Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Effects of redox mediators on azo dye decolorization by Shewanella algae under saline conditions
Ist Teil von
Bioresource technology, 2014-01, Vol.151, p.63-68
Ort / Verlag
Kidlington: Elsevier Ltd
Erscheinungsjahr
2014
Link zum Volltext
Quelle
MEDLINE
Beschreibungen/Notizen
•First study on mediated bacterial azo dye decolorization under saline conditions.•Quinone respiration of marine Shewanella strains under saline conditions.•Detailed studies of different effects of various quinones on decolorization.•Study of rate-limiting step of mediated decolorization under saline conditions.
Azo dye decolorization by Shewanella algae (SAL) in the presence of high concentrations of NaCl and different quinones or humic acids was investigated to reveal the effects of redox mediator under saline conditions. Growth of SAL and the other two marine Shewanella strains coupled to anthraquinone-2,6-disulfonate (AQDS) reduction was observed in a wide range of NaCl concentrations (0–7%). AQDS showed the best enhancing effects, whereas some other quinones demonstrated poorer stimulating or even inhibiting effects on acid red 27 (AR27) decolorization. Different humic acids could also enhance the decolorization. The correlation between specific AQDS-mediated reduction rate and initial AR27 concentration could be described with Michaelis–Menten kinetics (Km=0.2mM and Vmax=9.3μmolmgcell−1h−1). AQDS reduction by SAL was determined to be the rate-limiting step of mediated reduction. Mediated decolorization products of AR27 were determined to be less phytotoxic aromatic amines.