Two new brominated diterpenes from Laurencia decumbens

Two new brominated diterpenes,namely,laurendecumtriol and 11-deacetylpinnaterpene C,were isolated and identified from the marine red alga Laurencia decumbens.Their structures were established on the basis of various NMR spectroscopic techniques and HR-ESI-MS analyses.     

Sesquiterpenes and Other Metabolites from the Marine Red Alga Laurencia composita (Rhodomelaceae)

Two new halogenated sesquiterpenes, (8β)‐10‐bromo‐3‐chloro‐2,7‐epoxychamigr‐9‐en‐8‐ol ( 1 ) and 2‐bromo‐3‐chlorobisabola‐7(14),11‐diene‐6,10‐diol ( 3 ), and one new phytol‐derived diterpene, 2,3‐epoxyphytyl acetate ( 4 ), along with cis‐ and trans‐1‐methylcyclohexane‐1,4‐diol ( 5 and 6 ) which were isolated from a natural source for the first time but have been previously synthesized, were isolated from the marine red alga Laurencia composita and characterized. In addition, a known sesquiterpene, pacifenediol ( 2 ), and the known furanone derivative 7 were also identified. Their structures were established by NMR and mass spectroscopic methods.     

Direct Electrochemistry of Myoglobin in DDAB-Clay Composite Films

Direct electrochemistry of redox proteins can provide a good model for the studies of redox process in biological system Electron transfer between redox metalloproteins and underlying electrodes was greatly enhanced in lamillar liquid crystal surfactant films compared to that on bare electrodes with the puoteins in solution1,because these filmsprovide a favorable biomebrane-like micuoencironment for the puwtins2 Orderedsurfactant-clay composite films in which anionic clay platelet layers sandw…     

N,N'-双(膦酰基苯基次甲基)-2-咪唑啉酮及2,3-哌嗪二酮的合成

许多天然存在和人工合成的氨基磷酸因具有抗菌、除草、植物生长调节等多方面的生物活性，从而使这一领域的研究十分活跃［’］。而２一咪哩琳酮和２，３一派嗓Ｍ酮也是具有除草、杀菌等多种生物活性的化合物Ｉ’］，因此我们设计将ａ一氨基磷酸引入到２一眯吃财酮及２，３服喀二酮的结构中，设计并合成了Ｉｌｌ、Ｗ两类新化合物，以期找到高生物活性的化合物。１实验部分ＢｒｕｋｅｒＡＣ．Ｐ２００型核磁共振仪，ＴＭＳ为内标，溶剂ＣＤＣ１３；ＶＧＺＡＢ－ＨＳ型质谱仪；Ｙａｎａｃｏ．ＣＨＮＣＯＲＤＥＲＭＴ－３型元素自动分析仪；硅胶…     

口虾蛄小颚腺的显微结构

对口虾蛄小鄂腺的组成及各部分显微形态结构进行了研究。发现小颚腺由体腔囊、迷路和原肾管组成，无膀胱。体腔囊足细胞小，足状突起少；迷路细胞具有微绒毛且基底侧质膜内陷；原肾管细胞的微绒毛较短，数量少，但基底侧质膜内陷更深更宽。口虾蛄小颚腺相关的细胞结构虽较为原始，不很发达，但其基本生理能力应与日本沼虾的触角腺类似，即具排泄和渗透压调节功能。     

Determination of chlorophenols in red wine using ionic liquid countercurrent chromatography as a new pretreatment method followed by high‐performance liquid chromatography

A countercurrent chromatography method for the enrichment and cleanup of chlorophenols from food samples was successfully established by using an ionic‐liquid‐modified two‐phase solvent system composed of dichloromethane containing 2% 1‐butyl‐3‐methylimidazolium bis(trifluoromethanesulfonyl)imide and water. The column was firstly filled with the organic stationary phase, and then a large volume of sample was pumped into the column after it was equilibrated with pure water at the rotation speed. Finally, the trace amounts of chlorophenols extracted and enriched in the stationary phase were eluted out by an alkaline mobile phase and determined by high‐performance liquid chromatography. Under optimized conditions, the enrichment and cleanup of the chlorophenols can be fulfilled online with enrichment factors (34–65) and high recoveries (84.69–95.23%). The method has been applied to the determination of chlorophenols in real red wine samples with the limits of detection in the range of 1.89–4.21 μg/L. The present method is highly suitable for the pretreatment of large volume of aqueous sample for the determination of trace amounts of contaminants in food and environmental samples.     

XPS and AFM characterization of the self‐assembled molecular monolayers of a 3‐aminopropyltrimethoxysilane on silicon surface,and effects of substrate pretreatment by UV‐irradiation

The self‐assembled (SA) molecular monolayers of a 3‐aminopropyltrimethoxysilane (3‐APTS) on a silicon (111) surface, and the effects of ultraviolet (UV) pre‐treatment for substrates on the assembling process have been studied using XPS and atomic force microscopy (AFM). The results show that the SA 3‐APTS molecules are bonded to the substrate surface in a nearly vertical orientation, with a thickness of the monolayer of about 0.8–1.5 nm. The SA molecular monolayers show a substantial degree of disorder in molecular packing, which are believed to result from the interactions of amine tails in the silane molecules used with surface functionalities of the substrates, and the oxygen‐containing species from the ambient. UV irradiation for silicon substrates prior to the self‐assembly reaction can enhance the assembly process and hence, significantly increase the coverage of the monolayer assembled for the substrates. Copyright © 2010 John Wiley & Sons, Ltd.     

Two new aristolane sesquiterpenes from Laurencia similis

Two new aristolane sesquiterpenes, namely, aristolan-10-ol-9-one and aristolan-8-en-1-one, were isolated from the red alga Laurencia similis. Their structures were established on the basis of various NMR spectroscopic analyses, including 2D NMR techniques (1H-1H COSY, HMQC, HMBC, and NOESY) and HR-FAB-MS.