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Contact |
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Fischer Fabian |
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Title |
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Biodiesel via in situ wet microalgae biotransformation: zwitter-type ionic liquid supported extraction and transesterification |
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Author(s) |
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Gerald Bauer, Serena Lima, Jean Chenevard, Marc Sugnaux, and Fabian Fischer |
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References |
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ACS Sustainable Chem. Eng. 2017, 5, 1931−1937 |
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Url |
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DOI: 10.1021/acssuschemeng.6b02665 |
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Abstract |
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The production of biodiesel derived from microalgae is among the most forthcoming technologies that provide an ecologic alternative to fossil fuels. Herein, a method was developed that enables the direct extraction and conversion of algal oil to biodiesel without prior isolation. The reaction occurs in aqueous media catalyzed by immobilized Candida antarctica lipase B (Novozyme 435). Zwitter-type ionic liquids were used as cocatalyst to improve the selectivity and reactivity of the enzyme. In a model reaction with sunflower oil, 64% biodiesel was obtained. Applying this method to a slurry of whole-cell Chlorella zof ingiensis in water resulted in 74.8% of lipid extraction, with 27.7% biotransformation products and up to 16% biodiesel. Factors that reduced the lipase activity with whole-cell algae were subsequently probed and discussed. This “in situ” method shows an improvement to existing methods, since it integrates the oil extraction and conversion into an one-pot procedure in aqueous conditions. The extraction is nondisruptive, and is a model for a greener algae to biodiesel process.
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