一种西沙掘海绵Dysidea sp.的化学成分研究

目的 对西沙掘海绵Dysidea sp.进行化学成分研究;方法 运用正相硅胶柱色谱、反相ODS柱色谱、凝胶Sephadex LH-20柱色谱以及高效液相色谱(HPLC)等多种分离手段对西沙掘海绵Dysidea sp.化学成分进行分离纯化;并通过理化性质、波谱学数据等结构信息鉴定其化合物的结构。结果发现：从西沙掘海绵Dysidea sp.中分离鉴定了8个化合物,分别为dictyoceratin C（1）、dactyloquinone B（2）、aminoquinone（3）、dictyoceratin A（4）、dactyloquinone D（5）、dactyloquinone E（6）、(1R*,2E,4R*,7E,10S*,11S*,12R*)-10,18-diacetoxydolabella-2,7-dien-6-one（7）和?,?-unsaturated ester（8）,结论 化合物1?6和8均为首次从该属海绵中分离得到。     

两种南海倔海绵Dysidea villosa和Dysidea marshalla的化学成分

目的：从我国南海2种倔海绵属（Dysidea）海绵Dysidea villosa和Dysidea marshalla中提取分离具有生物活性的化学成分。方法：运用硅胶柱层析和凝胶柱层析分别对上述2种海绵的丙酮提取物进行分离纯化,根据其化学性质,结合现代波谱技术（MS,NMR等）,对分离得到的化合物进行结构鉴定。结果：从海绵D.villosa中分离得到scalaradial（1）,scalarin（2）,12α-acetyl-19β,20α-dimethoxy-deoxascalarin（3）,12α-acetyl-19α,20α-dimethoxy-de-oxascalarin（4）,12-O-deaceyl-scalarin（5）,（24R）-5α,8α-环二氧-麦角甾-6,22-二烯-3-醇（6）,胆甾醇（7）,squalene（8）和δ-selinene（9）;从海绵D.marshalla中分离得到1～3,6～8。结论：化合物1对人白血病HL-60、人肝癌细胞BEL-7402及人乳腺癌MDA-MB-435等肿瘤细胞株表现出显著的抑制活性,其IC50分别为3.4,5.8和4.8μmol·L^-1。     

A new spiro-sesquiterpene from the sponge Dysidea fragilis

A new spiro-sesquiterpene, spirofragilin (1), along with a known related sesquiterpene, dehydroherbadysidolide (2), have been isolated from the marine sponge Dysidea fragilis collected in the South China Sea. The structure of 1 was elucidated on the basis of detailed spectroscopic analysis.     

O-methyl nakafuran-8 lactone, a new sesquiterpenoid from a hainan marine sponge Dysidea sp

A new sesquiterpenoid, O-methyl nakafuran-8 lactone (1) has been isolated from a Hainan sponge Dysidea sp. and the structure of the new compound proposed by spectral data, was confirmed by X-ray diffraction analysis. The complete ¹H- and ¹³C-NMR assignments were made on the basis of detailed 2D NMR spectral analysis.

Compound 1 showed strong inhibitory bioactivity against PTP1B with IC₅₀ value of 1.58 μM.     

酥脆掘海绵Dysidea fragilis中杂萜类化学成分

目的研究酥脆掘海绵Dysidea fragilis中杂萜类化学成分。方法采用硅胶柱色谱、反相ODS中压柱色谱以及半制备高效液相色谱等多种色谱技术进行分离纯化,所获得化合物采用HRMS、NMR等波谱方法进行鉴定,绝对构型则通过量子化学计算(ECD)法确定。结果从酥脆掘海绵的95%乙醇提取物中分离得到了3个杂萜类化合物和1个二萜类化合物,分别鉴定为酥脆内酯(1)、黑麦草内酯(2)、cavernosine(3)和dictyolE(4)。结论化合物1为新化合物,首次对化合物2的核磁数据进行了全归属,纠正了其C-6和C-8位碳信号归属的错误。     

西沙海绵Dysidea granulosa 化学成分研究

目的 研究中国西沙群岛海绵Dysidea granulosa的化学成分。 方法 利用薄层色谱、硅胶色谱、Sephadex LH-20色谱、MPLC、半制备HPLC等方法对化学成分进行分离纯化;通过NMR、MS等方法,并结合文献,鉴定化合物的结构。结果 从西沙海绵Dysidea granulosa的甲醇粗提取物中,分离得到6个化合物： Honulactone A (1), Honulactone B(2), Honulactone E (3), Honulactone F (4), 2-(2’,4’-Dibromophenoxy)-4,6-dibromophenol (5), 3,5-Dibromo-6-chloro-2-(2,4- dibromophenoxy)phenol (6)。结论 化合物1、2、3、4均为首次从该种海绵中分离得到。     

A new spiro-sesquiterpene from the sponge Dysidea fragilis

A new spiro-sesquiterpene, spirofragilin (1), along with a known related sesquiterpene, dehydroherbadysidolide (2), have been isolated from the marine sponge Dysidea fragilis collected in the South China Sea. The structure of 1 was elucidated on the basis of detailed spectroscopic analysis.     

Antifungal effect and possible mode of activity of a compound from the marine sponge Dysidea herbacea

OBJECTIVES: Assessment of antifungal activity of a compound isolated from the marine sponge Dysidea herbacea against the fungal pathogens Candida (primarily C. albicans) and Aspergillus (primarily A. fumigatus) species, and investigations of the possible mode of activity of the compound. METHODS: Freeze dried sponges were extracted with EtOAc-MeOH. Bioassay guided separation was used to identify the active compound. Antifungal activity was assessed in vitro by a modified NCCLS technique. For determination of the possible mode of activity of the compound we tested the effect on fungal cellular morphology (light, scanning and transmission electron microscopy) and possible site of activity in the fungal cells, such as cell membrane (ion leakage kinetics) as well as toxicity (cytotoxicity tests). RESULTS AND CONCLUSIONS: The active compound was determined to be 3,5-dibromo-2-(3,5-dibromo-2-methoxyphenoxy) phenol. This compound exhibited in vitro activity against the tested fungal pathogens. The experiments on the mode of activity revealed that there are significant changes in fungal cell morphology, as demonstrated by scanning and transmission electron microscopy. The compound, apparently, affects the fungal cell membrane, expressed primarily in leakage of potassium ions from the fungal cells. Two other bromo diphenyl ethers were also found to be active. Further experiments in in vivo models are planned.