• Analytical Science and Technology
• /
• v.6 no.4
• /
• pp.395-399
• /
• 1993

Corynoxeine, rhynchophylline, isocorynoxeine, isorhychophylline were isolated from Uncaria hooks and determined by HPLC. Their contents were : isocorynoxeine 0.21%, isorhynchophylline 0.16%, corynoxeine 0.28%, rhynchophylline 0.23%, respectively. Corynoxeine and isocorynoxeine, rhynchophylline and isorhychophylline were interconverted each other by heat treatment.