Faculty of Biology, University of Latvia
Hard copy: ISSN 1691–8088
On-line: ISSN 2255–9582
Env Exp Biol (2014) 12: 15–27
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Environmental and

Env Exp Biol (2014) 12: 15–27

Orginal Articles

Production of fatty acids by Mortierella and Umbelopsis species isolated from temperate climate soils

Lelde Grantina-Ievina1*, Asja Berzina1, Vizma Nikolajeva1, Peteris Mekss2, Indrikis Muiznieks1
1Department of Microbiology and Biotechnology, Faculty of Biology, University of Latvia, Kronvalda bulvaris 4, Riga LV-1586, Latvia
2Department of Analytical Chemistry, Faculty of Chemistry, University of Latvia, Kr. Valdemara 48, Riga LV-1013, Latvia
*Corresponding author, E-mail: lelde.grantina-ievina@lu.lv


Soil fungi from the genera Mortierella and Umbelopsis are known as effective producers of polyunsaturated fatty acids, among which industrially the most important is arachidonic acid. Primary screening for the best arachidonic acid producers was conducted on malt extract with gelatin and potato dextrose agar with or without aspirin. Only five isolates were able to grow on potato dextrose agar with aspirin. They did not contain arachidonic acid but they produced relatively high amounts of other unsaturated fatty acids such as oleic and linoleic acids. All isolates producing arachidonic acid produced also lignoceric acid. From all tested liquid media the highest yield of arachidonic acid and total yield of fatty acids was obtained using medium containing soybean powder. Some of the isolates produced higher amounts of total fatty acids and arachidonic acid in media containing fewer amounts of carbon sources and at low incubation temperature.

Key words: arachidonic acid; fatty acid; lignoceric acid; Mortierella; Umbelopsis.

Env Exp Biol (2014) 12: 15–27
 DOI: http://doi.org/10.22364/eeb

Prof. Gederts Ievinsh
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