On MEA, the highest level of inhibition was observed against M-1 (Table 3,Fig. 1) treated with a 25 ppm concentration of AgNPs (94.1%), and no inhibition was observed with treatment at 10 and 25 ppm concentrations of AgNPs against P-9. In addition, treatment with a 100 ppm concentration of AgNPs resulted in 90% inhibition against M-1 on MEA.