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Fractionation and lipase-catalyzed conversion of microalgal lipids to biodiesel

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Abstract

This study was conducted to evaluate the lipid fractionation and purification procedures of lipase-catalyzed conversion of neutral lipids to microalgal biodiesel. Microalgae lipids were efficiently recovered and purified by a combined extraction method and crude lipid extracts were separated into neutral lipids, glycolipids, and phospholipids by solid-phase extraction. The high purity of the neutral lipids fraction was confirmed by its low concentration of phosphorous (< 2.0 ppm). Transesterification was catalyzed by immobilized Candida antarctica lipase for 72 h with stepwise addition of methanol. The reaction displayed Michaelis–Menten kinetics and produced high yields of microalgal biodiesel (91.2% in the case of Dunaliella salina) with a high content of unsaturated fatty acids (81.5%). Neutral lipids were converted to biodiesel by three-step transesterification, while the removal of polar lipids maintained the activity of the immobilized lipase by reducing both reaction mixture viscosity and contamination risk.

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Authors and Affiliations

  1. Department of Biochemical and Polymer Engineering, Chosun University, Gwangju, 61452, Korea

    Se Won Kim, Mizhang Xiao & Hyun-Jae Shin

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  1. Se Won Kim
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  2. Mizhang Xiao
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  3. Hyun-Jae Shin
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Correspondence to Hyun-Jae Shin.

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Kim, S.W., Xiao, M. & Shin, HJ. Fractionation and lipase-catalyzed conversion of microalgal lipids to biodiesel. Biotechnol Bioproc E 21, 743–750 (2016). https://doi.org/10.1007/s12257-016-0176-7

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  • DOI: https://doi.org/10.1007/s12257-016-0176-7

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