Chromatographic determination of impurities and their elimination using the high pressure liquid chromatography

Application of the high pressure liquid chromatography (HPLC) at the determination of impurities contents in liquid crystalline materials of all types beforehand the measurement of their physical characteristics. Chromatographic determination of the E-Z isomer ratio for the photosensitive liquid crystalline materials. Utilisation of preparative HPLC for reaching an extreme purity of liquid crystalline substances.