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Antimicrobial activity of thin metallic silver flakes, waste products of a manufacturing process

Journal of Environmental Sciences 2011年第9期23卷 1570-1577页

作者： Manuela Anzano Alessandra Tosti Marina Lasagni Alfredo Campiglio Demetrio Pitea elena collina Department of Environmental Sciences University of Milano-Bicocca

The aim of the research was to develop new products and processes from a manufacturing waste from an Italian metallurgic *** company produced thin silver metallic films and the production scraps were silver *** possibility to use the silver flakes in water disinfection processes was *** antimicrobial activity of the flakes was investigated in batch using Escherichia coli as Gram-negative microorganism *** flakes did not show any antimicrobial activity,so they were activated with two different processes： thermal activation in reducing atmosphere and chemical activation,obtaining,respectively,reduced flakes （RF） and chemical flakes （CF）.The flakes,activated with either treatment,showed antimicrobial activity against *** kill rate was dependent on the type of activated *** chemical flakes were more efficient than reduced *** kill rate determined for 1 g of CF,1.0 ± 0.2 min ？1 ,was greater than the kill rate determined for 1 g of RF,0.069 ± 0.004 min ？1 .This was confirmed also by the minimum inhibitory concentration *** was demonstrated that the antimicrobial capability was dependent on flakes amount and on the type of aqueous ***,the flakes maintained their properties also when used a second ***,the antimicrobial activities of flakes were tested in an effluent of a wastewater treatment plant where a variety of heterotrophic bacteria were present.

关键词： metallic silver antimicrobial activity Escherichia coli activation reducing atmosphere waste recovery

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