title: Relationship between coffee husk caffeine degradation and respiration of Aspergillus sp. LPBx in solid-state fermentation.
abstract: Studies were carried out in a packed-bed column fermentor using coffee husk as substrate in order to verify a relationship between caffeine degradation and the respiration of Aspergillus sp. LPBx. Fermentation conditions were optimized by using factorial design experiments. The kinetic study showed that the caffeine degradation was related to the development of mold and its respiration and also with the consumption of reducing sugars present in coffee husk. From the values obtained experimentally for oxygen uptake rate and CO2 evolved, we determined a biomass yield of 3.811 g of biomass/g of consumed O2 and a maintenance coefficient of 0.0031 g of consumed O2/(g of biomass x h). The maximum caffeine degradation achieved was 90%.
authors.affiliation: Departamento Engenharia Quimica, Universidade Federal do Paraná, Curitiba, Brazil.
authors.forename: Débora
authors.initials: D
authors.lastname: Brand
authors.forename: Ashok
authors.initials: A
authors.lastname: Pandey
authors.forename: Jose A
authors.initials: JA
authors.lastname: Rodriguez-Leon
authors.forename: Sevastianos
authors.initials: S
authors.lastname: Roussos
authors.forename: Ivo
authors.initials: I
authors.lastname: Brand
authors.forename: Carlos R
authors.initials: CR
authors.lastname: Soccol
mesh_terms: D001230:Aspergillus / Q000254:growth & development / Q000378:metabolism*; D001673:Biodegradation, Environmental; D018533:Biomass; D001709:Biotechnology / Q000379:methods; D002110:Caffeine / Q000737:chemistry / Q000378:metabolism*; D002245:Carbon Dioxide / Q000378:metabolism; D019069:Cell Respiration; D003069:Coffee / Q000737:chemistry* / Q000378:metabolism; D003470:Culture Media; D005285:Fermentation; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010100:Oxygen / Q000378:metabolism*; D010101:Oxygen Consumption; D012107:Research Design; D014867:Water / Q000032:analysis
chemical_list: D003069:Coffee; D003470:Culture Media; D014867:Water; D002245:Carbon Dioxide; D002110:Caffeine; D010100:Oxygen