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Open AccessArticle

Liquid Anaerobic Digestate as a Source of Nutrients for Lipid and Fatty Acid Accumulation by Auxenochlorella Protothecoides

Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland
Author to whom correspondence should be addressed.
Academic Editors: Cristina González-Fernandez and Luisa Gouveia
Molecules 2019, 24(19), 3582;
Received: 12 September 2019 / Revised: 2 October 2019 / Accepted: 3 October 2019 / Published: 4 October 2019
(This article belongs to the Special Issue Microalgae for Production of Bioproducts and Biofuels)
In recent years, there has been growing interest in the biomass of unicellular algae as a source of valuable metabolites. The main limitations in the commercial application of microbial biomass are associated with the costs of production thereof. Maize silage is one of the main substrates used in biogas plants in Europe. The effects of sterilized agricultural liquid digestate (LD) from methane fermentation of maize silage on the growth rates, macro and micronutrient removal efficiency, lipid content, and fatty acid profile in Auxenochlorella protothecoides were investigated. The results indicate that A. prothecoides can proliferate and accumulate lipids with simultaneous reduction of nutrients in the 1:20 diluted liquid digestate. The rate of nitrogen and phosphorus removal from the liquid digestate was 79.45% and 78.4%, respectively. Cells growing in diluted liquid digestate exhibited the maximum lipid content, i.e., 44.65%. The fatty acid profile of A. prothecoides shows a decrease in the content of linolenic acid by 20.87% and an increase in oleic acid by 32.16% in the LD, compared with the control. The liquid digestate changed the content of monounsaturated fatty acids and polyunsaturated fatty acids. The cells of A. protothecoides growing in the liquid digestate were characterized by lower PUFA content and higher MUFA levels. View Full-Text
Keywords: biomass; microalgae; agriculture; wastewater; methane fermentation biomass; microalgae; agriculture; wastewater; methane fermentation
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Krzemińska, I.; Oleszek, M.; Wiącek, D. Liquid Anaerobic Digestate as a Source of Nutrients for Lipid and Fatty Acid Accumulation by Auxenochlorella Protothecoides. Molecules 2019, 24, 3582.

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