Enantioseparation of amino acid derivatives on an immobilized network polymer derived from L-tartaric acid.
Seven structurally related amino acid derivatives were successfully enantioseparated by HPLC with a commercially available column containing a chiral immobilized network polymer derived from L-tartaric acid. The experiments were carried out under normal-phase conditions. All the solutes could be baseline separated using n-hexane/2-propanol (95/5) as eluent at a flow rate of 1 ml/min at 25 degrees C, with reasonable retention time (<12 min). The effects of the polar alcohol modifier (type and content) in the mobile phase and the column temperature on the enantioseparation were studied. Apparent thermodynamic parameters were also calculated from the plots of ln alpha or ln k' versus 1/T. Some mechanistic aspects of chiral recognition were discussed with respect to the structures of the solutes. It was found that the enantioseparations are all enthalpy driven, and the N-acyl groups of the solutes have significant influence on the chiral recognition.
Weng
Wen
W
Department of Chemistry, Zhangzhou Teachers College, Zhangzhou 363000, China. wwxiaoyaoyou@tom.com
Wang
Qing Hua
QH
Yao
Bi Xia
BX
Zeng
Qing Le
QL
D000438:Alcohols / Q000737:chemistry; D000465:Algorithms; D000596:Amino Acids / Q000032:analysis*; D011108:Polymers; D012822:Silicon Dioxide; D012997:Solvents; D013237:Stereoisomerism; D013644:Tartrates / Q000737:chemistry*; D013696:Temperature; D013816:Thermodynamics; D014753:Vinyl Compounds / Q000737:chemistry
D000438:Alcohols; D000596:Amino Acids; D011108:Polymers; D012997:Solvents; D013644:Tartrates; D014753:Vinyl Compounds; D012822:Silicon Dioxide; C029768:tartaric acid