[Determination of sennoside A and sennoside B in formulation using capillary electrophoresis]

[Analysis of natural medicines by micellar electrokinetic chromatography (MEKC) (II)--determination of atractylenolide III in Atractylodis Rhizoma]

We have investigated a method to analyze the marker substance of natural medicines by employing capillary electrophoretic techniques such as micellar electrokinetic chromatography (MEKC). We previously reported a simple MEKC assay method for calycosin in Astragali Radix and its fluid extract. In this investigation, we analyzed the marker substance atractylenolide III in Atractylodis Rhizoma. Atractylenolide III was clearly separated from the other components in A. Rhizoma and its dried extract by simple solvent extraction with hexane and subsequent MEKC analysis with sodium dodecyl sulfate (SDS) within 10 min. Validation of the analytical procedures of the assay method was performed according to the Japanese Pharmacopoeia and International Conference on Harmonization guidelines. As a result, we confirmed that capillary electrophoresis, including MEKC, is a powerful method for estimating the quality of natural medicines and traditional Chinese medicines consisting of various components.

Determination of aloenin, barbaloin and isobarbaloin in aloe species by micellar electrokinetic chromatography

Aloenin, barbaloin and isobarbaloin in JP Aloe, Aloe barbadensis (Aloe vera) and Aloe arborescens Miller var. natalensis Berger (Aloe arborescens Miller) were determined by micellar electrokinetic chromatography (MEKC) with 50 mM sodium dodecyl sulfate. Aloenin, barbaloin and isobarbaloin were well separated by MEKC and as little as 5.5 pg/11 nl of the three compounds could be detected. The determination took around 14 min.

Capillary electrophoresis of drugs: current status in the analysis of pharmaceuticals

The current status of capillary electrophoresis (CE) in pharmaceutical analyses is reviewed with about 300 references, mainly from 1996 until 1999. This article covers the use of CE for assay and purity determination of the main component, analysis of natural medicines, antisense DNA, peptides, and proteins. Analysis of hydrophobic and/or electrically neutral drugs by electrokinetic chromatography, capillary electrochromatography and nonaqueous CE is critically evaluated. Detailed techniques for the separation of enantiomers are given in the text with some actual applications. Furthermore, this review includes sensitivity and regulatory aspects for the actual use of CE in new drug applications (NDA). The analytical validation required for CE in NDA is also treated.