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Production of Omega-3 Fatty Acids from the Microalga Crypthecodinium cohnii by Utilizing Both Pentose and Hexose Sugars from Agricultural Residues
- Source :
- Fermentation; Volume 7; Issue 4; Pages: 219, Fermentation, Vol 7, Iss 219, p 219 (2021)
- Publication Year :
- 2021
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2021.
-
Abstract
- The core objective of this work was to take advantage of the unexploited wheat straw biomass, currently considered as a broadly available waste stream from the Greek agricultural sector, towards the integrated valorization of sugar streams for the microbial production of polyunsaturated omega-3 fatty acids (PUFAs). The OxiOrganosolv pretreatment process was applied using acetone and ethanol as organic solvents without any additional catalyst. The results proved that both cellulose-rich solid pulp and hemicellulosic oligosaccharides-rich aqueous liquid fraction after pretreatment can be efficiently hydrolyzed enzymatically, thus resulting in high yields of fermentable monosaccharides. The latter were supplied as carbon sources to the heterotrophic microalga Crypthecodinium cohnii for the production of PUFAs, more specifically docosahexaenoic acid (DHA). The solid fractions consisted mainly of hexose sugars and led to higher DHA productivity than their pentose-rich liquid counterparts, which can be attributed to the different carbon source and C/N ratio in the two streams. The best performance was obtained with the solid pulp pretreated with ethanol at 160 °C for 120 min and an O2 pressure of 16 bar. The total fatty acids content reached 70.3 wt% of dried cell biomass, of which 32.2% was DHA. The total DHA produced was 7.1 mg per g of untreated wheat straw biomass.
- Subjects :
- liquid fraction
Fermentation industries. Beverages. Alcohol
Biomass
Lignocellulosic biomass
solid pulp
Plant Science
Biochemistry, Genetics and Molecular Biology (miscellaneous)
Monosaccharide
Food science
Sugar
organosolv fractionation
lignocellulosic biomass
chemistry.chemical_classification
TP500-660
biology
Chemistry
microalgae
food and beverages
Crypthecodinium cohnii
Straw
biology.organism_classification
DHA
Docosahexaenoic acid
omega-3 fatty acids
Food Science
Polyunsaturated fatty acid
Subjects
Details
- Language :
- English
- ISSN :
- 23115637
- Database :
- OpenAIRE
- Journal :
- Fermentation; Volume 7; Issue 4; Pages: 219
- Accession number :
- edsair.doi.dedup.....30afd3d08fef05faabc07bc5b95f4efa
- Full Text :
- https://doi.org/10.3390/fermentation7040219