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Table 2 Antimicrobial activity of colloidal AgNPs against various species of pathogenic bacteria, yeast and molds

From: Enzyme-mediated formulation of stable elliptical silver nanoparticles tested against clinical pathogens and MDR bacteria and development of antimicrobial surgical thread

Sr. no. Microorganisms ZOI of 20 μl of AgNPs (mm) (y) ZOI of 20 μl of 1 mM AgNO3 (mm) (x) ZOI of 20 μl of H2O (mm) Increase in the ZOI area (%)a
1 E. coli 12.66 ± 0.28 11.00 ± 0.0 0 ± 0 32.45
2 S. pneumoniae 14.33 ± 0.57 13.16 ± 0.28 0 ± 0 18.57
3 K. pneumonia 14.16 ± 0.28 13.0 ± 0.5 0 ± 0 18.64
4 P. vulgaris 14.00 ± 0.5 12.33 ± 0.28 0 ± 0 28.92
5 S. aureus 15.0 ± 0.0 13.16 ± 0.28 0 ± 0 29.91
6 P. aeruginosa 15.5 ± 0.5 13.5 ± 0.5 0 ± 0 31.82
7 B. cereus NCIM 5557 12.50 ± 0.5 11.16 ± 0.28 0 ± 0 25.45
8 B. megaterium NCIM 5334 15.33 ± 0.28 13.5 ± 0.5 0 ± 0 28.94
9 M. luteus NCIM 5262 15.5 ± 1.0 14.0 ± 0.5 0 ± 0 22.57
10 B. subtilis NCIM 2920 16.0 ± 1.0 14.0 ± 0.5 0 ± 0 30.61
11 C. albicans 12.0 ± 0.0 11.16 ± 0.28 0 ± 0 15.62
12 A. niger NCIM 1358 13.16 ± 0.28 11.0 ± 0.5 0 ± 0 43.12
13 M. racemosus NCIM 1334 13.0 ± 0.5 11.33 ± 0.28 0 ± 0 31.65
14 P. chrysogenum NCIM 1333 14.0 ± 1.0 10.0 ± 0.5 0 ± 0 96.00
15 R. stolonifer NCIM 1139 14.0 ± 1.0 12.5 ± 1.0 0 ± 0 25.44
  1. All experiments were performed in triplicate
  2. aThe mean surface area of the growth inhibition zone (mm2) was calculated for AgNPs and AgNO3 from the mean diameter. The percent of increases of inhibition zone area for the AgNPs against different microorganism were calculated as (y2−x2)/x2 × 100, where x and y are the inhibition zone for 20 μl of AgNO3 and 20 μl of AgNPs respectively
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