Phospholipase substrates of the general formula …IMAGE… are described in which… A denotes an alkylene or alkenylene group having 1 to 16 C atoms,… R denotes H or an alkyl, alkenyl or acyl group having 1 to 20 C atoms or an optionally alkyl-substituted aryl or aralkyl group having 1 to 8 C atoms in the alkyl radical,… X denotes the radical of an aromatic hydroxyl or thiol compound and each Y independently of one another denotes -S- or -O-, Z-SO3(-) or …IMAGE… where R1 can be a hydrogen atom or the group (CH2)nNRSS, in which n denotes a number from 2 to 4 and R2 denotes H or CH3,… or inositol,… or serine …IMAGE… or glycerol, and their use.
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