Biological Systems: Theory and Innovation

Resistance of E. coli to nanodispersed systems, obtained on the basis of vegetal extracts and silver nitrate, has been determined in liquid nutrient medium. Vegetal extracts got by water maceration of berry pomaces with ultrasound treatment. Zeta potential of obtained AgNPs were in a band from -15 to -24 mV and average sizes of particles were 80-92 nm. An microbial ac on of silver nanosystems was tested in 10- times reiterative; the statistical processing of results involved using S-criterion for rejecting gross errors and calculating the average value of suspension optical density with mean square deviation. Control absence of growth was performed on Endo agar. Silver nanosystems on grape crests and pomace, and currant pomace extracts were stable and active against E. coli UKM В-906. The minimal bactericidal concentration is 7,5% for the silver nanosystem on grape extract, and 10% for currants extract. Minimal inhibitory concentration are 3,5% and 4,2% correspondently

silver nanoparticles; berry pomace extract; E. coli; minimal bactericidal concentration; minimal inhibitory concentration