Preparation of carboxy-methyl cellulose-capped nanosilver particles and their antimicrobial evaluation by an automated device

Abstract

Colloidal solution of nano silver particles (AgNPs) have been prepared using carboxymethyl cellulose as the stabilizing agent and dextrose as the reducing agent. It is considered bio-friendly, as all ingredients at much higher concentrations are used on eye as medicine. AgNPs thus generated are triangular with 9.5 nm size. MIC values of AgNPs and equivalent ionic silver against different multi-drug resistant strain bacteria and yeast are determined by microdilution method. Biological parameters for nano conversion are indicated by 128–256-fold higher sensitivity. Selective range synergisms for 1/4th MIC AgNPs with battery of antimicrobial agents are indicated by automated susceptibility testing device, keeping a negative control. Much lower MICs for different resistant antibiotics in combination with AgNPs are noted for all test organisms. This indicates scope for using a tolerable concentration of nanoantimicrobials either alone or in combination with an empirically chosen antibiotic for managing surface infections of eye or skin.