The invention relates to a method for preparing a complex
antimicrobial agent by blending
chitosan and
silver copper. The method comprises the following steps:
silver nitrate and
cupric nitrate are blended according to the
concentration ratio of 1:30 to 1:80, and then are blended with
chitosan. Therefore, a light blue
antibacterial agent powder is prepared. According to the method provided by the invention, the usage amount of silver is reduced, the
chitosan is also used as a
reducing agent, chemical reagents are no longer added, and the
toxicity of an
antibacterial agent is reduced. Due to the change of technological conditions, the oxidation-reduction reaction of the chitosan and the
cupric nitrate can be performed sufficiently, an
aldehyde group (-CHO) is generated in the reaction, Ag<+> is enabled to be completely reduced to elemental silver, Cu<2+> is hibernated in a chitosan
basal body, so as to play a synergistic
antibacterial effect, a remarkable inhibiting effect on
escherichia coli and
staphylococcus aureus is detected through an inhibition ring test, an inhibition ring which is equal to or greater than 10 mm is formed under a culture condition of 37 DEG C, a remarkable bacteriostatic effect is played, materials used cause no harm to
human body, the price is low, and the novel complex
antimicrobial agent is green and environment-friendly.