1: With sodium hydroxide; dipotassium hydrogenphosphate; disodium hydrogenphosphate; potassium dihydrogenphosphate; culture of Escherichia coli MM294/pCKG55 strain and culture of Corynebacterium ammoniagenes ATCC21170 strain in water; xylene T=32°C; pH=7.2; 23 h; Enzymatic reaction; 2: With sulfuric acid; water in xylene pH=1.0; Product distribution / selectivity;