ch u2014 d u2014 ch u2550 n u2014 d u2014 n u2550 n u2014 d or u2014 n u2550 ch u2014 d in which d is selected from the group consisting of u2014 co u2014 e u2014 so 2 u2014 e u2014 n u2014 xy and u2014 n u2014 xyz in which e may be u2014 h u2014 oh u2014 r or u2014 or and x and y and z may be identical or different and selected from u2014 h and u2014 r r being a c 1 c 16 alkyl preferably a c 1 c 8 alkyl which alkyl may be saturated or unsaturated branched or unbranched and optionally substituted with a carboxy sulfo or amino group and b and c may be the same or different and selected from c m h 2m 1 1 u2266 m u2266 5 specific compounds covered by the above formula i are acetosyringone syringaldehyde methylsyringate syringic acid ethylsyringate propylsyringate butylsyringate hexylsyringate octylsyringate and ethyl 3 4 hydroxy 3 5 dimethoxyphenyl other suitable mediators are vanillic acid nha hobt ppo and violoric acid the enzyme treatment can be done at conventional consistency e g 0 5 25 particularly 0 5 10 dry substance at temperatures of 20 90 u00b0 c and at a ph of 4 10 furthermore the enzyme and mediator treatment may be carried out.