title: Optimisation of synthesis of oligosaccharides derived from lactulose (fructosyl-galacto-oligosaccharides) with β-galactosidases of different origin.
abstract: Batch synthesis of fructosyl-galacto-oligosaccharides from lactulose was performed with commercial β-galactosidase preparations from Aspergillus oryzae, Kluyveromyces lactis and Bacillus circulans. The enzyme from A. oryzae produced the highest yield and specific productivity of synthesis, being selected for further studies. Optimization of fructosyl-galacto-oligosaccharides synthesis was carried out using response surface methodology, considering temperature and initial sugar concentration as variables and yield and specific productivity as response parameters. Maximum yield of 0.41 g g(-1) fructosyl-galacto-oligosaccharides was obtained at 70°C and 60% w/w lactulose concentration, while maximum specific productivity of 1.2 g h(-1)mg(-1) was obtained at 70°C and 40% w/w lactulose concentration.
authors.affiliation: School of Biochemical Engineering, Pontificia Universidad Católica de Valparaíso, Avenida Brasil 2147, Valparaíso, Chile.
authors.forename: Cecilia
authors.initials: C
authors.lastname: Guerrero
authors.forename: Carlos
authors.initials: C
authors.lastname: Vera
authors.forename: Andrés
authors.initials: A
authors.lastname: Illanes
mesh_terms: D001236:Aspergillus oryzae / Q000201:enzymology; D001407:Bacillus / Q000201:enzymology; D001426:Bacterial Proteins / Q000737:chemistry*; D055162:Biocatalysis; D005656:Fungal Proteins / Q000737:chemistry*; D007700:Kinetics; D007716:Kluyveromyces / Q000201:enzymology; D007792:Lactulose / Q000737:chemistry*; D009844:Oligosaccharides / Q000138:chemical synthesis*; D001616:beta-Galactosidase / Q000737:chemistry*
chemical_list: D001426:Bacterial Proteins; D005656:Fungal Proteins; D009844:Oligosaccharides; D007792:Lactulose; D001616:beta-Galactosidase