AURORA PETICA,  CARMEN GAIDAU*, JA MA, DEMETRA SIMION, QU XU, MIHAELA NICULESCU<br>Antimicrobial Electrochemically Obtained Nanosilver <br>Solutions for Leather and Furskin Treatment

AURORA PETICA, CARMEN GAIDAU*, JA MA, DEMETRA SIMION, QU XU, MIHAELA NICULESCU
Antimicrobial Electrochemically Obtained Nanosilver
Solutions for Leather and Furskin Treatment

Abstract:

The silver nanoparticles (AgNps) with antibacterial and antifungal properties against a great number of bacteria and fungi may be used in form of colloidal sols or doping agents for a lot of composite materials with polymer matrix. AgNps as ecological alternative for organic biocides represent an innovative challenge for treatment of collagen and keratin based materials such as leather and furskin. Using an efficient and innovative electrochemical method, colloidal silver solutions (CSSs) containing up to 45 ppm Ag with AgNps smaller than 10 nm and Zeta potential values between - 40 ÷ - 50 mV, which indicates very stable solutions, were obtained and used for treatment of leathers and furskins. Bacteriostatic and bactericidal effect of the CSSs was evaluated by measuring minimal concentration with bacteriostatic effect - MCBs and minimal concentration with bactericidal effect - MCBc against Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa. Also, the fungistatic properties were evaluated and the results were very good. Leather and furskin treated by immersion in CSSs, with a content of 820 ppm Ag for chromium-tanned, 760 ppm Ag for metal-free leathers and 160 ppm for furskin have displayed resistance against some important bacteria such as E.coli, P. aeruginosa or S. aureus. The exposure of the leathers and furskins to a mix of fungi (A.niger, T.viride, P. glaucum, S. brevicaulis and P. variotii) has shown a good resistance after 7 days, better in the case of leathers. To demonstrate the way in which AgNps are present and distributed on treated leather surface, as a result of the interaction with processed leather, and of the correlation with antimicrobial resistance, Ag content and valence state were analyzed by atomic absorption spectroscopy (AAS) and X-ray photoelectron spectroscopy (XPS). Keywords: electrochemical syntheses, silver nanoparticles, colloidal silver solution, antimicrobial leather and furskin

Issue: 2013, Volume 64, Issue 11

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