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  • Title: Preparative isolation of pseudolaric acids A and B, and their glucosides from the root bark of Pseudolarix kaempferi using high-speed counter-current chromatography.
    Author: Han QB, Wong L, Lai F, Yang NY, Song JZ, Qiao CF, Xu HX.
    Journal: J Sep Sci; 2009 Jan; 32(2):309-13. PubMed ID: 19072902.
    Abstract:
    In order to provide the chemical markers for the quality control of herbal medicines, four diterpenoids, pseudolaric acids A and B (PAA and PAB), and their glucosides were isolated from the methanol extract of the Chinese herb Pseudolarix kaempferi using high-speed counter-current chromatography (HSCCC). The diphase solvent system was n-hexane/EtOAc/MeOH/H(2)O which was used at two ratios (5:5:5:5 and 1:9:4:6 by volume) in the separation of pseudolaric acids and their glycosides, respectively. As a result, PAA (14 mg), PAB (129 mg), PAA-O-beta-D-glucopyranoside (8 mg, PAAG), and PAB-O-beta-D-glucopyranoside (42 mg, PABG) were obtained from 0.5 g of the crude extract. Their purities were determined to be above 97% by HPLC analysis. Their chemical structures were confirmed by( 1)H and( 13)C NMR analysis or HPLC comparison with the reference compounds.
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