sulfate-reducing bacteria

The paper describes the synthesis of a set of new 2,3-dihydroimidazo[1,2-a]pyridinium bromides which demonstrate antibacterial properties against sulfate-reducing bacteria of Desulfomicrobium and Desulfovibrio strains and inhibit their functioning in the binary culture under the steel microbial corrosion. The compounds demonstrate antibiofilm and anticorrosive properties in the medium with sulfate-reducing bacteria, steel anticorrosion rate is up to 70.6 %.

It has been showed that food additives E451 and E459 inhibit corrosion in neutral water-salt medium and additives E316, E631, E621, E631+E551, herbs and spices increased it up to 1.75 times. Under microbial corrosion condition, inducted by sulfate-reducing bacteria, inhibition action (up to 80.9%) was discovered only for additive E459. Other studied additives increased microbial corrosion up to 2.27 times. The presence of food additives in corrosive medium influences the quantity of sulfate-reducing bacteria in biofilm on steel surface.

New derivatives of N-(R-phenyl)-3-(4-methyl-1-piperazinyl)-1,3-thiazole-2(3H)- imine with the medium to high yields were synthesized by the Hantzsch reaction in the ethanol medium. The structure of target compounds was confirmed by elemental analysis and NMR spectroscopy. The antimicrobial activity of 1,3-thiazoline derivatives with the N-methylpiperazine moiety against sulfate-reducing bacteria of Desulfovibrio sp. М.4.1 strain was studied.

On the metal sewage treatment constructions (Chernihiv, Ukraine) a biofilm is formed, which is corrosive because of the number of sulfate-reducing bacteria (107 cell/cm2). By affecting sulfate-reducing activity of microorganisms, pyridinium chlorides at the concentration of 0.5 g/l were revealed to provide St3ps steel inhibition efficiency of up to 98.7 % under the corrosion caused by biofilm bacteria.