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Received November 19, 2014
Accepted January 13, 2015
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Effect of an ionic liquid on vancomycin crystallization

Department of Chemical Engineering, Kongju National University, Cheonan 330-717, Korea
Korean Journal of Chemical Engineering, April 2015, 32(4), 576-582(7), 10.1007/s11814-015-0014-1
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Abstract

We first developed a vancomycin crystallization process using an ionic liquid (IL) and improved the crystallization efficiency by optimization of crystallization conditions (pH, conductivity, solution of distilled water and IL/acetone ratio, crystallization temperature, IL concentration). We also investigated the effect of major process parameters on crystallization, using an electron microscope, and identified morphology by XRD analysis. Using ILs (1-butyl-3- methylimidazolium tetrafluoroborate ([BMIm][BF4]), 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIm] [PF6])), vancomycin crystals were successfully formed under the optimal crystallization conditions: pH 4.5; conductivity, 10 mS/cm; solution of distilled water and IL/acetone ratio, 1 : 3.5 (v/v); crystallization temperature, 10 oC; IL concentration, 20% (v/v). When using an IL ([BMIm][BF4]), the time required for crystallization in the existing crystallization methods (~24 hr) was dramatically decreased (~9 hr) and high-quality vancomycin crystals were successfully formed.

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