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Microbial Oil Production from Alkali Pre-Treated Giant Reed ( Arundo donax L.) by Selected Fungi

Stefano Cianchetta, Enrico Ceotto and Stefania Galletti (stefania.galletti@crea.gov.it)
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Stefano Cianchetta: Research Centre for Agriculture and Environment, Council for Agricultural Research and Economics, Via di Corticella 133, 40128 Bologna, Italy
Enrico Ceotto: Research Centre for Animal Production and Aquaculture, Council for Agricultural Research and Economics, Via Beccastecca 345, 41018 San Cesario sul Panaro, Italy
Stefania Galletti: Research Centre for Agriculture and Environment, Council for Agricultural Research and Economics, Via di Corticella 133, 40128 Bologna, Italy

Energies, 2023, vol. 16, issue 14, 1-24

Abstract: This study aimed to evaluate the microbial oil production by three selected strains, Mortierella isabellina , Cunninghamella echinulata , and Thamnidium elegans , after fermentation of an enzymatic hydrolysate from alkali pre-treated giant reed biomass, in comparison to a semi-synthetic medium, at three increasing nitrogen supplementation levels (0.14, 0.25, and 0.47 g/L). M. isabellina showed the fastest sugar consumption, the highest final cell and oil concentrations (10.9 and 5.6 g/L, respectively), as well as the highest cellular oil content, oil yield/g sugar consumed, and oil productivity (63.4%, 0.19 g/g, and 1 g/L/day, respectively) in the giant reed hydrolysate. The oil yield tended to decrease with an increasing nitrogen content in the cultures. Oleic acid was the most copious fatty acid in the oil for all the fungi. On the contrary, T. elegans exhibited the poorest performances. In particular, M. isabellina showed, respectively, the highest and lowest values of oleic and γ-linolenic acid (52.2 and 3.1%, on average). In comparison, C. echinulata and T. elegans showed much higher γ-linolenic acid content (15.3 and 21.6%, on average). Notably, the C. echinulata cultures showed by far the highest γ-linolenic acid concentration in both substrates (345 and 595 g/L in the giant reed hydrolysate and in the synthetic medium, respectively). Finally, the estimated biodiesel properties of all the oils fell within the limits of the U.S. standards, while the oil of M. isabellina only respected the tighter limits fixed by the E.U. regulations.

Keywords: Mortierella isabellina; Thamnidium elegans; Cunninghamella echinulata; biodiesel; linolenic acid (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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