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Biosynthesis Products of Pseudomonas sp. PS-17 Strain Metabolites. 1. Obtaining and Thermal Characteristics

Ihor Semeniuk1, Viktoria Kochubei2, Volodymyr Skorokhoda2, Tetyana Pokynbroda1, Halyna Midyana1, Elena Karpenko1, Viktor Melnyk2
Affiliation: 
1 Department of Physical Chemistry of Fossil Fuels, L.M. Lytvynenko Institute of Physical Organic Chemistry and Coal Chemistry of the NAS of Ukraine 3a, Naukova St., 79060 Lviv, Ukraine 2 Lviv Polytechnic National University, 12, Bandery St., 79013 Lviv, Ukraine vskorohoda@yahoo.com
DOI: 
https://doi.org/10.23939/chcht14.01.026
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Abstract: 
Biogenic surfactants (rhamnolipid biocomplex, dirhamnolipid and exopolysaccharide) and polyhydroxyalkanoate biopolymer which are the new biosynthesis products of Pseudomonas sp. PS-17 strain have been obtained. The thermal transformation of these products has been studied in the air in the temperature range of 293–1273 K. Thermolysis and IR spectroscopy revealed a formation of rhamnolipid biocomplex between rhamnolipids and exopolysaccharide upon acidification of the culture fluid supernatant to pH = 3. Cellular polymer – polyhydroxyalkanoate – was identified by UV-Vis spectroscopy. According to the thermal analysis, the melting point and initial degradation temperature of polyhydroxyalkanoate were determined. Using the Vicat method, the heat resistance of the polymer was determined.
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