Abstract
The lipogenic ability of the yeast Solicoccozyma terricola DBVPG 5870 grown on hydrolyzed lignocellulose obtained from cardoon stalks was evaluated. Data on cell biomass, lipid production, and fatty acid profiles of triacylglycerols obtained in batch and fed-batch experiments were carried out at the laboratory scale in a 5L fermenter, and at two different temperatures (20 and 25 °C) were reported. The higher production of total intracellular lipids (13.81 g/L) was found in the fed-batch experiments carried out at 20 °C. S. terricola exhibited the ability to produce high amounts of triacylglycerol (TAGs) with a characteristic fatty acids profile close to that of palm oil. The TAGs obtained from S. terricola grown on pre-treated lignocellulose could be proposed as a supplementary source of oleochemicals. Indeed, due to the rising prices of fossil fuels and because of the environmental-related issues linked to their employment, the use of TAGs produced by S. terricola grown on lignocellulose could represent a promising option as a supplementary oleochemical, especially for biodiesel production.
Highlights
The increasing level of greenhouse gas emissions and the depletion of fossil fuel reserves are among the major concerns in the energy sector [1,2]
No significant (p > 0.05) differences were found between the lipogenic aptitudes exhibited by S. terricola in batch experiments performed at 20 and 25 ◦ C (Table 1), while significant (p < 0.05) differences emerged between the fed-batch experiments carried out at the two different temperatures
In light of the results reported, the possibility of using lipids produced by oleaginous yeasts from pre-treated lignocelluloses obtained from cardoon stalks as sustainable and cheap extra-source of oils could be regarded as a realistic chance, in view of the rising global request of oleochemicals and biofuels obtained from biotechnological processes [60,61]
Summary
The increasing level of greenhouse gas emissions and the depletion of fossil fuel reserves are among the major concerns in the energy sector [1,2]. The excessive consumption of fossil fuels has elevated in the recent decades the average temperature of the Earth, causing severe impacts on terrestrial ecosystems and biological diversity [3]. In this regard, one of the objectives proposed by major world organizations for the mitigation of the effects of global warming is the research of alternative renewable energy sources. Biofuels have been considered promising substitutes of fossil fuels for mitigating the impact of greenhouse gas emissions [4,5] They are classified based on their physical/chemical properties, nature, and biotechnological processes [6,7], and include bioethanol, biobutanol, biodiesel, and biogas [8]. Some yeasts exhibit advantages for lipid production over other oleaginous microorganisms, mainly due to their shorter duplication times, easier cultivation in large-scale fermenters, and rapid
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