Abstract:
Five diterpenoid lactones, 14- deoxy-11,12-didehydroandrographolide, andrographolide, neoandrographolide, 14-deoxyandrographolide-19 β-D-glucoside, and andrographiside were isolated from the aerial part of Andrographis paniculata Nees by chromatographic techniques and crystallization. The physic-chemical properties of these compounds were determined. The assignment of carbons and protons in the structures were achieved by application of one dimensional and two dimensional nuclear magnetic resonance spectroscopy which included proton NMR, carbon-13 NMR, DEPT, H,H COSY, and C,H COSY. The spectroscopic data could be used as reference data for structure elucidation of the compounds which have similar type of diterpenoid lactone structure.