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Simultaneous Lipid Production and Valorization of Crude Glycerol by Mixotrophic and Heterotrophic Cultivation of Arthrospira platensis


Affiliations
1 Graduate School of Natural and Applied Sciences, Department of Biotechnology, , Dokuz Eylül University 35 160 Buca, Izmir, Turkey
2 Faculty of Science, Department of Chemistry Biochemistry Division, Dokuz Eylül University 35 160 Buca, Izmir, Turkey

This study investigates the possible use of crude glycerol as external carbon source for mixotrophic and heterotrophic cultivation of Arthrospira platensis for the purpose of producing lipid. Recently, biodiesel has become a remarkable biofuel while cyanobacterial lipid is an alternative feedstock for biodiesel production. In this study effect of carbon source concentration, trophic culture type on production of biomass, chlorophyll, protein, total carbohydrate and lipid were examined. In terms of total lipid content, the highest value was detected as 5.78 ± 0.21 mg/g cell with 10 mM crude glycerol in mixotrophic cultivation on 18th day. Higher specific growth rates were detected in mixotrophic cultures. The fatty acid composition was detected by gas chromatography. The produced lipid had the basic fatty acids for a quality biodiesel production — palmitic, stearic, oleic and linoleic acids. The biodiesel potential of produced lipid was investigated. The indicator of oxidative stability of the fuel, iodine value was in accordance with UNE-EN 14214. Cetane number and oxidative stability are related to productive combustion characteristics of fuel which comply with ASTM 6751 standards. These results show that the fatty acid composition of the produced lipid, from a waste material via economical fermentation, is suitable for a qualitative fuel production.
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  • Simultaneous Lipid Production and Valorization of Crude Glycerol by Mixotrophic and Heterotrophic Cultivation of Arthrospira platensis

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Authors

Zulfiye Velioglu Tosuner
Graduate School of Natural and Applied Sciences, Department of Biotechnology, , Dokuz Eylül University 35 160 Buca, Izmir, Turkey
Raziye Ozturk Urek
Faculty of Science, Department of Chemistry Biochemistry Division, Dokuz Eylül University 35 160 Buca, Izmir, Turkey

Abstract


This study investigates the possible use of crude glycerol as external carbon source for mixotrophic and heterotrophic cultivation of Arthrospira platensis for the purpose of producing lipid. Recently, biodiesel has become a remarkable biofuel while cyanobacterial lipid is an alternative feedstock for biodiesel production. In this study effect of carbon source concentration, trophic culture type on production of biomass, chlorophyll, protein, total carbohydrate and lipid were examined. In terms of total lipid content, the highest value was detected as 5.78 ± 0.21 mg/g cell with 10 mM crude glycerol in mixotrophic cultivation on 18th day. Higher specific growth rates were detected in mixotrophic cultures. The fatty acid composition was detected by gas chromatography. The produced lipid had the basic fatty acids for a quality biodiesel production — palmitic, stearic, oleic and linoleic acids. The biodiesel potential of produced lipid was investigated. The indicator of oxidative stability of the fuel, iodine value was in accordance with UNE-EN 14214. Cetane number and oxidative stability are related to productive combustion characteristics of fuel which comply with ASTM 6751 standards. These results show that the fatty acid composition of the produced lipid, from a waste material via economical fermentation, is suitable for a qualitative fuel production.