[Effect of lipolytic and catalase activity on physico-mechanical properties of coating Polyken 980-25]

Lipolytic and catalase activity of Pseudomonas pseudoalcaligenes 109, Rhodococcus erythropolis 102, Bacillus subtilis 138 and their association with different growth models: biofilm and plankton ones. It is shown that under biofilm conditions the fermentative activity of bacteria under study was 1.5-1.7 times higher than under plankton conditions. Monocultures of bacteria displayed much lower activity than associative ones. Changes of physico-chemical properties of the specimens of protective coating Polyken 980-25 with participation of the above bacteria have been studied. The coating breaking strength decreases by 5.9-11.8% under the effect of monocultures, and by 17.3% under the effect of association. The adhesive strength as the basic index of coating biologic resistance decreased, respectively, in mono- and associated cultures by 28.6-73.2% in respect of the control. Damaging the sticking layer of isolation coating, bacteria damage the adhesion to metal which favors its corrosion.