快捷、简单、高效的分离蒽醌类化合物的方法

用砂芯漏斗为分离柱,薄层层析硅胶作为填料,选择二氯甲烷代替苯和乙酸乙酯的流动相,利用循环水泵产生负压的方法,能快捷、简便、高效的分离6-溴甲基-1,3,8-三甲氧基-9,10-蒽醌中间体和其它蒽醌类化合物,并且纯度高.     

Natural Products and Their Derivatives against Human Herpesvirus Infection

Herpesviruses establish long-term latent infection for the life of the host and are known to cause numerous diseases. The prevalence of viral infection is significantly increased and causes a worldwide challenge in terms of health issues due to drug resistance. Prolonged treatment with conventional antiviral drugs is more likely to develop drug-resistant strains due to mutations of thymidine nucleoside kinase or DNA polymerase. Hence, the development of alternative treatments is clearly required. Natural products and their derivatives have played a significant role in treating herpesvirus infection rather than nucleoside analogs in drug-resistant strains with minimal undesirable effects and different mechanisms of action. Numerous plants, animals, fungi, and bacteria-derived compounds have been proved to be efficient and safe for treating human herpesvirus infection. This review covers the natural antiherpetic agents with the chemical structural class of alkaloids, flavonoids, terpenoids, polyphenols, anthraquinones, anthracyclines, and miscellaneous compounds, and their antiviral mechanisms have been summarized. This review would be helpful to get a better grasp of anti-herpesvirus activity of natural products and their derivatives, and to evaluate the feasibility of natural compounds as an alternative therapy against herpesvirus infections in humans.     

Exploratory Quality Control Study for Polygonum multiflorum Thunb. Using Dinuclear Anthraquinones with Potential Hepatotoxicity

In recent years, the hepatotoxicity of Polygoni Multiflora Radix (PMR) has attracted increased research interest. Some studies suggest that anthraquinone may be the main hepatotoxic component. Most of the relevant studies have focused on the mononuclear anthraquinone component rather than binuclear anthraquinones. The hepatotoxicity of dinuclear anthraquinone (dianthrone) was investigated in a cell-based model. Next, a method for the determination of six free and total dianthonones in PMR and PMR Praeparata (PMRP) was established using ultra-high-performance liquid chromatography triple quadrupole mass spectrometry (UPLC-QQQ-MS/MS), which was then used to analyze the collected samples. The data show that four binuclear anthraquinone compounds were hepatotoxic and may be potential toxicity indicators for the safety evaluation of PMR and PMRP. Herein, we provide a theoretical basis for the improvement of PMRP quality standards.     

Determination of Lucidin in Rubia tinctorum Aglycones by an HPLC Method with Isocratic Elution

An HPLC method has been developed for the separation of anthraquinones with particular attention to the determination of lucidin in commercially available sources of Rubia tinctorum aglycones. Variations of chromatographic conditions have been studied in order to provide suitable resolution of anthraquinones under isocratic conditions on an end‐capped RP C18‐column.     

Separation of rhubarb anthraquinones by capillary electrochromatography

Summary A rapid, simple method for packing capillary electrochromatography (CEC) columns with HPLC stationary phases is described. The basis of the method is the use of a vacuum to suck a slurry of stationary phase into the fused-silica tubing, a procedure which takes approximately ten seconds only, then compression of the stationary phase by means of an HPLC pump. These packed CEC columns have been investigated for the separation of five anthraquinones from rhubarb. Separation of the anthraquinones inRheum palmatum L. under optimized conditions is presented.     

应用固定化Baker's酵母还原醌类化合物的研究

苯醌、萘醌和蒽醌类化合物在水溶液中能被固定化Baker's酵母还原。本文研究了影响固定化Baker's酵母还原活性、醌类化合物还原速度的因素及还原产物的分离和稳定性。     

Electroactive self-assembled monolayers of unique geometric structures by using rigid norbornylogous bridges

Herein, we describe the synthesis of straight (S) and L-shaped (L) norbornylogous bridges (NBs) with an anthraquinone moiety at the distal end as the redox-active head group and two thiol feet at the proximal end, by which the molecules assemble on gold surfaces. The NB molecules were shown to form self-assembled monolayers (SAMs) with a well-behaved surface redox process. The SAMs were characterized by using in situ IR spectroscopy, cyclic voltammetry, scanning tunnelling microscopy and electrochemical impedance spectroscopy. The surface selection rules associated with the IR band intensities allowed the estimation of the position of the anthraquinone moiety with respect to the surface and the tilt of the bridge with respect to the surface normal, both in pure and diluted monolayers. It is shown that the S- and L-NBs hold the plane of the anthraquinone moiety close to the surface normal or the surface tangent, respectively. Neither NB molecule changes its orientation if spaced by diluents on the surface. The difference in the structure of the S- and L-NB SAMs provides a suitable framework for the investigation of factors that govern electron transfer of anthraquinone moieties across self-assembled monolayers with limited structural ambiguity, as compared with the commonly used structurally flexible alkanethiol monolayers.     

Photoconductivity of Crystalline Iodoform II: Photocurrents Induced by a Two-Photon Absorption

Photogeneration of charge carriers in iodoform has been studied using a high power pulsed dye laser as an excitation source. In the region of 480-640 nm, i.e. that of weak absorption, the magnitude of the photogenerated charge follows a square light intensity dependence in the intensity range employed (up to 10²³ photons/cm²s). The spectral dependence of the photogeneration efficiency is similar to that observed for the dc photoconductivity at twice shorter wavelengths; the efficiency drops down, however, rapidly when the tail of the first absorption band of iodoform is approached. Temperature anomalies below 270 K render the exact determination of activation energies impossible.     

A new anthraquinone from Morinda elliptica Ridl.

A new anthraquinone, morinquinone, together with 18 known anthraquinones were isolated from the stems of Morinda elliptica Ridl. Their structures were elucidated on the basis of spectroscopic data. They each showed weak inhibitory activity against a susceptible strain of Staphylococcus aureus and a methicillin-resistant S. aureus. Damnacanthal was effective against Microsporum gypseum (MIC 1 μg/mL). Lucidin was active against Entamoeba histolytica (MIC 31.25 μg/mL) and Giardia intestinalis (MIC 7.8 μg/mL).     

蒽醌衍生物在不同酸度溶液中的吸收光谱

蒽醌类化合物是一类古老的染料,对光和热非常稳定.某些蒽醌化合物还具有稳定的非晶态和晶态结构,在一定条件下可以进行相互转换,这种材料对强光具有非线性,有潜在的应用背景^[1].为此我们设计合成了两种新的蒽醌类化合物,测试了它们在溶液中的吸收光谱,研究了溶液酸碱性对吸收光谱的影响.