TECHNOLOGY FOCUS - BIOLOGY - Preferred Process: The enzymes are extracellular and recoverable from the supernatant. The microorganism culture, supernatant or their parts are re-circulated in the process. The process water released from the process comprises at least 5%, preferably at least 10% less proteins than the process water of a single cell oil process without enzyme recovery. The aqueous phase of the microorganism culture or the supernatant is concentrated. The enzymes are intracellular and obtainable from the microorganism cells. The enzyme production is initiated and/or maintained by adding an enzyme inducer into the microorganism culture or the enzyme production occurs constitutively. The microorganism is cultivated on a medium comprising polymeric biomass, e.g. lignocellulose or its fractions as carbon source. The protein fraction in the aqueous phase of the microorganism culture or in the supernatant is enriched and optionally purified, stabilized, dried and/or formulated. Preferred Components: The enzymes comprise hydrolases, oxidoreductases, lyases, isomerases, transferases and/or ligases. The enzyme hydrolyses glycosidic bonds. The microorganism is a fungus or a yeast, where the fungus is a genus comprising Aspergillus (preferred), Trichoderma, Rhizopus or Humicola, or the yeast comprising Cryptococcus. EXAMPLE - Aspergillus oryzae was grown in flask cultures with purified birch xylan and spruce and birch hemicelluloses extracted with pressurized hot water extraction as carbon source. Cultivations were done in erlenmeyer flasks (250 ml) containing culture medium (50 ml). The growth medium base contained per liter of water is ammonium sulfate (1 g), magnesium sulfate (1 g), dipotassium phosphate (0.5 g), potassium dihydrogen phosphate (1 g) and calcium chloride dihydrate (0.2 g) and was supplemented with carbon source, yeast extract and optionally support material. Cultivation media were inoculated with 1 vol.% fungal spore suspension and the cultures were incubated at 28 degrees C. For purified xylan the medium base was supplemented with per liter is purified birch xylan (40 g) and yeast extract (1 g). Duplicate cultivations were incubated in orbital shaker (160 rpm) for 6 days. For spruce and birch hemicellulose the medium base was supplemented with per liter is dried spruce or birch hemicellulose (44 g) produced by hot water extraction, yeast extract (0.5 g) and cellulose (2 g) to give mechanical support for the fungal mycelium. Triplicate cultivations were incubated in orbital shaker (180 rpm) for 7 days. After incubation the culture broth was filtered through whatman 3 filter paper. Protein concentration and enzyme activities were determined from the filtrate. The re-tentate was washed with distilled water and dried. Biomass concentration and lipid content were determined from the dried samples. On purified birch xylan after 6 d cultivation Aspergillus oryzae fungus produced biomass (16 g/l) and the biomass contained lipids (10.5%). The protein concentration of the culture broths were for the spruce (0.06 mg/ml), birch hemicellulose cultivations (0.02 mg/ml), and for the birch xylan cultivation (0.05 mg/ml).