ANTIMICROBIAL ACTIVITY OF SUPERPHOSPHATES WITH A VIEW OF THEIR APPLICATION FOR DECONTAMINATION OF ORGANIC FERTILIZERS

Teodora P. Popova

Abstract: Studies to determine the antimicrobial effect of nitric monoammonium and diammonium phosphate were performed. The minimum inhibitory concentrations (MIC) and the zones of growth inhibition in the agar diffusion method for various Gram-positive and Gram-negative organisms. Eighteen pathogenic bacterial strains belonging to the species Salmonella enterica, Pseudomonas aeruginosa, Staphylococcus aureus, Streptococcus pyogenes, Paenibacillus alvei and Candida albicans were used. Sensitivity of microorganisms to both nitrogen compounds was established. It was better expressed in Gram-positive bacteria tested. Mean diameters of the zones of growth inhibition were 15.8 ± 1.0 for mono- and 18.4 ± 8.9 for diammonium phosphate. The results of the two methods used showed that a better antimicrobial effect manifested diammonium phosphate. Mean MIC50 of that compound were 271.0 ± 153.0, while MIC50 of monoammonium phosphate were higher – 382.2 ± 140.8.

Keywords: diammoniumphosphate; minimum inhibitory concentrations; monoammoniumphosphate

Date published: 2023-01-03