The antimicrobial activity of the SNPwas carried out by thewell diffusion
method according to the protocol as discussed in the previous
section. Fig. 6 shows that SNPs exhibit a good antibacterial activity
against both Gram-negative and Gram-positive bacteria. The control
(with deionized water) also exhibited zero zone of inhibition (ZI). The
plates show that SNPs have higher antibacterial activity against E. coli
(Gram-negative) over S. aureus (Gram-positive). From the image we
can also observe that, SNP synthesized using 0.02 M did not show any
antibacterial activity, whereas the SNPs of 0.05 M and 0.1 M exhibited
good ZI in both the cases.When the ZIwas comparedwith the standard
drug (ampicillin), it was found that both 0.05Mand 0.1MSNPs were as
strong as the standard drug respectively. Table 3 shows in detail the ZI
measurements as calculated using a Vernier caliper along with their respective
controls. The controls (deionized water) also did not show any
ZI indicating that the procedure was correctly executed. In this study,
the lowest concentration of SNPs (0.02 M = 0.107 mg/L) showed