English Abstract
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High-performance liquid chromatography (HPLC) and capillary electrophoresis (CE) are two well-known techniques in chemical analysis. Both have many separating modes and are used to assay Chinese herbal drugs. In the present study, two analyzing methods are established for assaying the constituents of the Chinese herbal preparation, Yi-chi-tsung-ming-tang. The suitability of the two methods was also evaluated and compared.
Yi-chi-tsung-ming-tang comprises Paeoniae Radix, Astragali Radix, Ginseng Radix, Puerariae Radix, Viticis Fructus, Cimicifugae Rhizoma, Glycyrrhizae Radix and Phellodendri Cortex. In HPLC analysis, eighteen constituents of Yi-chi-tsung-ming-tang, including gallic acid, benzoic acid, oxypaeoniflorin, albiflorin, paeoniflorin, paeonol, formononrtin, ferulic acid, caffeic acid, puerarin, daidzein, berberine, palmatine, jatrorrhizin, glycyrrhizin, 18b-glycyrrhetinic acid and ginsenoside Rb1, were separated in 80 minutes by a Cosmosil 5C18-MS column with a linear gradient elution system containing phosphates and acetonitrile which was detected at 203 nm, 210 nm, and 254 nm. Moreover, the constituents in each component herb and the home-made preparation were investigated herein. The preservation stability of the commercially available Yi-chi-tsung-ming-tang preparations was also evaluated by the developed analysis method.
In CE analysis, the analysis of Yi-chi-tsung-ming-tang was cut into two parts, MEKC and CZE, according to the properties of the constituents In MEKC, two constituents, albiflorin and paeoniflorin, could be separated in 15 minutes, using a buffer system containing anionic surfactants (40 mM SC) and acetonitrile as organic modifier. In CZE, thirteen constituents could be separated in 55 minutes, using a buffer system containing 20 mM borate(pH=9.76). The effects of the analysis parameters were also investigated herein. Moreover, one Chinese herb, Artemisiae Capillaris Herba, was analyzed by an on-line sample stacking CE method, sweeping. Also, the suitability and effects of the method were compared with those of the conventional CE methods.
From the results of the analysis, it is concluded that HPLC and CE possesses their own beneficial effects in terms of the suitability of the system, analyzing time, stability of the base line, and the number of theoretical plates of each compound, respectively. HPLC and CE can complement each other in the analysis of Chinese herbal preparations.
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