中国南海海绵Seletta tenuis lindgren中24-亚甲基-27-甲基胆甾醇的结构鉴定

本研究中国南海海绵生物活性成分的过程中,从南海海绵中分离出24-亚甲基-27-甲基胆甾醇,通过IR,^1HNMR,^13CNMR,^1H-^13CCOSY,MS和MS-MS等波谱分析,确证了其化学结构,并详细报道了波谱数据.     

直缘乌头中新的C19—二萜生物碱的结构研究

从直缘乌头（Aconitum transsectum Diels.）根中分离得到4个新的乌头碱型 C_(19)-二萜生物碱。由光谱法（IR, ~1H NMR, ~(13)C NMR, 2D-NMR, MS）确定其 结构为:8-O-乙基滇乌碱（8-O-ethylyunaconitine） (1)、去氮乙基查斯曼宁（N- deethyl chasmanine）(2)、直缘乌碱丁（transconitine D）(3)和直缘乌碱戊（ transconitine E）(4)。     

杂环生物碱类化合物的分离及结构鉴定

首次报道从中国南海西沙群岛海绵spongiaobligue中分离得到3个新的含氮生物碱杂环化合物,通过MS,1DNMR,20NMR等波谱数据及元素分析确定它们的结构。     

稀土单酞菁化合物的NMR研究

研究了从Sm^3^+到Lu^3^+(Gd^3^+除外)九个稀土单酞菁化合物的^1H NMR化学位移.发现对重稀土化合物,酞菁环上α、β质子诱导位移符号的变化呈现"三个一组效应".即,"Tb^3^+、Dy^3^+、Ho^3^+化合物,^1H共振谱线移向高场,而对Er^3^+、Tm^+^3、Yb^3^+化合物,则移向低场.化学位移的最大变化发生在4f^8构型(Tb^3^+)处.所得结果与Bleaney理论一致.测得部分稀土单酞菁化合物的^1^3C NMR谱,讨论了化学位移的变化.     

百部生物碱的化学研究 II. 细花百部中微量生物碱的结构研究

从海南岛产野生百部(Stemona parviflora Wright C.H.)的根部又分得三个微量生物碱成份, 其中羟基百部叶碱(oxystemofoline)(1)和甲氧代百部叶碱(methyloxystemofoline)(2)为新生物碱成份。经IR, MS, ^1H和^1^3C NMR, NOE, 2D-同核及异核相关谱以及远程偶合相关谱推定了它们的结构, 并首次归属了它们的^1^3CNMR信号。     

百部生物碱的化学研究 II. 细花百部中微量生物碱的结构研究

从海南岛产野生百部(Stemona parviflora Wright C.H.)的根部又分得三个微量生物碱成份, 其中羟基百部叶碱(oxystemofoline)(1)和甲氧代百部叶碱(methyloxystemofoline)(2)为新生物碱成份。经IR, MS, ^1H和^1^3C NMR, NOE, 2D-同核及异核相关谱以及远程偶合相关谱推定了它们的结构, 并首次归属了它们的^1^3CNMR信号。     

细花百部碱的结构

从海南岛产野生细花百部(Stemona parciflora Wright, C.H.)的根部分得一新生物碱-细花百部碱(parviatemonine), 根据MS, ^1H NMR去偶, ^1H-^1HCOSY , NOESY, ^1^3C-^1H异核相关谱, ^1^3C NMR及^1H NMR 宽峰效应等技术推定了结构, 在百部类生物碱中首次归属了质子和碳原子的NMR信号, 该结构业经X单晶衍射法证实。     

牛膝根中一活性寡糖(AbS)的分离和结构研究

牛膝具有补气强肾的功能, 从其根部可提取分离得到一水溶性的寡糖, 它具有显著的增强免疫功能的活性, 本文报导牛膝根中一活性寡糖(Abs)的结构研究。     

几种齐墩果酸糖缀合物的合成

报道了齐墩果酸与四种单糖和二糖（葡萄糖、半乳糖、乳糖及葡萄糖醛酸）进 行糖苷化制备糖缀合物的方法。在合成过程中首先将葡萄糖、半乳糖及乳糖转化成 相应的全苯甲酰三氯亚胺酯糖基供体（10a-10c），将葡萄糖醛酸转化成为1-溴代 乙酰葡萄糖醛酸甲酯糖基供体（10d）；在齐墩果酸的28-位羧基上进行酰胺化引入 ω-氨基羧酸甲酯得到其衍生物6。然后10a-10c在TMSOTf的催化下与化合物6的3-位 羟基进行β-糖苷化；10d在AgOTf的催化下与6进行β-糖苷化，最后脱掉保护基得 到相应的糖缀合物13a-13d，所有目的化合物均为新化合物，其结构经IR，^1H NMR，^13C NMR，2D-COSY，HMQC，DEPT及HRMS进行了确证。     

四川轮环藤根中两种海岛轮环藤-N-氧化物的分离鉴定

从中国特有植物四川轮环藤(Cyclea sutchuenensis Gagnep.)根中分得两种海岛轮环藤碱-N-氧化物。采用波谱分析和化学方法鉴定, 证明分别为海岛轮环藤碱-2β-N-氧化物(3)和海岛轮环藤碱-2'β-N-氧化物(4)。二者均为新生物碱, 是首尾氧桥双苄基异喹啉生物碱-N-氧化物。从该植物根中还分得已知的海岛轮环藤碱(1)和海岛轮环藤酚碱(2)。本文首次详细报道并分析了2的1^H NMR和13^C NMR数据。经三种人癌细胞实验, 证明2具有显著的抗癌活性。     

海绵Phacellia fusca Schmidt中一个结构新颖的脑甙类化合物

从采自中国南海西沙群岛海域的海绵Phacellia fusca Schmidt中得到了一种结构新颖的脑甙类化合物 Phacelliacerebroside A.经¹HNMR、¹³CNMR, HMQC、¹H-¹HCOSY、NOE、FABMS和GC-MS 等光谱分析,确证其结构为长链碱(LCB)含3个自由羟基的α-葡萄糖苷神经酰胺,命名为 Phacelliacerebroside A.这是Phakellia sp.海绵中首次报道的脑甙类化合物.     

Isolation and Crystal Structure of 2—Bromoaldisin

INTRODUCTION2-Bromoaldisin was first isolated from the marine sponge Hymeniacidon aldis [1,2]. In the course of our systematic search for bioactive substances from marine organisms, we have studied the marine sponge Phacellia fusca Schmidt and obtained the title compound. Up to now, there is no report on the crystal structure of 2-bromoaldisin. This paper reports the isolation and crystal structure of it. EXPERIMENTALIsolation of 2-bromoaldisinThe sponge, Phacellia fusca Schmidt wa…     

Natural Products from the Marine Sponge Subgenus Reniera

Marine sponges are one of the prolific producers of bioactive natural products with therapeutic potential. As an important subgenus of Haliclona, Reniera sponges are mainly distributed in the Mediterranean Sea and Atlantic area, and had been chemically investigated for over four decades. By an extensive literature search, this review first makes a comprehensive summary of all natural products from Reniera sponges and their endozoic microbes, as well as biological properties. Perspectives on strengthening the chemical study of Reniera sponges for new drug-lead discovery are provided in this work.     

A Novel Pyrrololactam Alkaloid from the South China Sea Sponge Phacellia Fusca Schmidt

Pyrrololactam type of alkaloids was found in many marine sponges which belong to the family Axinellidae. In the course of our systematic research for bioactive substances in marine organisms, we studied the sponge Phacellia fusca Schmidt which also belongs to the family Axinelldae. From the chloroform-soluble fraction, ten A-nor-sterols were isolated and identified, while from the water-soluble portion, three known pyrrololactam alkaloids and a new pyrrololactam alkaloid, which was named fuscin, were obtained. The present paper contains the isolation and structure determination of fuscin (1).     

南海海绵Biemna fortis中一种环二氧甾醇

从中国南海海绵Biemnafortis的乙酸乙酯可溶部分分离出一个已知的有机化合物 ,经IR ,EIMS ,1HNMR等光谱分析确定其化学结构式为 :5α ,8α -环二氧 -2 4 ξ -甲基胆甾 -6,2 2 -二烯 -3 β -醇。     

南海海绵Iotrochota ridley化学成分的研究(-)

从中国南海海绵Iotrochotaridley中分离到一种长链甘油醚，其结构经IR，MS，1HNMR，13CNMR，1H－1HCOSY确定为3-十八烷氧基-1，2-丙二醇（鲨肝醇）（Ⅰ）。本文是首次报道该种属海绵的化学成分。     

Anthracene and Pyrene Biodegradation Performance of Marine Sponge Symbiont Bacteria Consortium

Every petroleum-processing plant produces sewage sludge containing several types of polycyclic aromatic hydrocarbons (PAHs). The degradation of PAHs via physical, biological, and chemical methods is not yet efficient. Among biological methods, the use of marine sponge symbiont bacteria is considered an alternative and promising approach in the degradation of and reduction in PAHs. This study aimed to explore the potential performance of a consortium of sponge symbiont bacteria in degrading anthracene and pyrene. Three bacterial species (Bacillus pumilus strain GLB197, Pseudomonas stutzeri strain SLG510A3-8, and Acinetobacter calcoaceticus strain SLCDA 976) were mixed to form the consortium. The interaction between the bacterial consortium suspension and PAH components was measured at 5 day intervals for 25 days. The biodegradation performance of bacteria on PAH samples was determined on the basis of five biodegradation parameters. The analysis results showed a decrease in the concentration of anthracene (21.89%) and pyrene (7.71%), equivalent to a ratio of 3:1, followed by a decrease in the abundance of anthracene (60.30%) and pyrene (27.52%), equivalent to a ratio of 2:1. The level of pyrene degradation was lower than that of the anthracene due to fact that pyrene is more toxic and has a more stable molecular structure, which hinders its metabolism by bacterial cells. The products from the biodegradation of the two PAHs are alcohols, aldehydes, carboxylic acids, and a small proportion of aromatic hydrocarbon components.     

沐浴海绵Spongia zimocca aubspecles irregularia(Lendenfeld)中的含氮化合物

从沐浴海绵Spongia zimocca aubspecles irregularia(Lendenfeld)分离和处理得到3种含氮化合物,通过波谱法鉴定化学结构,化合物1为新的神经酰胺N-2-(1,3-二羟基-十五烷基)-2′,20′-二十一酰胺,2为神经酰胺(E)-N-2-(1,3-二羟基-4-十八烯基)-十六酰胺,3为醋酸胍.     

式根岛海绵活性物质及功能宏基因组学的应用

式根岛海绵及其高度复杂的共生体系是生物活性物质的丰富重要来源, 产生以calyculins为主要成分的毒性物质. 活性物质含量低, 使得直接从海绵分离大量活性物质不可取. 海绵共生菌是活性物质的主要生产者, 但是大部分的共生菌是不可培养的, 使得单纯的分离培养不能发挥很好的作用. 功能宏基因组学避开了培养的瓶颈, 可以获取独特的活性物质及其功能基因. 对式根岛海绵2013年2月以前分离出的活性物质作一综述, 并对非培养依赖型的功能宏基因组学, 在蕴含大量不可培养微生物的式根岛海绵中的应用进行综述. 探讨功能宏基因组在研究开发式根岛海绵及其他海绵的活性物质及有趣功能基因中的应用潜能, 为研究国内海绵的丰富活性物质和有趣的基因提供一种思路和方法.     

A New Tetracyclic Bromopyrrole-Imidazole Derivative through Direct Chemical Diversification of Substances Present in Natural Product Extract from Marine Sponge Petrosia (Strongylophora) sp.

Chemical diversification of substances present in natural product extracts can lead to a number of natural product-like compounds with a better chance of desirable bioactivities. The aim of this work was to discover unprecedented chemical conversion and produce new compounds through a one-step reaction of substances present in the extracts of marine sponges. In this report, a new unnatural tetracyclic bromopyrrole-imidazole derivative, rac-6-OEt-cylindradine A (1), was created from a chemically diversified extract of the sponge Petrosia (Strongylophora) sp. We also confirmed that 1 originated from naturally occurring (-)-cylindradine A (2) via a new reaction pattern. Moreover, (-)-dibromophakellin (3) and 4,5-dibromopyrrole-2-carboxylic acid (4), as well as 2, were reported herein for the first time in this genus. Studies on the possible reaction mechanism and bioactivities were also conducted. The results indicate that the direct chemical diversification of substances present in natural product extracts can be a speedy and useful strategy for the discovery of new compounds.