title: Screening of variables influencing the clavulanic acid production by Streptomyces DAUFPE 3060 strain.
abstract: Clavulanic acid (CA) is a beta-lactam antibiotic, which has a potent beta-lactamase inhibiting activity. The influence of five variables, namely pH (6.0, 6.4, and 6.8), temperature (28 degrees C, 30 degrees C, and 32 degrees C), agitation intensity (150, 200, and 250 rpm), glycerol concentration (5.0, 7.5, and 10 g/L) and soybean flour concentration (5.0, 12.5, and 20 g/L), on CA production by a new isolate of Streptomyces (DAUFPE 3060) was investigated in 250-mL Erlenmeyer flasks using a fractional factorial design. Temperature and soybean flour concentration were shown to be the two variables that exerted the most important effects on the production of CA at 95% confidence level. The highest CA concentration (494 mg/L) was obtained after 48 h at 150 rpm, 32 degrees C, pH 6.0, 5.0 g/L glycerol, and 20 g/L soybean flour concentrations. Under these conditions, the yields of biomass and product on consumed substrate were 0.26 g(X)/g(S) and 64.3 mg(P)/g(S), respectively. Fermentations performed in 3.0-L bench-scale fermenter allowed increasing the CA production by about 60%.
authors.affiliation: Department of Biochemical and Pharmaceutical Technology, University of São Paulo, Av. Prof. Lineu Prestes, 580, Bloco 16, Cidade Universitária, 05508-000, São Paulo, São Paulo, Brazil.
authors.forename: D A
authors.initials: DA
authors.lastname: Viana
authors.forename: M N
authors.initials: MN
authors.lastname: Carneiro-Cunha
authors.forename: J M
authors.initials: JM
authors.lastname: Araújo
authors.forename: B
authors.initials: B
authors.lastname: Barros-Neto
authors.forename: J L
authors.initials: JL
authors.lastname: Lima-Filho
authors.forename: A
authors.initials: A
authors.lastname: Converti
authors.forename: A
authors.initials: A
authors.lastname: Pessoa-Júnior
authors.forename: A L F
authors.initials: AL
authors.lastname: Porto
mesh_terms: D018533:Biomass; D019149:Bioreactors / Q000382:microbiology; D002244:Carbon / Q000494:pharmacology; D019818:Clavulanic Acid / Q000096:biosynthesis*; D005285:Fermentation / Q000187:drug effects; D005433:Flour; D005990:Glycerol / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D009584:Nitrogen / Q000494:pharmacology; D013302:Streptomyces / Q000187:drug effects / Q000378:metabolism*; D013997:Time Factors
chemical_list: D019818:Clavulanic Acid; D002244:Carbon; D009584:Nitrogen; D005990:Glycerol