title: Galacto-oligosaccharide production from lactose by Sirobasidium magnum CBS6803.
abstract: Galacto-oligosaccharide (Gal-OS) was produced from lactose by a yeast, Sirobasidium magnum CBS6803. With toluene-treated resting cells, 136 mg ml-1 of Gal-OS was produced from 360 mg ml-1 of lactose at 50 degrees C for 42 h. Then, the yield of Gal-OS was increased by a culture method in which cell growth followed the enzymatic reaction: 224 mg ml-1 of Gal-OS was produced at 30 degrees C for 60 h. Finally, combination of the toluene-treated resting cells and glucose oxidase plus catalase was applied to improve productivity by the removal of a by-product, glucose, which inhibits the Gal-OS production, from the reaction mixture. In this case, 242 mg ml-1 of Gal-OS was produced at 50 degrees C for 42 h without cell growth. The structure of the major product was identified as 4'-galactosyl-lactose.
authors.affiliation: Central Research Laboratories of Ajinomoto Co. Inc., Kawasaki-shi, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Onishi
authors.forename: I
authors.initials: I
authors.lastname: Kira
authors.forename: K
authors.initials: K
authors.lastname: Yokozeki
mesh_terms: D001487:Basidiomycota / Q000378:metabolism*; D002374:Catalase / Q000494:pharmacology; D005690:Galactose / Q000378:metabolism*; D005949:Glucose Oxidase / Q000494:pharmacology; D007785:Lactose / Q000378:metabolism*; D009844:Oligosaccharides / Q000378:metabolism*; D014050:Toluene / Q000494:pharmacology
chemical_list: D009844:Oligosaccharides; D014050:Toluene; D005949:Glucose Oxidase; D002374:Catalase; D007785:Lactose; D005690:Galactose