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  • 1 Department of Pharmaceutical and Biological Engineering, School of Chemical Engineering, University of Sichuan, Chengdu 610065, People’s Republic of China
  • | 2 Division of Biotechnology, Dalian Institute of Chemical Physics CAS, Dalian 116023, People’s Republic of China
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Abstract

Mass–energy balance of lipid fermentation by oleaginous yeast Rhodosporidium toruloides Y4 with glucose as sole carbon source was investigated. The elemental composition of the freeze-dried cell samples obtained at different time points was determined using a Vario EL3 analyzer to estimate the biomass energetic yield (η). Then this work established the biomass energetic yield (η) to sets of biochemical variables and a new equation was developed to determine η without elemental composition of biomass. Biomass energetic yield estimated by the new equation was highly in accordance with that based on elemental composition. Bomb-calorimetric measurements were shown to be a direct method of quantifying the energy content of oleaginous yeasts. Combustion heat (Qc) of biomass determined experimentally was in consistent with those calculated according to its elementary contents. The relationship between lipid content and Qc of the cells was simulated and a new practical equation was developed based on lipid content (YL/S) to evaluate Qc of biomass. Biomass energetic yield of R.toruloides Y4 could reach higher than 0.8. Combustion heat of biomass obtained after 116 h was 33 (kJ g−1) that was about 73% of the combustion heat of diesel. The results revealed that R. toruloides Y4 was an efficient “energy-converter” in lipid production with glucose as the substrate. The results also implied the approaches to estimating η of fermentation, and Qc of single oil cells developed in this study should be valuable to address the overall techno-economical analysis of bio-energy production.

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  • SJR Quartile Score (2018): Q2 Condensed Matter Physics
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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
4
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)