Unraveling the bioenergy production potential of native Scenedesmus and Nannochloropsis species by ameliorating non-polar lipids and desirable fatty acid production

Thangavel Mathimani, Tht Le and Mysoon M. Al-Ansari

Renewable Energy, 2025, vol. 238, issue C

Abstract: This study investigated the biodiesel potential of aboriginal microalgal strains Scenedesmus sp. S01, Scenedesmus sp. S02, Nannochloropsis sp. S01, and Nannochloropsis sp. S02 under nitrogen-repletion (N+) and nitrogen-depletion (N-) conditions to minimize the energy sector's carbon footprint. Onset of the study, Nannochloropsis sp. S01 yielded higher biomass and chlorophyll of 1.41 g/L and 11.28 mg/g, respectively, over other species. Regarding macromolecules, Nannochloropsis sp. S01 had higher protein and lipid content of 37.09 % and 30 %, respectively, under the N+ condition, while it accumulated 34.27 % lipids in the N_ condition, of which non-polar lipids occupied 69 %. Among the Scenedesmus species, Scenedesmus sp. S02 showed high biomass, chlorophyll, and lipid content. The higher lipid-to-biodiesel conversion was noticed in Scenedesmus sp. S02, Nannochloropsis sp. S01 at about 71.02 %, which was further confirmed by FTIR. The biodiesel of all strains revealed palmitic acid as the most prevalent fatty type, accounting for between 30 and 37 %, and all species exhibited higher levels of SFAs between 37.21 and 46.54 %, followed by MUFAs (31–44 %) and low levels of PUFAs (8–20 %). Eventually, the mainstream fuel quality properties analyzed in this study, namely higher heating value, density, viscosity, oxidative stability, iodine value, and cetane number, satisfy the ASTM and EN biodiesel standards.

Keywords: Microalgae; Scenedesmus; Nannochloropsis; Biodiesel; Fatty acid; Biorefinery (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:238:y:2025:i:c:s0960148124020895

DOI: 10.1016/j.renene.2024.122021

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