The activity and stability of laccase and their kinetic mechanisms in water soluble ionic liquids (ILs): 1-butyl-3-methyl imidazolium chloride [C(4)mim][Cl], 1-octyl-3-methyl imidazolium chloride [C(8)mim][Cl], and 1-decyl-3-methyl imidazolium chloride [C(10)mim][Cl] were investigated. The results show that an IL concentration up to 10% is satisfactory for initial laccase activity at pH 9.0. The laccase stability was well maintained in [C(4)mim][Cl] IL when compared to the control. The inactivation of laccase increases with the length of the alkyl chain in the IL: [C(10)mim][Cl] > [C(8)mim][Cl] > [C(4)mim][Cl]. The kinetic studies in the presence of ABTS as substrate allowed calculating the Michaelis-Menten parameters. Among the ILs, [C(4)mim][Cl] was the suitable choice attending to laccase activity and stability. Alkyl chains in the ions of ILs have a deactivating effect on laccase, which increases strongly with the length of the alkyl chain.
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