi. No.: 18065151001
Abstract :
The synthesis of silver nanoparticles (AgNPs) by utilizing extract of Psidium guajava. In
this study leaf was with extricated alcohol, further this extract is utilized for the
preparation of nanoparticles followed by treatment with silver nitrate solution. Color
change from colorless to dark-yellow and SPR band (UV-Vis) 420 nm which indicates the
synthesis of plant reduced silver nanoparticles. The presences of proteins as capping
agent, which increase the stability of AgNPs in the colloids, are characterized by Fourier
Transform Infrared Spectroscopy (FTIR). Transmission electron microscopy (TEM)
demonstrated the presence at spherical AgNPs in the range of 15-30nm. The bactericidal
activity of standard antibiotics was essentially expanded in the presence of AgNPs
against pathogenic bacteria, S.Aureus, Staphylococcus, EColi, P.Putida and fungus
A.Niger.
Keywords: Silver nanoparticles, SPR, TEM, Psidium guajava, Antimicrobial activity and IR

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