A method for obtaining colloidal solutions of silver nanoparticles, which includes obtaining aqueous solutions of argentum salt and extract from waste plant material, synthesis of a colloidal solution of silver nanoparticles by reducing silver from an aqueous solution of argentum salt when mixed with plant extract, which acts as a reducing agent and stabilizer of silver nanoparticles. The plant extract is obtained from waste plant material under conditions of ultrasonic extraction with simultaneous oxidation with air oxygen by bubbling and combined with an aqueous solution of argentum salt in a ratio of 1:1 wt. %.

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