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Title: Hormetic effect of ionic liquid 1-ethyl-3-methylimidazolium acetate on bacteria

The biological effect of ionic liquids (ILs) is one of the highly debated topics as they are being contemplated for various industrial applications. 1-ethyl-2-methylimidazolium acetate ([EMIM][Ac]) showed remarkable hormesis on anaerobic Clostridium sp. and aerobic Psueudomonas putida. Bacterial growth was stimulated at up to 2.5 g L -1 and inhibited at > 2.5 g L -1 of ([EMIM][Ac]). The growth of Clostridium sp. and P. putida were higher by 0.4 and 4-fold respectively, in the presense of 0.5 g L -1 of ([EMIM][Ac]). Assessment of the effect of [EMIM][Ac] under different growth conditions showed that the hormesis of [EMIM][Ac] was mediated via regulation of medium pH. Hormetic effect of [EMIM][Ac] was evident only in medium with poor buffering capacity and in the presence of a fermentable substrate as the carbon source. The hormetic effect of [EMIM][Ac] on bacterial growth is most likely associated with the buffering capacity of acetate anion. These observations have implications in ILs toxicity studies and ecological risk assessment.
 [1] ;  [2]
  1. Bhabha Atomic Research Center, Kalpakkam (India). Biofouling and Biofilm Processes Sect.
  2. Brookhaven National Laboratory (BNL), Upton, NY (United States). Environmental Sciences Dept.; POSTECH, Pohang (Korea, Rep. of). Div. of Advanced Nuclear Engineering
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0045-6535; R&D Project: 02155/02158; YN0100000
Grant/Contract Number:
DE-SC00112704; SC00112704
Accepted Manuscript
Journal Name:
Additional Journal Information:
Journal Volume: 128; Journal ID: ISSN 0045-6535
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States