Inactivation of Escherichia coli planktonic cells by multi-walled carbon nanotubes in suspensions: Effect of surface functionalization coupled with medium nutrition level

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Title:	Inactivation of Escherichia coli planktonic cells by multi-walled carbon nanotubes in suspensions: Effect of surface functionalization coupled with medium nutrition level
Authors:	秦靜如;Chi, Mu-Fan;Wu, Wei-Ling;Du, Yuchin;Chin, Ching-Ju M.;Lin, Chu-Ching
Contributors:	工學院環境工程研究所
Keywords:	acid treatment;adsorption;Anti-Bacterial Agents - pharmacology;antibacterial properties;Bacteria;Carbon nanotubes;Cell Membrane - drug effects;cell membranes;Culture Media;cytotoxicity;direct contact;Dispersion;ecotoxicology;electrostatic interactions;Escherichia coli;Escherichia coli - drug effects;Escherichia coli - growth & development;Humic Substances;Medium nutrition level;Microbial cytotoxicity;Multi wall carbon nanotubes;MWCNT dispersivity;Nanotubes, Carbon;nutrients;Nutrition;organic matter;Phthalic Acids - pharmacology;Physical properties;plankton;Planktonic cells;Static Electricity;Surface chemistry;Surface functionalization;Suspensions;Toxicity;viability
Date:	2016-11-15
Issue Date:	2026-04-23 15:04:01 (UTC+8)
Publisher:	Elsevier;Netherlands: Elsevier B.V
Abstract:	摘要： •MWCNTs were functionalized by acid treatment and adsorption of organic matter.•Bacterial toxicity of MWCNTs in suspensions was assayed with E. coli planktonic cultures.•MWCNT surface modifications significantly exerted impacts on the dispersivity of MWCNTs.•Inactivation of planktonic cells was both MWCNT functionalization- and medium nutrition-dependent.•Dispersity alone may not be a proper index to estimate CNT bacterial toxicity on suspended cells. While earlier studies have identified the antibacterial activity of carbon nanotubes (CNTs) and proposed that cell membrane damage by direct contact with CNTs is likely the main toxicity mechanism, the relative importance of chemical versus physical properties of CNTs in controlling their bacterial cytotoxicity is understudied. Given that CNT is commonly modified via acid treatment to enhance its dispersivity and surface chemistry, in this study commercially available multi-walled carbon nanotubes (MWCNTs) with high purity were processed carefully by acid reflux, resulting in differences in surface charge of MWCNTs without altering their physical properties. The surface condition of MWCNTs was also modified by adsorption of organic matter to compare bacterial toxicity of functionalized and non-functionalized MWCNTs in suspensions. Results show that although overall electrostatic repulsion and steric obstruction resulted from surface modifications led to elevated dispersivity of MWCNTs and mitigated toxicity on planktonic Escherichia coli cultures, no correlation between the dispersivity and bacterial toxicity of MWCNTs was observed, suggesting that dispersity alone may not be a proper index to estimate the CNT antibacterial effect on planktonic cells in the aqueous phase. In addition, viability recovery of MWCNT-treated cells was observed to be nutrition level-dependent, implying that availability of proper nutrients may be another important factor to be considered when assessing the ecotoxicity of CNTs in the aquatic system. 其他題名： J Hazard Mater 出版者： Netherlands: Elsevier B.V 出版日期： 2016-11-15 出處： Journal of hazardous materials, 2016-11, Vol.318, p.507-514 版權： 2016 Elsevier B.V. 版權： Copyright © 2016 Elsevier B.V. All rights reserved. 識別號： ISSN: 0304-3894 識別號： ISSN: 1873-3336 識別號： EISSN: 1873-3336 識別號： DOI: 10.1016/j.jhazmat.2016.07.013 識別號： PMID: 27450343
Appears in Collections:	[Graduate Institute of Environmental Engineering ] journal & Dissertation

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