Bioaccumulation characterization of zinc and cadmium by Streptomyces zinciresistens, a novel actinomycete

• Published in: Ecotoxicology and environmental safety Vol. 77; pp. 7 - 17
• Main Authors: Lin, Yanbing, Wang, Xinye, Wang, Baoping, Mohamad, Osama, Wei, Gehong
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 01-03-2012; Elsevier
• Subjects: Adsorption; Animal, plant and microbial ecology; Applied ecology; Bioaccumulation; Biological and medical sciences; biomass; Cadmium; Cadmium - metabolism; Cations, Divalent - metabolism; cell walls; cytoplasmic granules; desorption; Ecotoxicology, biological effects of pollution; electrons; Environmental Pollutants - metabolism; Fundamental and applied biological sciences. Psychology; General aspects; Granular materials; Isotherms; Models, Chemical; mycelium; sorption isotherms; Streptomyces; Streptomyces - metabolism; Streptomyces zinciresistens; Surface chemistry; Walls; Zinc; Zinc - metabolism; Streptomyces zinciresistens; Cadmium; Bioaccumulation; Zinc; Streptomycetaceae; Ecotoxicology; Toxicity; Streptomyces; Heavy metal; Actinomycetales; Characterization; Pollutant; Bacteria; Environment; Actinomycetes; Biological accumulation
• ISSN: 0147-6513; 1090-2414
• DOI: 10.1016/j.ecoenv.2011.09.016

The bioaccumulation characteristics of Zn
2+ and Cd
2+ by a novel species,
Streptomyces zinciresistens CCNWNQ0016
T, were investigated.
S. zinciresistens accumulated Zn
2+ and Cd
2+ mainly on the cell wall followed by intracellular accumulation. The mycelium was deformed, aggregated and formed precipitate of zinc and cadmium on the cell surface. Electron dense granules were detected on the cell wall as well as within the cytoplasm. The amino, carboxyl, hydroxyl and carbonyl groups were responsible for the biosorption of Zn
2+ and Cd
2+. The Langmuir isotherm model fitted the experimental data of metals adsorption processes better than Freundlich isotherm model. Cu
2+ and Cr
3+ competed for adsorption sites on the cell surface with Zn
2+ and Cd
2+. 87.33% and 98.11% recovery of Zn
2+ and Cd
2+, respectively, could be obtained at pH≤2 from metal-loaded biomass of
S. zinciresistens desorption.
► A living novel species metals-resistant,
Streptomyces zinciresistens, was applied to bioaccumulation of zinc and cadmium. ► Langmuir isotherms model and pseudo-second-order kinetic model were applicable to describing the adsorption system. ► Cu
2+ and Cr
3+ had strong inhibitory effect on Zn
2+/Cd
2+ adsorption while the inhibitory effect of Ni
2+ is lowest. ►
S. zinciresistens accumulated Zn
2+/Cd
2+ mainly on the cell surface as well as within the cytoplasm by SEM-EDXS and TEM-EDXS. ► The functional groups of
S. zinciresistens responsible for the metals binding were O–H, N–H, C=O by FT-IR.