BACTERIOSTATIC ACTIVITIES OF ANTIOXIDANT SILVER NANOPARTICLES PREPARED FROM LEAVES OF JUSTICIA ADHATODA AND NYCTANTHES ARBOR-TRISTIS
Ishita Banik, Susmita Das, Sanchita Bhattacharjee, Sauryya Bhattacharyya* and Chandan Rai
ABSTRACT
Silver nanoparticles, prepared from leaf of Justicia adhatoda and
Nyctanthes arbor-tristis were tested for their antioxidant and
antimicrobial properties. Among the five standard antioxidant assay
protocols (viz. ABTS radical decolorization assay, DPPH radical
decolorization assay, assay for total phenolis content, FRAP assay and
hydroxyl radical scavenging assay) applied in the present study,
nanoparticles showed comparable antioxidant activities with the
aqueous leaf extracts. A probable chelation of the less polar
biomolecules with Ag+ ion during nanoparticle formation was also
indicated. Nanoparticle formation also improved the bacteriostatic
properties in terms of zone of inhibition against all the five bacteria
(viz. Escherichia coli, Klebsiella aerogens, Staphylococcus aureus, Salmonella typhi and
Bacillus cereus) tested in the study. Improvement in bacteriostatic activities of the
nanoparticles clearly indicated potential use of the nanoparticles against food borne bacteria
for application in favor of humans.
Keywords: Antioxidant, Bacteriostatic, Nanoparticles, Justicia adhatoda, Nyctanthes arbor-tristis.
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