title: [Optimization of culture condition of a moderately thermophilic acidophilic Ferroplasma thermophilum].
abstract: The extreme microorganisms Ferroplasma spp., play an important role in bioleaching of sulphide ores at low pH value and temperatures around 50 degrees C. Without cell wall, Ferroplasma spp. is sensitive to pulp density, shearing force and heavy metal ions. Thus it is difficult to obtain their high cell density cultures, which limits the large-scale industrial application. In this paper, the optimum culture conditions of Ferroplasma thermophilum were studied by shaking culture. The results showed that the optimum culture conditions are as follows: 50 degrees C, initial pH 0.5, 50 mL working volume in 250 mL shaking-flask, inorganic nitrogen source (NH4)2SO4. The optimum combination of FeSO4.7H2O, yeast extract and peptone was determined by orthogonal experiments, including FeSO4.7H2O 40 g/L, yeast extract 0.3 g/L, peptone 0.2 g/L. Under the optimum culture conditions, the cell density was up to 6.3 x 10(7) cell/mL, and the oxidation of 40 g/L ferrous sulfate heptahydrate was finished in less than 72 hours. The results might provide information for scale-up of archaeon culture as well as its industrial application.
authors.affiliation: Key Laboratory of Biometallurgy, Ministry of Education, Changsha 410083, China. zhouhb@mail.csu.edu.cn
authors.forename: Hongbo
authors.initials: H
authors.lastname: Zhou
authors.forename: Juanhua
authors.initials: J
authors.lastname: Peng
authors.forename: Ruiyong
authors.initials: R
authors.lastname: Zhang
authors.forename: Chen
authors.initials: C
authors.lastname: Chen
authors.forename: Rubing
authors.initials: R
authors.lastname: Zhang
authors.forename: Guohua
authors.initials: G
authors.lastname: Gu
authors.forename: Guanzhou
authors.initials: G
authors.lastname: Qiu
mesh_terms: D001105:Archaea / Q000166:cytology / Q000254:growth & development*; D018929:Cell Culture Techniques / Q000379:methods*; D003470:Culture Media; D006863:Hydrogen-Ion Concentration; D008669:Metallurgy; D013696:Temperature
chemical_list: D003470:Culture Media