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Title: Molecular mechanisms of ionic liquid cytotoxicity probed by an integrated experimental and computational approach

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep19889· OSTI ID:1242373
 [1];  [1];  [1];  [1];  [2];  [3];  [1]
  1. Univ. of Notre Dame, Notre Dame, IN (United States)
  2. Wayne State Univ., Detroit, MI (United States)
  3. Oklahoma State Univ., Stillwater, OK (United States)

Ionic liquids (ILs) are salts that remain liquid down to low temperatures, and sometimes well below room temperature. ILs have been called “green solvents” because of their extraordinarily low vapor pressure and excellent solvation power, but ecotoxicology studies have shown that some ILs exhibit greater toxicity than traditional solvents. A fundamental understanding of the molecular mechanisms responsible for IL toxicity remains elusive. Here we show that one mode of IL toxicity on unicellular organisms is driven by swelling of the cell membrane. Cytotoxicity assays, confocal laser scanning microscopy, and molecular simulations reveal that IL cations nucleate morphological defects in the microbial cell membrane at concentrations near the half maximal effective concentration (EC50) of several microorganisms. Lastly, cytotoxicity increases with increasing alkyl chain length of the cation due to the ability of the longer alkyl chain to more easily embed in, and ultimately disrupt, the cell membrane.

Research Organization:
University of Notre Dame, IN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
FG36-08GO88020
OSTI ID:
1242373
Journal Information:
Scientific Reports, Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 79 works
Citation information provided by
Web of Science

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Cited By (21)

Surfactant selection for a liquid foam-bed photobioreactor journal February 2018
Environmental Impact of Ionic Liquids: Recent Advances in (Eco)toxicology and (Bio)degradability journal May 2017
Can cells maintain their bioactivity in ionic liquids? A novel single‐cell assessment by Raman microspectroscopy journal February 2019
Room-temperature ionic liquids meet bio-membranes: the state-of-the-art journal August 2017
Ionic liquids in whole-cell biocatalysis: a compromise between toxicity and efficiency journal January 2018
Deciphering interactions of ionic liquids with biomembrane journal March 2018
Controlling the mechanoelasticity of model biomembranes with room-temperature ionic liquids journal May 2018
Exceptional solvent tolerance in Yarrowia lipolytica is enhanced by sterols journal July 2019
Hormesis of some organic solvents on Vibrio qinghaiensis sp.-Q67 from first binding to the β subunit of luciferase journal January 2017
The partition and transport behavior of cytotoxic ionic liquids (ILs) through the DPPC bilayer: Insights from molecular dynamics simulation journal July 2016
Scaling-Up Ionic Liquid-Based Technologies: How Much Do We Care About Their Toxicity? Prima Facie Information on 1-Ethyl-3-Methylimidazolium Acetate journal November 2017
Correlating Lipid Membrane Permeabilities of Imidazolium Ionic Liquids with their Cytotoxicities on Yeast, Bacterial, and Mammalian Cells journal June 2019
Effect of Organic Solvents on Microalgae Growth, Metabolism and Industrial Bioproduct Extraction: A Review journal July 2017
The Use of Liquids Ionic Fluids as Pharmaceutically Active Substances Helpful in Combating Nosocomial Infections Induced by Klebsiella Pneumoniae New Delhi Strain, Acinetobacter Baumannii and Enterococcus Species journal September 2018
Ionic Liquids as Potential and Synergistic Permeation Enhancers for Transdermal Drug Delivery journal February 2019
Choline-Based Ionic Liquids as Media for the Growth of Saccharomyces cerevisiae journal July 2019
1-Benzyl-3-cetyl-2-methylimidazolium Iodide (NH125) Is a Broad-Spectrum Inhibitor of Virus Entry with Lysosomotropic Features journal June 2018
The partition and transport behavior of cytotoxic ionic liquids (ILs) through the DPPC bilayer: Insights from molecular dynamics simulation text January 2017
1-Benzyl-3-cetyl-2-methylimidazolium Iodide (NH125) Is a Broad-Spectrum Inhibitor of Virus Entry with Lysosomotropic Features. text January 2018
Room-Temperature Ionic Liquids Meet Bio-Membranes: the State-of-the- Art text January 2017
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