Abstract
Comparison of antimicrobial and anti-adhesive activity of Nocardia vaccinii ІMV B-7405 surfactants synthesized on purified and technical glycerol (byproduct of biodiesel production). Surfactants were extracted from supernatant of cultural liquid by mixture of chloroform and methanol (2:1). Antimicrobial against bacteria and yeast properties of the surfactant was determined by index of the minimum inhibitory concentration (MIC). The number of attached cells was determined spectrophotometrically. The dependence of surfactant antimicrobial and anti-aghesive activity on the degree of glycerol purification (purified, technical), as well as the duration of N. vaccinii IMV B-7405 cultivation on these substrates was established. MIC against studied test cultures surfactants, synthesized on technical glycerol during 5 days, was 15–121 μg/ml, that lower than MIC of surfactant obtained on purified substrate (22.5−180 μg/ml). Increasing duration of N. vaccinii ІMV B-7405 cultivation accompanied by rise the MIC against some test cultures surfactants synthesized on both technical and purified glycerol. Adhesion of the bacteria Escherichia coli ІEM-1, Bacillus subtilis BT-2 (vegetative cells and spores) and the yeast Candida albicans Д-6 on abiotic surfaces treated with surfactants synthesized on technical glycerol for both 5 and 7 days, was an average of 11−12 % less than after materials treatment with surfactants obtained on the purified substrate. Increasing activity of NADP+-dependent glutamate dehydrogenase − key enzyme of aminolipids biosynthesis (effective antimicrobial and anti-adhesion agents) in the presence of K+ and Na+ may indicate the possibility of biosynthesis intensification of these components of surfacrants complex under N. vaccinii ІMV B-7405 cultivation on technical glycerol, which is characterized by a high content of sodium and potassium cations. Replacing refined glycerol on byproduct of biodiesel production will not only reduce the cost of N. vaccinii ІMV B-7405 surfactant biosynthesis, but also to obtain the final product with high antiadhesive and antimicrobial activity.
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