Resolution of β‐amino acids on a high performance liquid chromatographic doubly tethered chiral stationary phase containing N–CH 3 amide linkage based on (+)‐(18‐crown‐6)‐2,3,11,12‐tetracarboxylic acid

• Published in: Journal of separation science 2007-10, Vol.30 (15), p.2539-2543
• Main Authors: Hyun, Myung Ho, Song, Yanci, Cho, Yoon Jae, Choi, Hee Jung
• Format: Article
• Language: English
• ISSN: 1615-9306; 1615-9314
• DOI: 10.1002/jssc.200700101

A doubly tethered chiral stationary phase (CSP) containing N–CH 3 amide linkage based on (+)‐(18‐crown‐6)‐2,3,11,12‐tetracarboxylic acid was applied to the resolution of various β‐amino acids. The chiral recognition behaviors for the resolution of β‐amino acids on the doubly tethered CSP were consistent with those on the corresponding singly tethered CSP while the chiral recognition ability of the doubly tethered CSP was generally greater in terms of both the separation (α) and the resolution factors ( R S ) than that of the corresponding singly tethered CSP. From these results, it was concluded that attaching the second tethering group to silica gel through a carbon atom of the first tethering group of the CSP improves the chiral recognition ability for the resolution of β‐amino acids without any change in the chiral recognition mode. The retention factors ( k 1 ) on the doubly tethered CSP were larger than those on the corresponding singly tethered CSP and these retention factors were found to be controllable with the variation of the type and the content of the organic and/or acidic modifier in the aqueous mobile phase without significant change in the separation and the resolution factors.