Enhanced laccase stability through mediator partitioning into hydrophobic ionic liquids

Lars Rehmann, Ekaterina Ivanova, H. Q. Nimal Gunaratne, K.R. Seddon, Gill Stephens

Research output: Contribution to journalArticle

17 Citations (Scopus)
329 Downloads (Pure)

Abstract

Laccase-mediator systems have numerous potential uses for green oxidations, but their practical use may be limited because the reactive, oxidised mediators deactivate the enzyme. TEMPO, 4-hydroxybenzyl alcohol, phenothiazine and 2-hydroxybiphenyl caused almost complete deactivation of laccase from Trametes versicolor within 24-140 h. By contrast, 18% activity was retained after 188 h in controls without mediator, and 15% in the presence of ABTS. A biphasic reaction system was developed to protect the laccase, by partitioning the mediator into water-immiscible ionic liquids. In the presence of [C mim][AOT], laccase retained 54, 35, 35 and 41% activity after 188 h in the presence of 4-hydroxybenzyl alcohol, phenothiazine and 2-hydroxybiphenyl and ABTS, respectively, whilst 30% activity was retained in the presence of [N][Sac] and TEMPO. The protection against deactivation by the mediators correlated strongly with the distribution coefficients of the mediators between ionic liquids and water.
Original languageEnglish
Pages (from-to)1462-1469
Number of pages8
JournalGreen Chemistry
Volume16
Issue number3
Early online date05 Dec 2013
DOIs
Publication statusPublished - 01 Mar 2014

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