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离子液体作为酶催化反应的介质正越来越多的受到关注,因为与传统有机溶剂和水相比,酶在离子液体中表现出了更好的活性、热稳定性、立体选择性、对映体选择性和可循环性。本文综述了近几年来脂肪酶、氧化还原酶、蛋白酶在离子液体中的催化反应。 相似文献
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功能化的离子液体在电化学中的应用 总被引:11,自引:0,他引:11
离子液体独特的全离子结构无疑会导致良好的导电性,成为有潜力的绿色电化学材料。功能化是实现离子液体专一性的重要手段。本文综述了近几年功能化的离子液体在电化学研究中的进展,内容包括阴离子功能化、阳离子功能化和离子液体固相化。作者还对离子液体结构与离子电导率、电势窗口、稳定性和溶解能力的关系提出了一些看法。 相似文献
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Ftima A. R. Mota Sarah A. P. Pereira Andr R. T. S. Araujo M. Lúcia M. F. S. Saraiva 《Molecules (Basel, Switzerland)》2021,26(1)
Human neutrophil elastase (HNE) is used as diagnostic biomarker for inflammation/infection. In this work, 10 ionic liquids (ILs) and 11 ionic liquids active pharmaceutical ingredients (ILs-APIs) were tested to evaluate the inhibition effect on the activity of porcine pancreatic elastase enzyme, frequently employed as a model for HNE. The insertion of ionic liquids in some drugs is useful, as the insertion of ILs with inhibitory capacity will also slow down all processes in which this enzyme is involved. Therefore, a spectrophotometric method was performed to the determination of EC50 values of the compounds tested. EC50 values of 124 ± 4 mM to 289 ± 11 mM were obtained, with the most toxic IL for elastase being tetrabutylammonium acetate and the least toxic 1-butyl-3-methylimidazolium acetate. Moreover, sodium salicylate (raw material) presented the lower and benzethonium bistriflimide the higher EC50 when compared with all the IL-APIs tested. This work provides significant information about the effect of the studied IL and IL-APIs in elastase enzyme activity. 相似文献
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Ionic liquids (ILs) have been extensively used in drug formulation and delivery as designer solvents and other components because of their inherent tunability and useful physicochemical and biopharmaceutical properties. ILs can be used to manage some of the operational and functional challenges of drug delivery, including drug solubility, permeability, formulation instability, and in vivo systemic toxicity, that are associated with conventional organic solvents/agents. Furthermore, ILs have been recognized as potential solvents to address the polymorphism, limited solubility, poor permeability, instability, and low bioavailability of crystalline drugs. In this account, we discuss the technological progress and strategies toward designing biocompatible ILs and explore potential biomedical applications, namely the solubilization of small and macromolecular drugs, the creation of active pharmaceutical ingredients, and the delivery of pharmaceuticals. 相似文献
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Iveta Kmentová Battsengel Gotov Vladimír Gajda Štefan Toma 《Monatshefte für Chemie / Chemical Monthly》2003,134(4):545-549
Summary. The Sonogashira reaction of iodobenzene with phenylacetylene in several room temperature ionic liquids was studied. A regeneration of the
catalytical system immobilized in 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim]PF6) has been also investigated. The reactivity of different iodoarenes with terminal alkynes in [bmim]PF6 was studied as well.
Corresponding author. E-mail: toma@fns.uniba.sk
Received September 2, 2002; accepted September 9, 2002 相似文献
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Dr. Peter Nockemann 《无机化学与普通化学杂志》2012,638(10):1548-1548
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Cinzia Chiappe 《Monatshefte für Chemie / Chemical Monthly》2007,138(11):1035-1043
Summary. From an overview of the different theoretical and experimental methods it was possible to evidence the presence of aggregates
in ionic liquids (ILs), and to specify their role in determining the unique physical-chemical properties of these media. An
understanding of the structure of ILs, as pure compounds or in the presence of dissolved species, is fundamental if the reactivity
and selectivity in ILs mediated reactions is to become predictive. 相似文献
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近年来人们对离子液体的兴趣不断增长。室温离子液体是一类熔点在室温附近的熔融盐,以其显著的特性在电化学、有机合成、催化、分离等领域被广泛应用。离子液体与氟化学紧密相关,离子液体中含有多种氟阴离子的烷基铵盐、咪唑盐等的合成、性质以及应用已经得到研究。离子液体的阴阳离子中氟原子数量和位置的不同,使离子液体具有不同的性质,如耐水性、耐温性、粘度、密度、表面张力、液体范围、导电性等。含氟的离子液体是离子液体的主要品种,它们凭借良好的可设计性和绿色环保的特点在当今化工工程的绿色化进程中显示出巨大的潜力和广阔的应用前景。 相似文献
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Improving the Enzyme Catalytic Efficiency Using Ionic Liquids with Kosmotropic Anions 总被引:1,自引:0,他引:1
The kosmotropicity of cations and anions in ionic liquids has a strong influence on the enzyme catalytic efficiency in aqueous environments. The kosmotropic anion CF3COO^- seemed to activate the protease, and the chaotropic anions tended to destabilize the enzyme. 相似文献
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离子液体对某些无机和有机物溶解性能好、液态温度和电化学窗口范围宽、热稳定性高、易制备,因而近年来成为国内外研究的热点,目前的离子液体大多由烷基吡啶或双烷基咪唑季铵盐阳离子与氯铝酸根、氟硼酸根、六氟磷酸根以及其它大的阴离子构成,在季铵盐类离子液体中, 相似文献
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超临界CO2/离子液体体系 总被引:2,自引:0,他引:2
超临界CO2和离子液体是两种具有优异性能的绿色化学试剂,本文介绍了将两者结合反应,分离体系的物化性质和多种绿色化学过程。利用超临界CO2可以广泛地萃取离子液体中的不挥发性化合物而不导致离子液体及其中催化剂的流失,在加氢、醛化、甲酰化等反应,分离过程中的应用表明,过程具有很好的反应分离特性和环境友好性,应用前景广阔。 相似文献
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离子液体独特的物理化学性质,使其成为应用前景良好的绿色功能材料和介质,受到广泛关注。本文探讨了离子液体结构-性质关系及现存的问题,对相关实验和理论工作进行了分析;揭示了离子液体的多尺度结构和动态变化规律,构建离子液体微观结构与宏观性质之间的定量关系,为离子液体体系定量设计与调控提供了科学理论和方法;展望了离子液体在化工、能源、环境和材料等领域的应用。 相似文献
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纤维素是一种可生物降解的天然高分子材料,由于纤维素含有大量的分子间和分子内氢键,导致纤维素难溶于水和一般的有机溶剂。现有的溶剂存在稳定性差、具有毒性、难以回收等缺点,对纤维素的加工、利用造成困难,因此,寻找新型绿色溶剂成为纤维素开发的热点和难点。离子液体是一种新型高效绿色溶剂,在一定条件下可以溶解纤维素、角蛋白等生物大分子,离子液体的出现为纤维素的溶解提供了一种环境友好、可生物降解的溶剂体系,具有广阔的应用前景。本文就不同种类离子液体溶解纤维素的溶解度以及影响溶解度的几种因素进行了综述,总结了离子液体与纤维素作用机理以及离子液体的回收方法,为纤维素的加工利用提供了理论依据和工业指导。 相似文献
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应用线性扫描循环伏安法、方波循环伏安法和计时电量法测定苯甲醛在3种离子液体C4M IMBF4、C6M IMBF4和C8M IMBF4中的电化学行为.实验表明,在C4M IIVIBF4离子液体中苯甲醛于GC电极上的还原包含两个连续、不可逆单电子过程,对应的方波I~E曲线峰电位Ep为-1.39 V和-1.69 V,估算的扩散系数分别为D1=1.5×10-8cm2/s和D2=1.3×10-8cm2/s.而在C6M IMBF4和C8M IMBF4离子液体中,则苯甲醛于GC电极仅显示一个电流峰,这可能是因为C4M IMBF4的碱性较C6M IMBF4和C8M IMBF4弱的缘故;而电流的衰减时间亦依C4M IMBF4,C6M IMBF4,C8M IMBF4,次序增长,并会导致更慢的异相动力学过程. 相似文献