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Table 3 Summary of antibacterial activity of biosynthesized silver nanoparticles by Padina sp. against five pathogenic bacteria including gram-positive Staphylococcus aureus and Bacillus subtilis and gram-negative Pseudomonas aeruginosa, Escherichia coli, and Salmonella typhi with positive and negative control

From: Synthesis of silver nanoparticles using marine macroalgae Padina sp. and its antibacterial activity towards pathogenic bacteria

Concentration, mg/mlGram-positive organismGram-negative organism
Staphylococcus aureusBacillus subtilisPseudomonas aeruginosaEscherichia coliSalmonella typhi
0.2510.50 ± 0.507.00 ± 0.508.33 ± 0.297.50 ± 0.506.50 ± 0.50
0.5011.17 ± 0.298.17 ± 0.2910.00 ± 0.509.17 ± 0.298.00 ± 0.50
0.7512.50 ± 0.5010.67 ± 0.5812.00 ± 0.5011.17 ± 0.2910.00 ± 0.50
1.0015.17 ± 0.5812.67 ± 0.7613.33 ± 0.7612.67 ± 0.5811.50 ± 0.50
Standard (ampicillin)12.67 ± 0.2925.33 ± 0.7621.33 ± 0.7620.50 ± 0.8723.50 ± 0.50
0.01 M AgNO37.67 ± 0.586.83 ± 0.297.33 ± 0.298.17 ± 0.587.50 ± 0.50
Negative control0.000.000.000.000.00