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Bioconversion of Agro-Residues into Microbial Oil-Based Oleochemicals Employing Packed Bed Bioreactor

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Listed:
  • Erminta Tsouko

    (Department of Food Science and Human Nutrition, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece)

  • Aikaterini Papadaki

    (Department of Food Science and Human Nutrition, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece)

  • Miguel Carmona-Cabello

    (Department of Physical Chemistry and Applied Thermodynamics, Universidad de Córdoba, Edificio Leonardo da Vinci, Campus de Rabanales, Campus de Excelencia Internacional Agroalimentario ceiA3, 14071 Cordoba, Spain)

  • MP Dorado

    (Department of Physical Chemistry and Applied Thermodynamics, Universidad de Córdoba, Edificio Leonardo da Vinci, Campus de Rabanales, Campus de Excelencia Internacional Agroalimentario ceiA3, 14071 Cordoba, Spain)

  • Denise Maria Guimarães Freire

    (Biochemistry Department, Chemistry Institute, Federal University of Rio de Janeiro, Av. Athos da Silveira Ramos 149, Bloco A, Lab 549, Rio de Janeiro 21941-909, Brazil)

  • Seraphim Papanikolaou

    (Department of Food Science and Human Nutrition, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece)

  • Apostolis A. Koutinas

    (Department of Food Science and Human Nutrition, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece)

Abstract

Lignocellulosic waste-streams are resources worth investigating to produce value-added bioproducts due to their low-cost, renewability, versatility, and abundance. This study evaluated five Zygomycota strains as potential oleaginous microorganisms for direct bioconversion of cakes derived from the vegetable-oil-milling industry into microbial oil. Solid-state fermentation (SSF) conditions in tray bioreactors revealed that temperature, moisture content, and substrate affected lipid production and fatty acids composition. Employing SSF, under optimal conditions (30 °C, 65% initial moisture content), and substrate supplementation with nitrogen sources increased lipid productivity 1.1-fold on palm kernel cake (PKC) substrate. Supplementation strategies using glycerol, molasses, or mineral solution did nοt favor lipid production. When cotton seed cake (CoSC) was applied, C. echinulata was able to produce 304.1 mg/gfs of biomass with a lipid content of 40.2% ( w / w ) in tray bioreactors. Scaling-up SSF using CoSC in packed bed reactors led to the highest biomass production (320.5 mg/gfs), while lipids production was unaffected. Then, microbial oil was enzymatically converted into polyol esters achieving the highest conversion yield of 80% after 2 h. Physicochemical properties of polyol esters demonstrated their potential utilization as biolubricants. The present study showed the perspective of bioconverting industrial side streams into microbial oil and a route for sustainable synthesis of oleochemicals.

Suggested Citation

  • Erminta Tsouko & Aikaterini Papadaki & Miguel Carmona-Cabello & MP Dorado & Denise Maria Guimarães Freire & Seraphim Papanikolaou & Apostolis A. Koutinas, 2022. "Bioconversion of Agro-Residues into Microbial Oil-Based Oleochemicals Employing Packed Bed Bioreactor," Sustainability, MDPI, vol. 14(21), pages 1-22, October.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:21:p:14135-:d:957294
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    References listed on IDEAS

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    1. Ho, Calvin K. & McAuley, Kimberley B. & Peppley, Brant A., 2019. "Biolubricants through renewable hydrocarbons: A perspective for new opportunities," Renewable and Sustainable Energy Reviews, Elsevier, vol. 113(C), pages 1-1.
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