TY - JOUR T1 - Biphasic recognition chiral extraction: A novel method for separation of mandelic acid enantiomers. AU - Tang,Kewen, AU - Yi,Jianmin, AU - Huang,Kelong, AU - Zhang,Guoli, PY - 2008/6/24/pubmed PY - 2009/3/6/medline PY - 2008/6/24/entrez SP - 390 EP - 5 JF - Chirality JO - Chirality VL - 21 IS - 3 N2 - This article reports a new chiral separation method-biphasic recognition chiral extraction for the separation of mandelic acid enantiomers. Distribution behavior of mandelic acid enantiomers was studied in the extraction system with O,O'-di-benzoyl-(2S,3S)-4-toluoyl-tartaric acid (D-(+)-DTTA) in organic phase and beta-CD derivatives in aqueous phase, and the influence of the types and concentrations of extractants and pH on extraction efficiency was investigated. Hydroxypropyl-beta-cyclodextrin (HP-beta-CD), hydroxyethyl-beta-cyclodextrin (HE-beta-CD), and methyl-beta-cyclodextrin (Me-beta-CD) have stronger recognition abilities for S-mandelic acid than those for R-mandelic acid, among which HP-beta-CD has the strongest ability. D-(+)-DTTA preferentially recognizes R-mandelic acid. pH and the concentrations of extractants have great effects on chiral separation ability. A high enantioseparation efficiency with a maximum enantioselectivity of 1.527 is obtained at pH of 2.7 and the ratio of 2:1 of [D-(+)-DTTA] to [HP-beta-CD]. The obtained results indicate that the biphasic recognition chiral extraction is of stronger chiral separation ability than the monophasic recognition chiral extraction. It may be very helpful to optimize the extraction systems and realize the large-scale production of pure enantiomers. SN - 1520-636X UR - https://www.unboundmedicine.com/medline/citation/18570311/Biphasic_recognition_chiral_extraction:_A_novel_method_for_separation_of_mandelic_acid_enantiomers_ L2 - https://doi.org/10.1002/chir.20601 DB - PRIME DP - Unbound Medicine ER -