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KMID : 1094720110160051019
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Biotechnology and Bioprocess Engineering
2011 Volume.16 No. 5 p.1019 ~ p.1019
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Immobilization of recombinant nanobiofiber CS3 fimbriae onto alginate beads for improvement of cadmium biosorption
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Ghorbani Sepideh
Tabandeh Fatemeh
Yakhchali Bagher
Mehrnia Mohammad Reza
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Abstract
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A cell surface display system with metalbinding properties was previously developed using CS3 fimbriae, which are hollow tubes 20 nm-thick and 2 nm in diameter. In this study, hybrid CS3 pili were separated from recombinant Escherichia coli and entrapped in calcium alginate gel beads in order to improve their stabilization and also adsorption of heavy metals. The surface morphology of the gel beads containing pili was investigated by scanning electron microscopy (SEM). Immunofluorescence microscopy was employed to confirm the attachment of nanobiofibers to the alginate beads. The effects of three variables (sodium alginate concentration, protein to alginate mass ratio, and bead size) at two levels each on Cd2+ biosorption efficiency were investigated by full factorial experimental design. A second-order polynomial equation modeled the design space for the process response of cadmium removal capacity. The optimal values of the factors were obtained as follows: 1% sodium alginate concentration, 0.25 protein to alginate mass ratio, and a 6 mm bead size. Under these conditions, Cd2+ was adsorbed at 45.45 mg/g to the nanobiofiber. The results indicate that the immobilized recombinant hybrid CS3 pili may be an appropriate biosorbent for removal of heavy metals from polluted aquatic environments.
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KEYWORD
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recombinant CS3 pili, cadmium biosorption, full factorial design, immobilization, metal binding peptide, surface display
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