scholarly journals Progress in the Enantioseparation of β-Blockers by Chromatographic Methods

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 468
Author(s):  
Yiwen Yang ◽  
Yehui Wang ◽  
Zongbi Bao ◽  
Qiwei Yang ◽  
Zhiguo Zhang ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Supercritical Fluid ◽  
Supercritical Fluid Chromatography ◽  
High Performance ◽  
Simulated Moving Bed ◽  
Moving Bed ◽  
Chromatographic Methods ◽  
Simulated Moving Bed Chromatography ◽  
Β Blockers

β-adrenergic antagonists (β-blockers) with at least one chiral center are an exceedingly important class of drugs used mostly to treat cardiovascular diseases. At least 70 β-blockers have been investigated in history. However, only a few β-blockers, e.g., timolol, are clinically marketed as an optically pure enantiomer. Therefore, the separation of racemates of β-blockers is essential both in the laboratory and industry. Many approaches have been explored to obtain the single enantiomeric β-blocker, including high performance liquid chromatography, supercritical fluid chromatography and simulated moving bed chromatography. In this article, a review is presented on different chromatographic methods applied for the enantioseparation of β-blockers, covering high performance liquid chromatography (HPLC), supercritical fluid chromatography (SFC) and simulated moving bed chromatography (SMB).

scholarly journals Determination of Optical Purity of Lactic Acid-Based Chiral Liquid Crystals and Corresponding Building Blocks by Chiral High-Performance Liquid Chromatography and Supercritical Fluid Chromatography

Molecules ◽  
2019 ◽  
Vol 24 (6) ◽  
pp. 1099 ◽  
Author(s):  
Anna Poryvai ◽  
Terezia Vojtylová-Jurkovičová ◽  
Michal Šmahel ◽  
Natalie Kolderová ◽  
Petra Tomášková ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Supercritical Fluid ◽  
Supercritical Fluid Chromatography ◽  
High Performance ◽  
Liquid Crystalline ◽  
Optical Purity ◽  
Building Blocks ◽  
Crystalline Materials ◽  
Liquid Crystalline Materials

Liquid crystals (LCs) are among the most prominent materials of the current information age, mainly due to their well-known application in liquid crystal displays (LCDs). Their unique electro-optical properties stem from their ability to form organised structures (mesophases) on the transition from solid state to isotropic liquid. Molecules of LCs in a mesophase still maintain the anisotropy of solid crystals, while simultaneously exhibiting the fluidity of liquids, which gives the system the ability to react immediately to external stimuli such as electric or magnetic fields, light, mechanical stress, pressure and, of course, temperature. For the proper function of LC-based devices, not only chemical, but also optical purity of materials is strongly desirable, since any impurity could be detrimental to the self-assembly of the molecules. Therefore, in this study we aimed to verify synthetic methods published in the literature, which are used nowadays to prepare chiral building blocks based on lactic acid, for their enantioselectivity. Moreover, we have focused on the development of an analytical chiral separation method for target liquid crystalline materials. Using a chiral polysaccharide-based column operated in liquid chromatography mode, we show that not all published methods of LC synthesis are enantioselective, which could lead to significant differences in the properties of the resulting materials. We show that high-performance liquid chromatography with UV detection and supercritical fluid chromatography with UV and mass spectrometry detection enable full control over the chemical and optical purity of the target LCs and the corresponding chiral building blocks. For the first time, we utilise supercritical fluid chromatography with mass detection for the direct chiral analysis of liquid crystalline materials and impurities formed during the synthesis.

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