Surface-Active Ionic Liquid Cholinium Dodecylbenzenesulfonate: Self-Assembling Behavior and Interaction with Cellulase
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The conventional sodium dodecylbenzenesulfonate (NaDBS) has been converted into an efficient and nontoxic anionic surface-active ionic liquid, cholinium dodecylbenzenesulfonate (Cho[DBS]). We have investigated its self-assembling behavior, interaction with the enzyme cellulase, and ecotoxicity. The surface-active properties at the air-liquid interface and the aggregation behavior of Cho[DBS] in water have been determined using tensiometry, isothermal titration calorimetry (ITC), conductometry, and dynamic light scattering (DLS). The enzyme activity was observed using dinitro salicylic acid analysis. The enhanced enzyme activity was explained through active-site exfoliation and structural constancy of cellulase in the micellar medium using the results from fluorescence, circular dichroism, DLS, and ITC. The nontoxic nature was confirmed by toxicity analysis on the freshwater microalgae Scenedesmus sp.Keywords:
Sodium dodecylbenzenesulfonate
Isothermal Titration Calorimetry
Conductometry
Activity of endoglucanase,exoglucanase,cellobiase and filter paper enzyme of four kinds of commercial cellulases were evaluated.Sources of cellulases were mixed,and enzyme activities of these mixtures were then determined.The impact of surfactants on the enzyme activity was studied as well.Results showed that cellobiase was the key factor to the total complex cellulase system.Additionally, the endoglucanases,exoglucanases and cellobiases from different complex cellulase systems were able to act as isoenzymes.The effect of surfactant on the cellulase activity varied with the concentration of the surfactant.Surfactant Tween 80 was added to two of the mixed cellulases in a concentration of 0.01%,which increased the cellulase activity and hastened the degradation of cellulose.
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Poly(3,4-ethylenedioxythiophene) nanoparticles with narrow size distribution were prepared in organic dispersant media in the presence of both iron(III) dodecylbenzenesulfonate {Fe(DBS)3}-acting as both an oxidant and a stabilizer-and ω-functionalized polyisoprenes (ω-R-PI) as costabilizers. The effects of the solvent nature and concentration of Fe(DBS)3 on the size and morphology of the PEDOT particles were first studied in the absence of costabilizer. Second, the effects of the molar mass, concentration, and nature of the functional end group of the polyisoprene costabilizer were investigated. PEDOT nano-objects were characterized by transmission electron microscopy (TEM), atomic force microscopy (AFM), dynamic light scattering (DLS), and conductivity measurements.
Sodium dodecylbenzenesulfonate
Stabilizer (aeronautics)
Dispersity
Molar mass
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Cellulase is a kind of enzyme which can decompound fiber into glucose.One of the best ways to deal with fiber offal is use cellulase. This paper summarise the structue of cellulase,the degradation mechanism,the extraction and application of cellulase.Besides,we also do some expectation about the development of cellulase.
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Through the practice of cellulase treatment technology,the main elements influencing the effect of cellulase treatment on cotton knitted fabric were discussed.Research on influencing the effect of cellulase degrading cellulose was made through some specific elements such as temperature,PH value,enzyme processing time,inhibitors and activators,cellulase dosage,different cellulases,different fabric pretreatment conditions and enzyme treatment equipments and some points for attention were put forward.
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Adding some auxiliaries to the cellulase solution, the cellulase activity was detected by CMC method and filter paper method. Therefore the effects of auxiliaries on cellulase activity can be analyzed. The cellulase promoters are obtained and the optimized compound cellulase preparation for textile finishing is defined.
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The amount of sodium dodecylbenzenesulfonate remained on the rinsed tableware and vegetable has been determined by radio tracer technique using labeled dodecylbenzenesulfonate 35S. If tableware rinsed, for example, two seconds with fresh water right after it was washed in 0.157% aqueous solution of sodium dodecylbenzenesulfonate, 3.9×10-6, 2.2×10-5, 1.1×10-5 and 4.7×10-5mg/cmcm2 of dodecylbenzenesulfonate remained on the porcelain, plastic, glass and stainless surface, respectively. If, for example, cabbage was rinsed for about five seconds to one minute in the trough supplying fresh water right after five minutes washing in 0.05% aqueous solution of dodecylbenzenesulfonate, 0.1-0.2mg of dodecylbenzenesulfonate remained in hundred grams of cabbage.The effects of detergent concentration, washing and rinsing periods, etc., on the amount of sodium dodecylbenzenesulfonate remained on the vegetable and tableware were also examined.
Sodium dodecylbenzenesulfonate
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Isothermal Titration Calorimetry
Conductometry
Characterization
Isothermal process
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Isothermal Titration Calorimetry
Exothermic reaction
Isothermal process
Static light scattering
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Sodium dodecylbenzenesulfonate
Surface Modification
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Sodium dodecylbenzenesulfonate
Conductometry
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