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Enhanced Pb2+ biosorption by recombinant Saccharomyces cerevisiae expressing human metallothionein

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Abstract

Recombinant Saccharomyces cerevisiae expressing human hepatic metallothionein (SC-mt) was constructed for biosorption of lead(II). The gene sequence of mt was modified for codon preference of S. cerevisiae (SC) and synthesized using a chemical method. The influences of different experimental parameters such as solution pH, initial concentration, contact time, and temperature on adsorption were investigated. SC and SC-mt showed the highest Pb(II) sorption capacity at initial pH of 5.0 and contact time of 30 min. Adsorption on SC-mt was more favorable than on SC; in addition, the saturated monolayer sorption capacity increased from 80.00 to 181.82 mg/g at 298 K. Adsorption kinetics was better described by a pseudo-second-order model, and the adsorption process could be well described by the Langmuir isotherm. Thermodynamic parameters of SC-mt, namely ΔG°(298 K), ΔH°, and ΔS°, were determined to be −17.91 and 12.13 kJ mol−1, and 100.81 J mol−1 K−1, respectively, demonstrating that the sorption process of SC-mt towards Pb(II) was feasible, spontaneous, and endothermic in nature. The results indicate that the recombinant S. cerevisiae SC-mt should be useful for enhancement of the effectiveness of lead biosorption in practice.

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Acknowledgments

We are grateful to the National Science Foundation of China (Grant No. 21107014 and 21201033), Youth Science Foundation of Education Department of Jiangxi Province (Grant No. GJJ11140), National Science Foundation of China (Grant No. 21267001), and Fundamental Science on Radioactive Geology and Exploration Technology Laboratory Foundation (Grant No. REGT1217) for financial support.

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Correspondence to Zhibin Zhang.

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J. Shang has equally contributed to this article.

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Li, M., Zhang, Z., Shang, J. et al. Enhanced Pb2+ biosorption by recombinant Saccharomyces cerevisiae expressing human metallothionein. Monatsh Chem 145, 235–240 (2014). https://doi.org/10.1007/s00706-013-1016-5

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  • DOI: https://doi.org/10.1007/s00706-013-1016-5

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