聚(4-乙烯基吡啶季铵盐-丙烯酰胺)的抗菌性能与机理研究

季铵盐型阳离子聚合物具有絮凝、缓蚀与杀菌等多种功能,据此,我们通过分子设计,先将丙烯酰胺与4-乙烯基吡啶（4-VP）进行共聚合,然后使用季铵化试剂硫酸二甲酯使共聚物阳离子化,制备了吡啶季铵盐型阳离子聚丙烯酰胺（QPAV）,本文报道QPAV的抗菌性能,并探讨其抗菌机理,结果表明,吡啶季铵盐型阳离子聚丙烯酰胺具有很强的抗菌性能,且其抗菌机理是基于杀菌而不仅仅是抑菌。     

季铵化聚乙烯亚胺的抗菌性能研究

采用叔胺化反应与季铵化反应两步高分子反应过程,制备了季铵化的聚乙烯亚胺(QPEI);以大肠杆菌(E.coli)为致病菌体,重点研究了高分子季铵盐QPEI的抗菌活性;采用平板活菌记数法考察了季铵化度及pH值等因素对其抗菌性能的影响规律;并采用β-半乳糖苷酶活性测定法,研究了QPEI的抗菌机理.研究结果表明,QPEI具有很强的抗菌能力,对浓度为109CFU/mL的菌悬液,在药剂量为15mg/L、接触时间为4min的条件下,杀菌率可达100%;QPEI的季铵化度对其抗菌性能影响很大,季铵化度越高,抗菌性能越好;在一定的pH值范围内,pH值越高,抗菌性能越好.β-半乳糖苷酶活性测定结果表明,QPEI的抗菌机理是基于杀菌过程,而不只是抑菌作用.     

有机高分子抗菌剂的制备及抗菌机理

综述了有机高分子抗菌剂的研究进展,分别对带有季铵盐、季鳞盐、有机锡、吡啶类、胍盐类、卤代胺类和壳聚糖衍生物类七种抗菌基团的有机高分子抗菌剂的合成及应用等方面作了评述.重点介绍了季铵盐与季鳞盐两种有机高分子抗菌剂的发展情况,对季铵盐和季鳞盐应用于抗菌剂领域的优劣进行了比较.介绍了近几年发展较快的几种有机高分子抗菌剂的制备...     

季铵盐、季膦盐类高分子抗菌剂的研究进展

综述了季铵盐、季膦盐类高分子抗菌剂的研究进展,包括该类抗菌剂的合成、性能及抗菌机理。现有的研究结果表明,含有多种杀菌基团高分子抗菌剂的抗菌作用可能与杀菌基团的种类、杀菌基团的固载量、载体与杀菌基的结合位置、杀菌基团的分布、载体的表面亲水性能、聚合物的交联度、链结构等有关。若能在分子结构中同时有序引入季铵盐或季膦盐、海因类杀菌基团,有可能存在杀菌基团的协同效应,并且可能形成一个新的高分子抗菌材料的研究分支。     

硅胶接枝新型长链季铵盐抗菌材料制备及其抗菌性能

硅胶接枝季铵盐;水不溶抗菌材料;聚乙烯亚胺;抗菌机理     

高分子季铵盐抗菌材料研究进展

近年来,随着人们生活水平和卫生意识的提高,新型抗菌材料的研究和开发逐渐受到学术界和工业界的重视。高分子抗菌材料由于其官能团密度高、抗菌作用时效长、毒性低、对人体刺激性小、同时还易于功能化修饰等特点,正成为当前科学研究和应用开发的一个热点,其中又以高分子季铵盐类抗菌材料研究较为广泛。本文按照季铵盐的结构特点分类,综述了近年来高分子季铵盐抗菌材料领域的相关研究和应用进展,并对这类材料的未来发展趋势和研究热点进行了展望。     

尾式卟啉-吡啶(三乙铵)季铵盐的合成

合成了10个尾式卟啉-吡啶(三乙铵)季铵盐化合物.它们的结构经元素分析、IR,1H NMR,MS和UV-Vis确证.     

具有荧光和抗菌双重功能的苦味酸吡啶季铵盐的制备综合实验

介绍了一项涉及苦味酸吡啶季铵盐制备与性能研究的综合性实验.以吡啶、苦味酸、4-溴苄基溴和碳酸钾等为原料,合成了苦味酸-4-溴苄基吡啶季铵盐([4BrBzPy][PIC]),利用红外光谱、紫外-可见光谱、电喷雾质谱、粉末X-射线衍射和单晶X-射线衍射技术进行了表征,并对其固态荧光和抗菌性能进行研究.该实验项目来源于科研,...     

取代苄基吡啶类季铵盐的制备及其杀菌活性

采用吡啶或2-氨基吡啶与取代苄基衍生物反应获得3种苄基吡啶类季铵盐．即：溴化苄基吡啶盐（[Bz—Py]Br）,溴化苄基-2-氨基吡啶盐（[Bz-2-NH2Py]Br）和溴化对硝基苄基吡啶盐（[NO2Bzpy]Br]）．通过元素分析,红外光谱和电子喷雾质谱等手段进行了组成分析和结构表征,并以绿脓杆菌和金葡萄球菌为致病菌体测定了3种盐的杀菌活性．实验结果表明,所制备的3种吡啶类季铵盐具有良好的杀菌性能．     

带有乙烯基苄基的长链季铵盐的合成及安全性研究

以对乙烯基苄基氯(C_9H_9Cl)为原料,与二甲基十六烷基胺(16DMA)合成新型季铵盐抗菌单体N,N-二甲基十四烷基对乙烯基苄基氯化铵(C_9H_9Cl-16DMA),并用FT IR、~1H NMR、EA、TG等手段表征其结构;采用抑菌圈法测试季铵盐单体对大肠杆菌、金黄色葡萄球菌和枯草芽孢杆菌的抑菌活性。通过家兔的生理特征测试、急性皮肤刺激性实验和小鼠经口毒性实验表征了该季铵盐单体对人体的安全性,毒理实验结果显示,家兔生理特征无异样变化;家兔的皮肤没有任何变化,根据寇氏法公式求出单体对小鼠的7d的LD_(50)及其95%可信限范围为3000.68(2560.57~3440.79)mg/kg。     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.     

Facile synthesis of bicyclic 1-arylpyrazol-5-ones

In this Letter, we described a facile method for constructing fused bicyclic 1-arylpyrazol-5-one ring system. We employed various methylene-containing carboxylic acids as the substrates and proved that the pyrazolone ring closure requires activated methylene group in intermediate II. Accordingly, a series of structurally diversified, fused bicyclic 1-arylpyrazol-5-ones was prepared in moderate to high yields using the requisite substrates.     

Synthesis of pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles by Curtius reaction in Morita-Baylis-Hillman derivatives

Synthesis of substituted pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles from the Morita-Baylis-Hillman derivatives of acrylates via saponification followed by Curtius reaction is described.     

正丁胺对激光染料荧光谱影响的研究

用正丁胺作为碳源,采用射频辉光放电制备碳膜,选用激光染料R6G和聚乙二醇混合液作为蒸气源,采用单源热蒸发,在蒸发室与染料同时沉积得到混合膜,用拉曼光谱和红外光谱分析了碳膜的结构和键合方式,分析表明:碳膜中存在胺基团和氢原子.混合膜的荧光谱测量结果表明,认为正丁胺对染料荧光谱的影响是因为胺基和氢原子的存在.     

Cu0-catalysed 1,3-dipolar cycloadditions of α-amino acid derived N,N-cyclic azomethine imines to ynones

A series of 20 CuAIAC reactions between eight 4-acylamino substituted pyrazolidine-3-one-1-azomethine imines and four terminal ynones were performed using Cu⁰ as catalyst. The corresponding fluorescent cycloadducts were obtained in very high yields upon simple workup. Thus, Cu-metal turned out to be a better catalyst than Cu^I in terms of yield and ease of isolation. Availability of azomethine imines, mild reaction conditions, and simple workup enable a “click” access to libraries of densely substituted 2,3-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-ones. Reactivity of differently substituted dipoles was evaluated experimentally and by quantum chemical methods (DFT).     

Synthesis and antioxidative/anti-inflammatory activity of novel fullerene–polyamine conjugates

(E)-4-(Fullerenopyrrolidin-1-yl)-3-methylbut-2-enoic acid and its corresponding succinimidyl ester, readily obtained through Prato-type modification of C₆₀, were used for the selective N-acylation of polyamines. The thus obtained conjugates were evaluated for their antioxidative and anti-inflammatory activity and their cytotoxicity was determined. Members of this family of compounds showed interesting anti-lipid peroxidation, anti-lipoxygenase and anti-inflammatory activity and comparable cytocompatibility to spermidine.