METHOD OF INCREASING SENSITIVITY OF MICROORGANISMS TO ANTIMICROBIAL AGENTS

摘要

FIELD: biotechnology.SUBSTANCE: two suspensions are prepared. Clinical polyantibiotic-resistant strains Escherichia coli are added to an isotonic solution of NaCl to achieve the concentration of 30-40 thousand CFU/ml. Copper nanoparticles are added to the solution of NaCl to achieve the concentration of 0.01-0.05 mg/ml. The suspension of ethylenediaminetetraacetic acid - EDTA is prepared by its dilution in distilled water at the rate of 0.1-0.2:1, respectively. NaOH is added to the prepared suspension to obtain the solution of EDTA with pH=7.6-8. The prepared suspensions are connected with the solution of EDTA in the following ratios by wt %: suspension of copper nanoparticles - 70-85, suspension of microorganisms - 10-20, EDTA - 5.10. It is incubated in the shaker at 100-150 rev/min and a temperature of 36-38°C for 40-60 minutes. The resulting biomass is inoculated on the solid nutrient medium with the volume of 20-25 ml in the amount of 0.1-0.12 ml. It is incubated in the thermostat at a temperature of 36-38°C for 18-24 hours. The sensitivity of E.coli strains to antibiotics is determined.EFFECT: invention enables to increase the sensitivity of the said bacterial strains to antibiotics gentamicin and ampicillin.2 tbl, 2 cl, 1 ex