A new diimide derivative from the co-culture broth of two mangrove fungi (strain no. E33 and K38)

A new diimide derivative, named ( ? )-byssochlamic acid bisdiimide (1), was isolated from the mixed broth of two mangrove fungi (strain no. K38 and E33) from the South China sea coast. The structure of 1 was determined by comprehensive spectroscopic methods, including 1D and 2D NMR (COSY, HMQC, and HMBC) and semi-synthesis. Primary bioassays showed that 1 had weak cytotoxic activity against Hep-2 and HepG2 cells.     

角果木根茎的石油醚部位化学成分研究

目的 对红树林植物角果木根茎的石油醚部分的化学成分进行分离鉴定。方法 运用硅胶柱色谱、凝胶柱色谱和HPLC制备液相色谱进行分离,确定了化合物的结构。结果 分离得到8个化合物,分别鉴定为tagalsin C（1）、tagalsin E（2）、tagalsin F（3）、tagalsin G（4）、tagalsin O（5）、tagalsin I（6）、tagalsin L（7）、tagalsin M（8）。化合物1～5为二萜类化合物,化合物6～8为四萜类化合物。结论 角果木根茎的石油醚部位的主要化学成分为萜类化合物。     

海南角果木中1个新的苯丙素类化合物

目的研究海南红树植物角果木Ceriops tagal醋酸乙酯部位的化学成分。方法采用溶剂法进行提取和萃取,通过多种柱色谱、重结晶及高效液相色谱等方法进行分离纯化;利用理化性质,并结合现代分析方法鉴定化合物的结构。结果从海南红树植物角果木醋酸乙酯部位分离得到8个化合物,分别鉴定为(E)-3-(5-羟基-2,3,4-三甲氧基苯基)丙烯酸甲酯(1)、3-(3-羟基-2,4,5-三甲氧基苯基)丙烯酸甲酯(2)、松柏醛(3)、2,3-二甲氧基-5-(1-丙烯基)苯酚(4)、丁香酸甲酯(5)、丁香醛(6)、银松素甲醚(7)、棕榈酸(8)。结论化合物1为新的苯丙素类化合物,命名为角果木苯丙素C,化合物4～8为首次从该植物中分离得到。     

Antimicrobial Activity of Acanthus ilicifolius (L.)

The antimicrobial activity of alcoholic, butanolic and chloroform extracts of leaves and roots of the plant Acanthus ilicifolius ware studied. Ampicillin and clotrimazole were used as standard antibacterial and antifungal agents respectively. The result of the study revealed that the alcoholic extract and chloroform extract of leaves exhibited strong inhibitory action against Bacillus subtilis, Staphylococcus aureus, Candida albicans, Aspergillus fumigatus and Aspergillus niger and moderate inhibitory action against Pseudomonas aeruginosa and Proteus vulgaris. The rest of the extracts showed moderate activity.     

Scyphiphin D,a new iridoid glucoside dimer from Scyphiphora hydrophyllacea

From the aerial parts of Scyphiphora hydrophyllacea Gaertn. F., a new iridoid glucoside dimer scyphiphin D (1) and a known iridoid glucoside geniposidic acid (2) were isolated. The structure of this new compound was determined on the basis of HR-FAB-MS, IR, ¹H and ¹³C NMR (DEPT), and 2D NMR (HMQC, HMBC, COSY, ROESY) spectral data.     

(+)-Cyclopenol,a new naturally occurring 7-membered 2,5-dioxopiperazine alkaloid from the fungus Penicillium sclerotiorum endogenous with the Chinese mangrove Bruguiera gymnorrhiza

One new naturally occurring 7-membered 2,5-dioxopiperazine alkaloid named (+)-cyclopenol (1), along with nine known compounds including viridicatol (2), 3-(dimethylaminomethyl)-1-(1,1-dimethyl-2-propenyl)indole (3), anacine (4), aurantiomide C (5), viridicatin (6), 3-O-methylviridicatin (7), verrucosidin (8), ergosterol (9), and ergosterol peroxide (10), was isolated from the EtOAc extract of fungus Penicillium sclerotiorum, an endophytic fungal strain isolated from Chinese mangrove Bruguiera gymnorrhiza. The chemical structure of the new compound 1 was elucidated on the basis of detailed spectroscopic analysis. The absolute configuration of 1 was determined by single-crystal X-ray analysis with Cu Kα radiation (λ = 1.54178 Å). To our knowledge, (+)-cyclopenol (1) represents the first example of 7-membered 2,5-dioxopiperazine isolated from mangrove endophytic fungus.     

A new α-pyrone metabolite from a mangrove plant endophytic fungus,Fusarium sp.

A new α-pyrone derivative, compound 2, and a known one, cladobotrin V, were isolated from the culture broth of the mangrove endophyte Fusarium sp. IM-37. Their structures were determined spectroscopically and compared with previously reported spectral data. Compound 2 restored the growth inhibition caused by hyperactivated Ca²⁺-signaling in mutant yeast.     

半红树植物水黄皮的化学成分研究

目的 为了探索中国南海红树林生态系统中代谢产物的结构多样性及其生物活性,对半红树植物水黄皮树干乙醇提取物低极性部位进行了初步的化学成分研究,方法采用多种色谱方法进行分离纯化,波谱方法结合文献对照鉴定结构.结果 分离并鉴定了10个化舍物,分别是Isopongaglabol(Ⅰ)、Pongaglabol methyl ether(Ⅱ)、水黄皮异黄酮素(Ⅲ)、水黄皮根素(Ⅳ)、7-甲氧基异黄酮(Ⅴ)、过氧化麦角甾醇(Ⅵ),羽扇豆醇(Ⅶ),白桦脂酸(Ⅷ),11α-羟基-β-香树脂醇(Ⅸ),β-谷甾醇(Ⅹ).结论 其中化合物Ⅴ为新天然产物,化舍物Ⅶ和Ⅹ对几种肿瘤细胞靶蛋白酶表现出抑制活性.     

红树林细菌Bacillus sp．次生代谢产物研究

目的研究红树林细菌Bacillus sp．发酵液中的化学成分。方法采用各种色谱方法进行成分分离，综合运用多种波谱学手段确定单体化合物的结构。结果从一株红树林细菌Bacillus sp．的发酵物中分离得到6个单体化合物和一个混合物，单体化合物分别鉴定为N-oleoyl-threonine（1）、大豆素（2）、尿嘧啶（3）、胸腺嘧啶（4）、腺嘌呤核苷（5）、腺嘌呤脱氧核苷（6），混合物鉴定为环（脯-甘）二肽（7）和1，5-dideoxy-3-C-methyl-arabinitd（8）。结论化合物1、8为首次从该属菌株中分离得到。     

红树林植物海榄雌化学成分研究

目的研究红树林植物海榄雌Avicennia marina枝、叶的化学成分。方法采用硅胶柱色谱、葡聚糖凝胶SephadexLH-20柱色谱、HPLC等方法分离纯化,通过现代波谱技术鉴定其结构。结果从海榄雌枝、叶的提取物中分离获得10个化合物,鉴定结构分别为acteoside(Ⅰ)、isoacteoside(Ⅱ)、syringaresinol(Ⅲ)、5,7-二羟基-3′,4′,5′-三甲氧基黄酮(Ⅳ)、3-吲哚甲酸(Ⅴ)、白桦酸(Ⅵ)、白桦醇(Ⅶ)、羽扇豆醇(Ⅷ)、白骨壤醌C(Ⅸ)和山柰酚(Ⅹ)。结论化合物Ⅰ～Ⅵ为首次从该植物中分离得到。