title: [Continuous biosynthesis of epoxypropane in a methanotrophic attached-films reactor].
abstract: Using a fluidized bed as immobilization system, mixed culture methanotrophic attached-films were developed on diatomite particles. The Methane Monooxygenase (MMO) activity was found to increase obviously as soon as the lag phase ended. Greater than 90% of the MMO activity in the bed was attached. Biofilm concentration of 3.3-3.7 mg dry weight cell/g DS was observed. Batch experiments were performed to explore the possibility of producing epoxypropane by a cooxidation process. The effect of methane on the oxidation of propene to epoxypropane and the effect of propene on the growth of methanotroph were also studied. In continuous experiments, optimum mixed gaseous substrates (methane: 35%; propene: 20%; oxygen: 45%) were continuously circulated through the fluidized bed reactor to remove product. Initial epoxypropane productivity was 110-150 mumol/d. The bioreactor operated continuously for 25 d without obvious loss of epoxypropane productivity.
authors.affiliation: State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 73000, China. lzcpcn@ns.lzb.ac.cn
authors.forename: Jia-Ying
authors.initials: JY
authors.lastname: Xin
authors.forename: Jun-Ru
authors.initials: JR
authors.lastname: Cui
authors.forename: Jian-Bo
authors.initials: JB
authors.lastname: Chen
authors.forename: Shu-Ben
authors.initials: SB
authors.lastname: Li
authors.forename: Chun-Gu
authors.initials: CG
authors.lastname: Xia
mesh_terms: D018829:Adhesins, Bacterial / Q000502:physiology; D018441:Biofilms / Q000254:growth & development*; D019149:Bioreactors / Q000382:microbiology; D018914:Cells, Immobilized / Q000187:drug effects / Q000201:enzymology / Q000382:microbiology; D004852:Epoxy Compounds / Q000378:metabolism*; D008697:Methane / Q000378:metabolism / Q000494:pharmacology; D008772:Methylococcaceae / Q000187:drug effects / Q000201:enzymology* / Q000254:growth & development; D020581:Methylosinus / Q000187:drug effects / Q000201:enzymology* / Q000254:growth & development; D010084:Oxidation-Reduction; D010105:Oxygenases / Q000378:metabolism*; D011407:Propane / Q000378:metabolism / Q000494:pharmacology
chemical_list: D018829:Adhesins, Bacterial; D004852:Epoxy Compounds; D010105:Oxygenases; C021555:methane monooxygenase; D008697:Methane; D011407:Propane; C009068:propylene oxide