Abstract
Abstract In this research, the impact of chemical agents on the growth of Euglena gracilis and contaminants (S. cerevisiae and B. subtilis) in different cultivation media was studied. E. gracilis was cultivated on modified Hutner and complex medium in Erlenmeyer flasks and a stirred tank bioreactor. H2O2 and antimycin were used as suppressors of contaminant growth activities during algae cultivation. The use of antimycin as a chemical suppressor of contaminants is not recommendable because of its significant impact on the E. gracilis growth. At a H2O2 concentration of 5 mg L-1 contaminant growth activities were almost completely suppressed. In these conditions, E. gracilis is capable to grow, but a further increase of H2O2 concentration is related to significant reduction of algae growth. H2O2 as a suppressor of contaminants has great potential for industrial application, but its optimal concentration for a particular bioprocess has to be determined in order to obtain the maximal bioprocess efficiency.
Highlights
The microalgae Euglena gracilis is a well studied microorganism
On the basis of obtained results it can be concluded that complex medium can be successfully used as a substitute for chemically defined Hutner medium
This observation is confirmed by the similar values of bioprocess efficiency parameters for E. gracilis cultivation on both media
Summary
The microalgae Euglena gracilis is a well studied microorganism It has great nutritional value because it contains valuable proteins in high concentrations (Murakami et al, 1998), polyunsaturated fatty acids, β-carotene, and vitamins C and E (Ogbona et al, 1998) among others. This microalgae is mostly recognized for paramylon (β-1,3-glucan) production. E. gracilis is capable of growing on several carbon sources and it has even been shown that it can grow on potato liquor and corn steep solids based media The aim of these studies was to define simple and inexpensive complex media suitable for large scale heterotrophic cultivation of
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