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Ethanethiol Degradation by Ralstonia eutropha
Mahsa Sedighi,Farzaneh Vahabzadeh,Seyed Morteza Zamir,Abbas Naderifar 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.4
In the present study, a pure culture of Ralstonia eutropha was used to degrade gaseous ethanethiol. Ethane thiol at various initial concentrations ranging from 115 to 320 mg/m3 was degraded almost completely within 120 ~168 h, while at higher concentrations up to 452 mg/m3,removal efficiency declined. It was likely that ethanethiol was used as the source of energy by R. eutropha, since no clear increase in the biomass concentration was observed. Kinetic data of ethanethiol bidegradation could be fitted using the Monod model. The kinetic parameters were qm =0.23 (mg ethanethiol/g biomass/h), and Ks = 1.379 (mg/L). The mineralization pathway of ethanethiol through sulphate,as the detected product, and the energy production were discussed in some detail.
Mohammad Maleki,Mahdi Motamedi,Mahsa Sedighi,Seyed Morteza Zamir,Farzaneh Vahabzadeh 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.1
In the present study, phenol-adapted cells ofRalstonia eutropha were used to degrade p-nitrophenol(PNP) in the presence of phenol. PNP at initial concentrationsranging from 5 to 15 mg/L was degraded almost completelyby free cells of R. eutropha. The use of loofa-immobilizedcells increased the complete removal of PNP up to 30 mg/L. Kinetic data for PNP biodegradation by immobilized cellsof R. eutropha best fitted the Haldane model. The kineticparameters were ks = 0.0006 (mg PNP/mg biomass.h), Ks =8.83 (mg/L) and Ki = 30.77 (mg/L). The degradation pathwaysof PNP through the metabolites, 4-nitro-catechol (4-NC)and hydroquinone (HQ), were investigated using HPLC.