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Ali Asghar Rastegari Abdol-Khalegh Bordbar Vajihe Mehnati-Najafabadi 《Cellulose (London, England)》2010,17(6):1213-1225
The present study evaluates the binding of cetylpyridinium chloride (CPC) with cellulase in various experimental conditions
using potentiometric, fluorescence spectroscopy and turbidimetric techniques. The analysis of binding curves revealed the
existence of two sets of binding sets for CPC. The binding parameters were estimated and interpreted in terms of structural
viewpoints of cellulase. The observation of turbidity suggests that CPC molecules individually nucleate around cellulase/CMC
complex to form micelle-like structures. Fluorescence spectroscopy analysis of cellulase/CMC-surfactant system showed that
these complexes could be compact to elucidate the mechanism of binding cellulase/CMC complex to CPC. The differential response
of the enzyme/CMC to surfactant, indicates that the interaction on the complex surface is strongly ionic and hydrophobic(cooperative)
in nature. A sequencing analysis was also conducted on β-1, 4-endoglucanase from A. niger (EglA) and others from family 12 in order to examine the nature of interaction involved in binding process and structure
of carbohydrate-protein complexes. The results suggest that the conserved residues are located in a more hydrophobic microenvironment
and apolar area energy is more than polar within enzyme structure. 相似文献
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Copper@PMO nanocomposites as a novel reusable heterogeneous catalyst for microwave‐assisted green synthesis of β‐hydroxy‐1,2,3‐triazoles through experimental design protocol
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A microwave‐assisted multicomponent reaction was used to prepare a series of β‐hydroxy‐1,2,3‐triazoles in the presence of copper@PMO nanocomposites as a catalyst. Box–Behnken design and response surface methodology were used to optimize the influencing parameters such as catalyst content, reaction time and microwave power, being an economical way of obtaining the optimal reaction conditions based on restricted number of experiments. Aqueous reaction medium, easy recovery of catalyst, efficient recycling and high stability of the catalyst render the protocol sustainable and economic. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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In this study, library substituted benzodiazepines was synthesized using molecular ionic liquid supported on Fe‐MCM‐41 nanocomposites (Fe‐MCM‐41‐IL). This protocol using ultrasound provided advantages such as rapid, clean conversion and simplicity in experimental setup that led to rapid generation of benzodiazepines under mild condition. The catalyst can be easily isolated by using an external magnetic field and reused in the next reaction up to six cycles without obvious activity decreasing. 相似文献
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V. Nejadshafiee M. Abaszadeh K. Saidi M. Pourkhosravani 《Journal of the Iranian Chemical Society》2013,10(2):237-241
Readily available (chlorocarbonyl)phenyl ketene and a varied set of β-ketoamides were reacted in a one-step procedure to produce 2-pyrone derivatives. β-Ketoamide derivatives are versatile intermediates for the synthesis of heterocyclic compounds. For instance, 1-morpholino-3-phenyl-1,3-propanedione, 1-phenyl-3-piperidino-1,3-propanedione, 1-phenyl-3-pyrrolidino-1,3-propanedione, 1-piperidino-1,3-butanedione, 1-morpholino-2-phenyl ethanone were used in these reactions to produce 2-pyrone derivatives. In addition, the preparation of 4-hydroxy-3-phenylthiochromeno[4,3-b]pyran-2,5-dione derivatives and 4-hydroxy-7-methyl-3-phenyl pyrano[3,2-c]chromeno-2,5-dione were described. For the synthesis of these compounds 4-hydroxy-2H-thiochromen-2-ones and 4-hydroxy-8-methyl-2H-chromen-2-one were reacted with (chlorocarbonyl)phenyl ketene and the final products were isolated in good yields. 相似文献
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