Fig. 4.

SA inhibition zone of silver nanoparticles at three concentrations

(a) The inhibition zone of QLD-Ti: 1, AgNPs concentration of 10 μmol/L; 2, AgNPs concentration of 4 μmol/L; 3, AgNPs concentration of 2 μmol/L. (b) The inhibition zone of QLD-Co: 1, AgNPs concentration of 10 μmol/L; 2, AgNPs concentration of 4 μmol/L; 3, AgNPs concentration of 2 μmol/L. (c) Control group: 1, the positive control group of penicillin; 2, the negative control group of QLD-Ti; 3, the negative control group of QLD-Co