Abstract
Tubers of Corydalis turtschaninovii were extracted with 80% aqueous methanol (MeOH), and the concentrated extract was successively partitioned with n-hexane, ethyl acetate (EtOAc), butanol (n-BuOH), and H2O. An activity-guided fractionation to search for insecticidal compounds against aphids led to the isolation of six alkaloids from the n-hexane and EtOAc fractions using a repeated silica gel, an octadecyl silica gel (ODS), and Sephadex LH-20 column chromatographic separations. Based on the spectroscopic data of NMR, mass spectroscopy (MS), and IR, the chemical structures of the compounds were determined to be: (+)-stylopine (1), (+)-corydaline (2), demethylcorydalmine (3), isocorypalmine (4), glaucine (5), and pseudoprotopine (6). These compounds showed significant insecticidal effects against Aphis gossypii, 69.7±7.2, 46.9±2.4, 68.5±8.6, 75.5±4.2, 80.2±9.7, and 78.9±11.3% at 1,000 ppm, respectively.
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