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Issue 3, 2010
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Cyto-toxicity and biocompatibility of a family of choline phosphate ionic liquids designed for pharmaceutical applications

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Abstract

Recently, the ionic liquid (IL) choline dihydrogen phosphate was demonstrated to improve the thermostability and shelf life of several model proteins, thus exhibiting potential as a stabilizing excipient or solvent for protein therapeutics. Before novel ILs can be used for biomedical applications, comprehensive data is required to establish biocompatibility, including cytotoxicity effects and solution behavior. In this study five phosphate-based anion moieties were analyzed: H2PO4 (DHP), dibutyl phosphate (DBP), bis(2-ethylhexyl) phosphate (BEH), bis(2,4,4-trimethylpentyl) phosphinate (TMP), and O,O′-diethyl dithiophosphate (DEP), all paired with the cation choline (C). Toxicity levels for these ILs, and a common sugar and salts, were established using a J774 murine macrophage cell line. The sugar trehalose, and the simple salts sodium chloride and choline chloride yielded EC50 values of >100, 63 and 34 mM, respectively. The EC50 values (mM) of CDHP (20), CDBP (9.1), and CDEP (8.2) were lower than, but within the range of simple salts NaCl (62.8) and choline Cl (33.7). The EC50 values of CTMP and CBEH were considerably lower, 0.25 and 0.30 mM, respectively. CDHP and CBEH displayed a hormetic response. Osmolality measurements indicated that CDHP, CDBP, and CDEP exhibit nearly complete dissociation in aqueous solution, with osmotic coefficients of 1.0, 0.9, and 0.8, whereas CTMP and CBEH have coefficients of 0.5 and 0.3, and are more molecular in character. A high correlation between the EC50 value and the anion mass fraction indicated that anion size and the presence of moderately long and/or branched alkyl chains may affect viability.

Graphical abstract: Cyto-toxicity and biocompatibility of a family of choline phosphate ionic liquids designed for pharmaceutical applications

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Supplementary files

Article information


Submitted
10 Sep 2009
Accepted
21 Dec 2009
First published
29 Jan 2010

Green Chem., 2010,12, 507-513
Article type
Paper

Cyto-toxicity and biocompatibility of a family of choline phosphate ionic liquids designed for pharmaceutical applications

K. D. Weaver, H. J. Kim, J. Sun, D. R. MacFarlane and G. D. Elliott, Green Chem., 2010, 12, 507 DOI: 10.1039/B918726J

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