ABSTRACT
italic>Psidium guajava Linn. is an evergreen shrub or small tree of Psidium Linnaeus in the Myrtaceae family. One new glycoside (1) together with 3 known meroterpenoids (2-4) and 9 known glycosides (5-13) were isolated from the fruits of Psidium guajava Linn.. The structure of the new compound was elucidated by the spectroscopic data analysis of HR-ESIMS, 1D- and 2D-NMR, and it was named psiguaoside A (1). The known compounds were identified as guajadial (2), 4,5-diepipsidial A (3), psidial A (4), chrysin-8-C-β-D-glucoside (5), 2,6-dihydroxy-3,5-dimethyl-4-O-β-D-glucopyranosyl-benzophenone (6), quercetin-3-O-β-D-glucopyranoside (7), quercetin-3-O-xyloside (8), guaijaverin (9), avicularin (10), guavinoside E (11), guavinoside B (12), guajaphenone A (13). In the bioactivity assay, compound 3 exhibited significant inhibitory activitiy of U87 with IC50 values of 8.379 μmol·L-1.
ABSTRACT
A new carbazole alkaloid was isolated from the aqueous extract of the stems of Clausena lansium (Lour.) Skeels by various chromatographic methods, including HPD-100, PRP-512A, silica gel, and reverse phase C18. Its structure was determined by spectroscopic and chemical methods, including UV, IR, HR-ESI-MS, 1D/2DNMR and ECD. Compound 1, named as Claulamine F, showed no antimicrobial activity on Staphylococcus aureus, Escherichia coli or Pseudomonas aeruginosa. In addition, compound 1 exhibited no cytotoxicity on five kinds of cancer cells through MTT methods.
ABSTRACT
One undescribed and two known furocoumarins were isolated from the stems of the Clausenalansium through a series of isolation and purification approaches including HPD-100 macroporous resin column, silica gel, reverse phase C18 and so on. Their structures were determined to be 8-[(2S,3S,6E)-2,3-epoxy-3,7-dimethyl-oct-6-enyloxy] psoralen (1), 8-(7',8'-epoxygeranyloxy) psoralen (2) and 8-[(2E)-6-oxo-3,7-dimethyloct-2-enyloxy] psoralen (3) by spectroscopic methods. Compound 1 is a new furocoumarin. Compound 2 showed cytotoxicity to H460 (IC50 = 43.94 μmol·L-1) and compound 3 showed cytotoxicity to HeLa (33.76 μmol·L-1) through the cytotoxic tests against five human cancer cell lines (H460, H7402, HCT-8, HeLa and MCF-7) for all compounds.