Antimicrobial indole alkaloids from Tabernaemontana corymbosa / 中国天然药物

Four unreported monoterpene indole alkaloids, tabernaecorymines B-E (1-4), together with twenty-one known indole alkaloids (5-25) were obtained from the stem bark of Tabernaemontana corymbosa. Their structures and absolute configurations were elucidated by extensive spectroscopy, quantum chemical calculations, DP4+ probability analyses and Mo2(OAc)4-induced electronic circular dichroism experiment. The antibacterial and antifungal activities of these compounds were evaluated and some of them showed significant activity against Staphylococcus aureus,Bacillus subtilis, Streptococcus dysgalactiae and Candida albicans.

Protective Effects of Rosemary's Extract on Cerebral Ischemia in Mice and Acute Toxicity Evaluation / 昆明医科大学学报

Objective To evaluate the protective effects of Rosemary's chloroform extract on cerebral ischemia in mice and acute toxicity.Methods The protective of rosemary's chloroform extract on cerebral ischemia was observed and compared by the mice models of cerebral anoxia and ischemia,thrombus formation in vivo,and chloroform induced arrhythmias.Rosemary's Chloroform Extract was given orally to mice to evaluate acute toxicity.Results Rosemary's chloroform extract had different degrees of inhibition of collagen-the adrenaline induced thrombus formation,and prolonged acute ischemic mice brains off mouth breathing time and increase the number of mouth breathing (P ＜0.05 or P ＜0.01);Chloroform extract significantly reduced the incidence of chloroform induced ventricular arrhythmias.Acute toxicity results suggested that a female rat died in the next day of chloroform extract group,no additional toxicity was observed.Conclusion Rosemary's chloroforrm extract has significant protective effect on cerebral ischemia and hypoxia in mice.

Chemical constituents of Excoecaria acerifclia / 中国中药杂志

<p><b>OBJECTIVE</b>To study the chemical constituents of Excoecaria acerifclia.</p><p><b>METHOD</b>Column chromatography on Silica gel and Sephadex LH-20 were applied for isolation and purification of the constituents. The structures were elucidated on the basis of spectrascopic analysis, chemical evidences and by comparison with the data reported in the literature.</p><p><b>RESULT</b>From the crude EtOAc fraction of Excoecaria acerifclia F. Didr, 14 compounds were isolated and identified as 7,8-trans-4,5,9-trihydroxy-3,3',9'-trimethoxy-7-O-5',8-O-4'-neolignan (1), 7,8-trans 4,5,9,9'-tetrahydroxy-3,3'-dimethoxy-7-O-5',8-O-4'-neolignan (2), malloapelin C (3), sy-ringaresinol (4), 2alpha,3beta,24-trihydroxy-12-ursen-28-oic acid (5), 11-hydroxy-3-oxo-12-ursen-28-oic acid (6), 6-hydroxy-20 (29)-lupen-3-one (7), isolupenyl acetate (8), kaempferol (9), quercetin (10), apigenin (11), catechin (12), kamepferol-3-O-beta-D-galactopyranoside (13), and catechin (6-->8) catechin (14).</p><p><b>CONCLUSIONS</b>Compound 1 was new, the remained compounds were isolated and identified from E. acerifclia for the first time. Among them, compounds 5-8 are triterpenoids, while the other compounds are phenylpropanoids.</p>