An efficient magnetically modified microbial cell biocomposite for carbazole biodegradationReport as inadecuate

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Nanoscale Research Letters

, 8:522

First Online: 11 December 2013Received: 02 September 2013Accepted: 04 December 2013


Magnetic modification of microbial cells enables to prepare smart biocomposites in bioremediation. In this study, we constructed an efficient biocomposite by assembling Fe3O4 nanoparticles onto the surface of Sphingomonas sp. XLDN2-5 cells. The average particle size of Fe3O4 nanoparticles was about 20 nm with 45.5 emu g saturation magnetization. The morphology of Sphingomonas sp. XLDN2-5 cells before and after Fe3O4 nanoparticle loading was verified by scanning electron microscopy and transmission electronic microscopy. Compared with free cells, the microbial cell-Fe3O4 biocomposite had the same biodegradation activity but exhibited remarkable reusability. The degradation activity of the microbial cell-Fe3O4 biocomposite increased gradually during recycling processes. Additionally, the microbial cell-Fe3O4 biocomposite could be easily separated and recycled by an external magnetic field due to the super-paramagnetic properties of Fe3O4 nanoparticle coating. These results indicated that magnetically modified microbial cells provide a promising technique for improving biocatalysts used in the biodegradation of hazardous compounds.

KeywordsCarbazole Immobilization Nanoparticles Biodegradation Reusability Electronic supplementary materialThe online version of this article doi:10.1186-1556-276X-8-522 contains supplementary material, which is available to authorized users.

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Author: Yufei Li - Xiaoyu Du - Chao Wu - Xueying Liu - Xia Wang - Ping Xu



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