Described herein is a liquid enzyme preparation containing
component (a): at least one salt according to general formula (I) (R2)3N+—(CH2)nC(R3)(R4)—(O—X)m—O—C(O)—R1A−  (I) wherein n is selected from 1 to 12, m is selected from zero to 50, R1 is selected from the group consisting of methyl, ethyl, —CH(OH)—CH(OH)—COOH, CH(OH)—CH3, (E)-CH═CHCOOH, (Z)—CH═CHCOOH, —C6H5, para-HO—C6H4—, o,p-dihydroxyphenyl, and 3,4,5-triydroxyphenyl, R2 are same or different and selected from C1-C10-alkyl, phenyl, R3 and R4 are same or different and selected from hydrogen and C1-C4-alkyl, X is C2-C4-alkylen, and A− is an inorganic or organic counteranion, component (b): at least one enzyme selected from hydrolases (EC 3), and optionally component (c): at least one compound selected from enzyme stabilizers different from component (a), preservatives, and surfactants.