Abstract
Limonene is a biorenewable cycloterpene solvent derived from orange peel waste. Its potential as a “green” solvent to replace heptane was recently evaluated. Countercurrent chromatography (CCC) is a preparative separation technique using biphasic liquid systems. One liquid phase is the mobile phase; the other liquid phase is the stationary phase held in place by centrifugal fields. A particular range of special proportions of the heptane/ethyl acetate/methanol/water system is called the Arizona (AZ) liquid system when the heptane/ethyl acetate ratio is exactly the same as the methanol/water ratio. A continuous polarity decrease is obtained between the most polar A composition (ethyl acetate/water or 0/1/0/1 v/v) and the least polar Z composition (heptane/methanol or 1/0/1/0 v/v), replacing heptane by limonene and methanol by ethanol produce biphasic liquid systems much more environmentallyfriendly than the original AZ compositions. The chemical compositions of the two liquid phases of 12 AZ limonene/ethyl acetate/ethanol/water proportions were fully determined by Karl-Fisher titration of water and by gas chromatography for the organic solvents. The results were compared with the compositions of the corresponding AZ mixtures containing heptane and methanol. Significant differences in ethyl acetate and ethanol distribution between phases of the two systems with identical volume proportions were established. The ratio of the upper phase over the lower phase volumes and the phase density difference are important in CCC, there are also significant differences between the classic and “green” AZ systems that are discussed.
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Acknowledgments
K.F. and A.B.. thank the French Centre National de la Recherche Scientifique (CNRS ISA UMR5280) for continuous support. E.B. and P.S. thank Rousselet Centrifugation (Annonay, France) for, a 3-year CIFRE PhD grant and a 1-year industrial grant respectively.
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Faure, K., Bouju, E., Suchet, P. et al. Limonene in Arizona liquid systems used in countercurrent chromatography. I Physicochemical properties. Anal Bioanal Chem 406, 5909–5917 (2014). https://doi.org/10.1007/s00216-014-8005-3
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DOI: https://doi.org/10.1007/s00216-014-8005-3