一些药物分子的核磁共振应用研究

应用1D NMR 和脉冲梯度场2D NMR技术（gCOSY，gNOESY，gHSQC，gHMBC）深入研究了氯雷他定(Loratadine)、依托度酸(Etodolac)、福莫特罗(Formoterol)和扎莱普隆(Zaleplon)的结构，对它们的¹H和¹³C NMR 化学位移进行了全归属.     

Separation of etodolac enantiomers by capillary electrophoresis. Validation and application of the chiral method to the analysis of commercial formulations

Separation of etodolac enantiomers, which exhibit different biological activity and pharmacokinetic profiles, has been achieved using the randomly substituted (2-hydroxy)propyl-beta-cyclodextrin (HP-beta-CD) as chiral selector in capillary electrophoresis. The selection of this CD was made after screening of different CD derivatives of neutral and anionic nature. The effect on the enantioresolution of the buffer concentration and of the degree of substitution (DS) and concentration of the CD as well as of instrumental parameters, such as the capillary temperature and the separation voltage, were studied. The highest resolution of etodolac enantiomers was around 2.5 using 100 mM phosphate buffer (pH 7.0) with 20 mM HP-beta-CD (DS approximately 4.2) and UV detection at 225 (10) nm with a reference wavelength at 360 (50) nm. Validation of the chiral method in terms of selectivity, linearity, precision (instrumental repeatability, method repeatability, intermediate precision), and the limits of detection and quantitation allowed to evaluate its quality to the analysis of etodolac enantiomers in different pharmaceutical preparations containing racemic etodolac.