title: Lipase production by solid-state fermentation: cultivation conditions and operation of tray and packed-bed bioreactors.
abstract: The production of lipase by Penicillium simplicissimum in solid-state fermentation was studied using babassu cake as the basal medium. Tray-type and packed-bed bioreactors were employed. In the former, the influence of temperature; content of the medium, and medium supplementation with olive oil, sugarcane molasses, corn steep liquor, and yeast hydrolysate was studied. For all combinations of supplements, a temperature of 30 degrees C, a moisture content of 70%, and a concentration of carbon source of 6.25% (m/m, dry basis) provided optimum conditions for lipase production. When used as single supplements olive oil and molasses also were able to provide high lipase activities (20 U/g). Using packed-bed bioreactors and molasses-supplemented medium, optimum conditions for enzyme production were air superficial velocities above 55 cm/min and temperatures below 28 degrees C. The lower temperature optimum found for these reactors is probably related to radial heat gradient formation inside the packed bed. Maximum lipase activities obtained in these bioreactors (26.4 U/g) were 30% higher than in tray-type reactors.
authors.affiliation: Department of Biochemistry, Institute of Chemistry, Federal University of Rio de Janeiro, Centro de Tecnologia (CT), Laboratory 549-2, Ilha do Fundão, CEP 21945-970, Rio de Janeiro/RJ, Brazil.
authors.forename: Melissa L E
authors.initials: ML
authors.lastname: Gutarra
authors.forename: Elisa D C
authors.initials: ED
authors.lastname: Cavalcanti
authors.forename: Leda R
authors.initials: LR
authors.lastname: Castilho
authors.forename: Denise M G
authors.initials: DM
authors.lastname: Freire
authors.forename: Geraldo L
authors.initials: GL
authors.lastname: Sant'Anna
mesh_terms: D019149:Bioreactors / Q000382:microbiology*; D018929:Cell Culture Techniques / Q000379:methods*; D008049:Lipase / Q000096:biosynthesis* / Q000737:chemistry / Q000302:isolation & purification*; D008965:Molasses / Q000382:microbiology*; D000069463:Olive Oil; D010407:Penicillium / Q000201:enzymology* / Q000254:growth & development*; D010938:Plant Oils / Q000737:chemistry*; D013696:Temperature
chemical_list: D000069463:Olive Oil; D010938:Plant Oils; D008049:Lipase