Mikrobiol. Z. 2018; 80(4):13-27. Ukrainian.
Influence of Cultivation Conditions of Rhodococcus erythropolis IMV Ac-5017
on the Properties of Synthesized Surfactants
Pirog T.P.1,2, Shevchuk T.A.2, Petrenko N.M.1, Paliichuk O.I.1, Iutynska G.O.2
1National University of Food Technologies
68 Volodymyrska Str., Kyiv, 01601, Ukraine
2Zabolotny Institute of Microbiology and Virology, NAS of Ukraine
154 Akad. Zabolotny Str., Kyiv, 03143, Ukraine
Aim. To establish cultivation conditions of Rhodococcus erythropolis IMV Ac-5017, which provide the synthesis of surfactants with high antimicrobial and antiadhesive activity, as well as high efficiency of oil pollution destruction. Methods. Surfactants were extracted from supernatant of cultural liquid by mixture of chloroform and methanol (2 : 1). The number of attached cells and the degree of biofilm destruction were analyzed spectrophotometrically. Antimicrobial properties of the surfactants were determined by index of the minimum inhibitory concentration. The degree of oil destruction was analyzed by its residual concentration, which was determined by the weight method after extraction with hexane. Results. It has been established that cations of calcium are the activator of NADP+-dependent glutamate dehydrogenase (key enzyme of biosynthesis of surfaceactive aminolipids in R. erythropolis IMV Ac-5017). The addition of CaCl2 (0.1 g/l) into cultivation medium of IMV Ac-5017 strain was accompanied by increasing NADP+- dependent glutamate dehydrogenase activity in 2 time and by synthesis of surfactants, the minimum inhibitory concentrations of which with respect to the test cultures were 1.2 − 5 times lower, their adhesion on abiotic materials treated with such surfactants was 12 − 50 % lower, and the degree of biofilms destruction was on average 9 − 10 % higher as compared to indicators for the surfactant produced in the base medium. The introduction of 0.1 mM Cu2+ (activator of alkane hydroxylase - first enzyme of n-alkanes catabolism) in exponential growth phase of IMV Ac-5017 strain on non-hydrocarbon substrates (ethanol, waste oil) was accompanied by formation of surfactants, in the presence of which degree of oil decomposition increased by 8 − 13 % compared with using preparations synthesized in a medium without copper cations. Conclusions. The data presented indicate the possibility of regulating properties of surfactants under producer cultivation. The determining mechanisms underlying this regulation allows development of technologies for production of microbial surfactants, providing synthesis of final product with the necessary predetermined properties, depending on sphere of practical application.
Keywords: Rhodococcus erythropolis IMV Ac-5017, surfactants, antimicrobial and antiadhesive activity, key enzymes, oil degradation.
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