Equilibrium study on enantioselective distribution of amlodipine besilate enantiomers in a biphasic recognition chiral extraction system

  • Panliang Zhang
  • Genlin Sun
  • Yunren Qiu
  • Kewen Tang
  • Congshan Zhou
  • Changan Yang
Original Article


The objective of this paper is to present the enantioselective distribution of amlodipine besilate enantiomers (ADB) in a biphasic recognition chiral extraction (BRCE) system. In the BRCE system, hydrophobic tartrate was added in organic phase and hydrophilic β-cyclodextrins in aqueous phase. Tartrate and β-cyclodextrins preferentially recognize (−)-ADB and (+)-ADB, respectively. Impacts of the type and concentration of chiral selectors, the pH value of the aqueous phase solution as well as temperature on the separation efficiency were investigated. Sulfobutyl ether-β-cyclodextrin (SBE-β-CD) and d-isobutyl tartrate (d-IBTA) were found to be the most suitable chiral selectors. By substituting the monophasic recognition chiral extraction (MRCE, with chiral selector in only one phase) system with BRCE system, the distribution ratios of the ADB enantiomers are remarkably increased with a little increase of enantioselectivity. The optimized conditions that are 5 °C of temperature, 7.2 of pH value, 0.05 mol/L of SBE-β-CD as well as 0.1 mol/L of d-IBTA are identified. The experimental results demonstrated that BRCE with strong chiral separation ability possesses good prospect in separation of enantiomers.


Chiral separation Biphasic recognition Chiral extraction Chiral selector Amlodipine besilate 



Biphasic recognition chiral extraction


Monophasic recognition chiral extraction


Distribution ratio, org/aq concentration


Distribution ratios of enantiomers with no chiral selectors






Selector of d-tartaric acid derivative





This work was supported by the National Science Foundation of China (No. 21501057), the planned Science and Technology project of Hunan Province, China (No. 2013SK3166), and Aid program for Science, construct program of the key discipline in Hunan province, and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province.


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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  1. 1.School of Chemistry and Chemical EngineeringCentral South UniversityChangshaChina
  2. 2.Department of Chemistry and Chemical EngineeringHunan Institute of Science and TechnologyYueyangChina

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