The famous prescription of So Cheong Ryong Tang (小靑龍湯)in Chinese herb medicine, which has been used for the treatment of common cold, influenza, asthmatic bronchitis, and bronchial asthma and, is being commercially produced in the form of decoction. However, the storage problem for this dosage form remains unsettled. The quantitative changes of the major constituents, at different temperature and time course, were examined employing HPLC and GC. Cinnamaldehyde, cinnamic acid, ephedrine, albiflorine, paeoniflorin, benzoic acid, glycyrrhizin, and liquiritin were choosen as phytochemical markers. The content of cinnamaidehyde significantly decreased when stored at increased temperature, while that of benzoic acid has increased. By overall consideration of the present experimental data, it was suggested that most constituents are considerably stable when preserved below freezing temperature.
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