Xylanases and laccases-rich filtrates were produced by submerged culture on agroindustrial residues.

These were resistant after being in contact with various ionic salts and denaturing solutions

Had a good stability into a wide range of pH values (from 3 to 9)

Showed low stabilities at temperatures higher than 50°C

Enzyme-pretreated pulp had lower kappa number than the chemical-treated

The high contents of residual lignin and chromophore compound on liquors from enzymatic pretreatment indicate the positive action of the enzymes