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Production of renewable lipids by the diatom amphora copulata

Natanamurugaraj, Govindan and Maniam, Gaanty Pragas and Mohd Hasbi, Ab. Rahim and Ahmad Ziad, Sulaiman and Azilah, Ajit and Chatsungnoen, Tawan and Chisti, Yusuf (2021) Production of renewable lipids by the diatom amphora copulata. Fermentation, 7 (1). pp. 1-21. ISSN 2311-5637

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The asymmetric biraphid pennate diatom Amphora copulata, isolated from tropical coastal waters (South China Sea, Malaysia), was cultured for renewable production of lipids (oils) in a medium comprised of inorganic nutrients dissolved in dilute palm oil mill effluent (POME). Optimal levels of nitrate, phosphate, and silicate were identified for maximizing the biomass concentration in batch cultures conducted at 25 ± 2 °C under an irradiance of 130 µmol m−2 s−1 with a 16 h/8 h light-dark cycle. The maximum lipid content in the biomass harvested after 15-days was 39.5 ± 4.5% by dry weight in a POME-based medium with optimal levels of nitrate, phosphate, and silicate. Under the optimized conditions the maximum dry mass concentration of the diatom was 660 mg L−1 on day 12, declining to ~650 mg L−1 on day 15. For the 15-day batch operation, the final average productivities of the biomass and the lipids were 43.3 ± 4.5 mg L−1 d−1 and 17.1 ± 0.3 mg L−1 d−1, respectively. The fatty acids in the diatom lipids were found to be (%, w/w of total lipids): palmitoleic acid (39.8%), palmitic acid (31.9%), myristic acid (6.8%), oleic acid (4.7%), stearic acid (4.5%), arachidonic acid (3.9%), eicosapentaenoic acid (3.6%), linoleic acid (2.5%), tetracosanoic acid (1.7%), and linolenic acid (0.6%).

Item Type: Article
Additional Information: Indexed by Scopus
Uncontrolled Keywords: Amphora copulata; Diatom; Lipids; Palm oil mill effluent; Algal oil
Subjects: T Technology > TP Chemical technology
Faculty/Division: Faculty of Industrial Sciences And Technology
Centre of Excellence: Earth Resources & Sustainability Centre (ERAS)
College of Engineering
Depositing User: Mrs Norsaini Abdul Samat
Date Deposited: 25 Aug 2021 08:17
Last Modified: 25 Aug 2021 08:17
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