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48,80 €ISBN 978-3-8440-7598-4Softcover184 pages64 figures273 g21 x 14,8 cmEnglishThesis
September 2020
Magdalena Pätzold
Evaluation of Deep Eutectic Solvents as Alternative Reaction Media in Biocatalysis
Die Enzymkatalyse wird häufig mit wässrigen Reaktionsmedien assoziiert, aber Wasser ist ein eher unzureichendes Lösungsmittel für hydrophobe Substrate. In dieser Arbeit wurden tief eutektische Lösungsmittel (DES) als neuartige Reaktionsmedien für die Biokatalyse evaluiert. Für die Lipase katalysierte (–)-Menthyllaurat Synthese wurde beispielsweise ein DES, das aus beiden Substraten besteht, d.h. ein DES aus (–)-Menthol:Laurinsäure, als Solvens und Substrat verwendet, so dass kein Zusatzlösungsmittel nötig war. Die Reaktionsoptimierung führte zu einer Produktivität von 443 g L-1 d-1 bei 95 % Umsatz (24 h). Überschüssiges (–)-Menthol wurde destillativ abgetrennt und in einer zweiten DES Enzymreaktion wiederverwendet.
Enzyme catalysis is often associated with aqueous reaction media, but water is rather an inadequate solvent for hydrophobic substrates. In this study ‘deep eutectic solvents’ (DESs) were evaluated as novel reaction media for biocataylsis. For instance, a DES composed of both substrates, i.e. a DES made of (–)-menthol:lauric acid, was used as combined solvent and substrate for the lipase catalysed synthesis of (–)-menthyl laurate, so that no additional solvent was necessary. The optimisation of the reaction resulted in a batch productivity of 443 g L-1 d-1 at 95 % conversion (24 h). Excess (–)-menthol was separated in a vacuum distillation step and was reused for second enzymatic DES reaction.
Enzyme catalysis is often associated with aqueous reaction media, but water is rather an inadequate solvent for hydrophobic substrates. In this study ‘deep eutectic solvents’ (DESs) were evaluated as novel reaction media for biocataylsis. For instance, a DES composed of both substrates, i.e. a DES made of (–)-menthol:lauric acid, was used as combined solvent and substrate for the lipase catalysed synthesis of (–)-menthyl laurate, so that no additional solvent was necessary. The optimisation of the reaction resulted in a batch productivity of 443 g L-1 d-1 at 95 % conversion (24 h). Excess (–)-menthol was separated in a vacuum distillation step and was reused for second enzymatic DES reaction.
Keywords: DES; deep eutectic solvents; biocatalysis
Schriftenreihe des DECHEMA-Forschungsinstituts
Edited by DECHEMA-Forschungsinstitut, Frankfurt am Main
Volume 21
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