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Tian Le LIN Bao Zhen YAN Gao Fei HU Mei WANG 《中国化学快报》2006,17(7):937-940
Complex formation between aluminium and quercetin(Q) in methanol was investigated by means of 27^Al solid-state, 13^C and 1^H NMR and MS(ESI), UV and IR spectra. Formation of the 1:2 complex was favored in methanol relative to all other solvent and the predominant species observed of Al(Ⅲ) has a 1:2 stoichiometry. The fine structure of 1:2 aluminum complex of quercetin was that the aluminum central atom chelated with two quereetin molecules and two methoxyl groups between two five membered rings, its coordination is six, the chelated site was 3-hydroxy-4-carbonyl. 相似文献
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JIANG Liu-Yun ① LIU Yu-Ming 《结构化学》2005,24(11):1340-1346
1 INTRODUCTION Quercetin(3,5,7,3?,4?-pentahydroxyflavone,see Fig. 1) is a kind of flavonol with many pharma-colo- gical actions, such as anti-flammatory, antiviral and antioxidation[1], but its antioxidation is weak. In re- cent years, it has been reported that quercetin can form metallic complexes by combining with some metal ions like copper ion, zinc ion, nickel and rare earth metals, and its antioxidative activity will be stronger than quercetin due to the existence of co- operative ef… 相似文献
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In this study, we have fabricated the functionalized nickel nanoparticles and investigated their effects on cellular uptake of quercetin in leukemia K562 cancer cells by using electrochemical assay. The results indicate that nickel nanoparticles could efficiently enhance the quercetin uptake and increase the intracellular accumulation in cancer cells, implying the great potential of functionalized nickel nanoparticles in target cancer therapy. 相似文献
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JIN Yin-zhe ROW Kyung Ho 《高等学校化学研究》2007,23(4):412-416
A molecular imprinted polymer(MIP)was prepared with quercetin as the template and methacrylic acid(MAA)as the functional monomer.Acetonitrile and methanol were used as the porogen with ethylene glycol dimethacrylate(EGDMA)as the crosslinker and 2,2'-azobis(isobutyronitrile)(AIBN)as the initiator.The experimental parameters of the equilibrium isotherms were estimated via linear and nonlinear regression analyses.The linear equation as the functions of the adsorption concentration of the single compound in its solution and the competitive adsorption of the single compound in its mixed compounds solution was then expressed,and the adsorption equilibrium data were correlated to Langmuir and Freundlich isotherm models.The mixture compounds show competitive adsorption on the specific binding sites of quercetin-MIP.Furthermore,the competitive Langmuir isotherms were applied to the mixture compounds.The adsorption concentrations of quercetin,( )catechin( C),and(-)epicatechin(EC)on the quercetin molecular imprinted polymer were compared.The quercetin-imprinted polymer shows extraordinarily higher adsorption ability for quercetin than for the two catechin compounds that were also assessed. 相似文献
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为探索典型(2His-COO)和非典型(3His,3His-COO及4His)配位的不同活性中心双加氧酶的结构-功能的相关性,本文以典型和非典型活性中心结构的L2NCOOH,L3N,L3NCOOH及L4N为模型配体,以3-羟基黄酮醇(3-hydroxyflavonol)为模型底物,合成和表征了一系列含Cu(Ⅱ)-栎精2,4-双加氧酶(CuⅡ-2,4-QD)的结构和功能ES模型配合物[CuⅡLn(fla)](n=2NCOO(1),n=3N(2),n=3NCOO(3)及n=4N(4)),并对其结构、性质、O2反应性及其相关性进行了研究.[CuⅡLn(fla)]与分子氧的反应产物与天然2,4-QD的反应产物一致,表明模型配合物具有与天然酶类似的反应活性.模型配合物与分子氧的反应速率常数k与E1/2(CuⅡ/Ⅰ)、Epa(fla-/fla·)及pKa分别呈良好的线性关系,说明结构-性质-O2反应性之间有一定的相关性,即配体的酸性越强,反应性越高. 相似文献
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