Dodecyl Glucoside Research Articles

Preparation of an environment-friendly microbial limestone dust suppressant and its dust suppression mechanism.

The development of an efficient and environmentally friendly dust suppressant is crucial to address the issue of dust pollution in limestone mines. Leveraging the synergistic microbial-induced calcium carbonate precipitation (MICP) technology involving NaHCO3 and dodecyl glucoside (APG), the optimal ratio of the dust suppressant was determined through single-factor and response surface tests. The dust suppression efficacy and mechanisms were analyzed through performance testing and microscopic imaging techniques, indicating that the optimal ratio of the new microbial dust suppressant was 20% mineralized bacteria cultured for 72h, 0.647molL-1 cementing solution, 3.142% NaHCO3, and 0.149% APG. Under these conditions, the yield of calcium carbonate increased by 24.89% as compared to when no NaHCO3 was added. The dust suppressant demonstrated excellent wind, moisture, and rain resistance, as well as curing ability. More calcite was formed in the dust samples after treatment, and the stable form of the dust suppressant contributed to consolidating the limestone dust into a cohesive mass. These findings indicate that the synergistic effect of NaHCO3 and APG significantly enhanced the dust suppression capabilities of the designed microbial dust suppressant.

Influencing effects of different types of dispersants on the permeability levels of Coal-Bearing propped fractures in coalbed methane reservoirs

This study investigated how to effectively discharge deposited pulverized coal particles in coal-bearing propped fractures and improve the permeability levels of the propped fractures in order to enhance coalbed methane production. Four types of dispersants were selected to carry out wettability and permeability tests, including sodium dodecyl sulfate (SDS), sodium dodecyl benzene sulfonate (SDBS), dodecyl dimethyl betaine (BS-12), and alkyl poly glycoside dodecyl glucoside (APG). The results showed reductions in surface tension of 63.71 to 69.75 %, and reductions in contact angles of 40.08 to 60.46 %, when compared with water injections alone. In addition, under the same closure pressure conditions, the dispersant solutions had increased the permeability of the propped fractures by 76.67 to 123.34 % when compared with that of the water injections, and the pulverized coal discharge rates were increased by 1.44 to 2.41 times. The decreases in closure stress also contributed to the enhancement of the permeability of the propped fractures, with increases of between 11.24 and 29.18 % observed. This study found that for the four tested dispersants, the order of the effective wetting of the pulverized coal particles and enhancement of the permeability of the propped fractures were (from strong to weak) as follows: SDS > BS-12 > APG > SDBS. Among the tested dispersants, the 6 mmol/L SDS dispersant solution was found to be the most effective for improving the wettability of the pulverized coal particle surfaces and achieved the highest permeability improvement of the propped fractures.

Study on the effects of surfactants on the interface characteristics and wettability of lignite

To further explore the wetting mechanism of the interface between surfactant and coal dust. By constructing a surfactant-water-coal interfacial simulation system, the microscopic interfacial wettability of four surfactants, rapid penetrant T (RPT), sodium dodecylbenzene sulfonate (SDBS), dodecyl glucoside (APG), and cocamidopropyl betaine (CAB), on coal dust is discussed. The intermolecular movement trends were observed to determine the correlation mechanism of surfactants affecting the wettability of coal dust. The results showed that the total pore volume and specific surface area after wetting coal dust in the RPT system decreased by 90.53% and 96.93%, respectively, with a median particle size distribution up to 151.29 μm; the interfacial thickness, tension and interfacial formation energy were 27.08 Å, 31.66 mN/m and − 80.91 kcal/mol, respectively, compared with SDBS, APG and CAB, corresponding to The maximum improvements were 13.40%, 6.85%, and 59.04%, respectively, which were closely related to the strength and types of interactions between different surfactants and molecules, i.e., the adsorption strength of electrostatic interactions such as hydrogen bonding was greater than van der Waals interactions, and the macroscopic experiments were consistent with molecular interface simulations, and the research results could provide a reference for efficient evaluation of the wettability of surfactants.

Synthesis and characterisation of a novel pH-sensitive flocculant and its flocculation performance

In this study, a novel pH-sensitive flocculant, poly(AM-DEA-DPL) (PADD), was synthesised using acrylamide (AM), diethylaminoethyl methacrylate (DEA), and dodecyl glucoside (DPL) as monomers through solution copolymerisation. The synthesis conditions were optimised, and the intrinsic viscosity and conversion rate of the polymer were improved. The molecular structure of the flocculant was determined through Fourier transform infrared (FTIR) spectroscopy and proton nuclear magnetic resonance (1H NMR) spectroscopy analysis. The isoelectric points of PADD were found to be pH 4 through zeta potential measurements, indicating that PADD is an amphoteric flocculant. The change in turbidity with pH reflected the pH sensitivity and the change in the hydrophilicity and hydrophobicity of the polymer. Gel permeation chromatography (GPC) measurements showed that the average molecular weight of the polymer was 89,310. PADD had great turbidity removal and flocculation effects on both hydrophilic kaolin and hydrophobic molybdenite. At pH 2–8, a small amount of flocculant had excellent flocculation effects on kaolin and molybdenite suspensions. According to FTIR characterisation and zeta potential measurements of the flocs, and to previous reports, this was mainly the result of electrostatic attraction, adsorption bridging, hydrophobic association, and synergy. The PADD flocculant has promising industrial applications.

Studying on the properties of Mixed Surfactant Systems

The Anionic-nonionic Gemini Surfactant oxalamide polyoxyethylene lauryl ether (7) succinate sodium sulfonate (OPLES-7) was synthesized. It was mixed with the dodecyl glucoside in different ratios to enhance application performance. The mixed critical micelle concentration (CMC) of the binary surfactant systems was determined by surface tension measurement. Critical micelle concentration of mixed system is 0.141mmol ⋅ L−1 when the molar fraction of OPLES-7 to dodecyl glucoside 1:1. The influence of NaCl on surface properties of the mixed system was also studied. The surface activity was enhanced with the increase of NaCl concentration.

Toward Milder Personal Care Cleansing Products: Fast ex vivo Screening of Irritating Effects of Surfactants on Skin Using Raman Microscopy

Abstract We report a novel Raman technique that allows fast and reliable ex vivo assessment of the irritability of personal care cleansing products to the skin in terms of the molecular-level effects such as retention of water by corneocytes, change in the packing order and content of intercellular lipids, and the structure of keratin. We test this technique for the single surfactants (dodecyl glucoside, sodium dodecyl sulfate, sodium cocoyl glycinate, lauramidopropyl betaine) that are typically used in personal care, as well as on three types of commercial soap bars (“superfat”, “syndet”, and “combar”). We find that soaking of the skin for prolonged time in pure water can cause unfolding of keratin, which is commonly considered as a signature of “harshness” when dealing with the surfactant formulations. Moreover, molecular-level signatures of irritability of the test surfactants and soaps at brief (10 min) exposure times do not follow the trend expected from their critical micelle concentrations (CMC) and collagen swelling. In particular, dodecyl glucoside has positive impact on the barrier properties of the stratum corneum (SC) and apparent detergency properties (solubilizes lipids without affecting their packing order). We also find that two qualitatively different soap bars (“superfat” and “syndet”) are similarly mild under the conditions studied, while the “combar” soap has detergency properties. These results demonstrate that to improve methodology of predicting irritability of a surfactant-based formulation, we need to study more systematically the molecular-level responses of the SC to exposure.

Antibacterial action of functional silicon dioxide: an investigation of the attachment and separation of bacteria

ABSTRACTBactericidal proteins from the Moringa oleifera seed are reported to be suitable alternatives to conventional methods of bacterial reduction in water. In this study the cationic bactericidal M. oleifera proteins were isolated by attachment onto the surface of silicon dioxide. This functionalised SiO2(ƒ-SiO2) was then exposed to Escherichia coli and Micrococcus luteus to examine whether the ƒ-SiO2 could be used to inactivate the bacteria. The effect of the non-ionic surfactant dodecyl glucoside on the attachment of these bacteria to the ƒ-SiO2 was examined with the aim of developing a method of reusable bacterial inactivation. The primary result of this study was that the E. coli could be readily separated from the ƒ-SiO2, allowing the ƒ-SiO2 to be used for further bacterial inactivation. The regeneration of the ƒ-SiO2 was demonstrated using fluorescence microscopy on bacterial cells stained with propidium iodide, and zeta potential measurements. Future applications of this work include a reusable method of removing bacteria from contaminated water.

Moringa oleifera functionalised sand - reuse with non-ionic surfactant dodecyl glucoside.

Moringa oleifera seeds are well known for their ability to cause flocculation in turbid water and facilitate bacterial inhibition. These effects are due to the cationic polypeptide MO2.1, which affects the surface charge of suspended particles and causes lysis of bacterial cells. However, the attachment of bacteria to MO2.1 prevents further bacterial attachment, reducing the effectiveness of the seeds. This research investigated the effect of surfactants on functionality and reuse of Moringa seeds to develop a sustainable water treatment technique. The seed extracts (MO2.1) were used with a functionalised sand system, and the sands were exposed to commercially available (ionic and non-ionic) surfactants, dodecyl glucoside and sodium dodecyl sulfate. Artificially polluted water contaminated with Escherichia coli was used to evaluate the efficiency of the system. The non-ionic surfactant was found to be effective at separating E. coli from the functionalised sand without the detachment of the MO2.1 and subsequent loss of the system efficiency. This was successfully repeated four times. The results demonstrated a sustainable, reusable technique to inhibit bacterial contamination in water.

Formation and Solubilization Property of Water-in-Oil Microemulsions of Alkyl Glucosides

The dependence of solubilization properties on the alkyl chain length of alkyl glucosides (AG) in AG/isooctane/ n-butanol/water system was investigated. The stable Winsor II system consisting of a water-in-oil (w/o) microemulsion phase and an aqueous phase was formed in AG/isooctane/n-butanol/water system. The apparent critical micelle concentration of AG reverse micelles in organic phases was markedly dependent upon the alkyl chain length of AG. The limiting amount of solubilized water increased with an increase in the alkyl chain length of AG. The solubilization capacity of methyl orange (MO) was superior to that of methylene blue (MB), and the solubilization capacities of MO and MB tended to increase with increasing the alkyl chain length of AG. Reverse micelles of dodecyl glucoside (AG12) exhibited the significant solubilization capacities of cytochrome c and lysozyme, while ribonuclease A was not solubilized by AG12 reverse micelles.

Extraction of water miscible organic dyes by reverse micelles of alkyl glucosides

The extraction of methyl orange or methylene blue from an aqueous phase to an organic phase of reverse micelles of alkyl glucosides was investigated. Dodecyl glucoside, a biodegradable and biocompatible surfactant, was employed as a kind of alkyl glucosides, since a stable Winsor II system consisting of the water-in-oil type microemulsion and aqueous phases was formed when an organic solution containing dodecyl glucoside was contacted with an aqueous solution. The water content in the reverse micellar organic phase increased with an increase in the concentration of dodecyl glucoside. The extraction ratio of dyes also increased with increasing the concentration of dodecyl glucoside. Furthermore, the extraction ratio of dyes was dramatically dependent upon the pH of an aqueous phase and temperature.

Dodecyl maltoside as a solubilizing agent of stratum corneum lipid liposomes

The lytic interactions of the nonionic surfactant dodecyl maltoside (DM) with liposomes formed by a mixture of lipids modeling the stratum corneum (SC) lipid composition were investigated. To this end, the surfactant to lipid molar ratios (Re) and the normalized bilayer/aqueous phase partition coefficients (K) were determined by monitoring the changes in the static light-scattering (SLS) of the system during solubilization. The fact that the free surfactant concentration was always similar to its critical micelle concentration indicates that the liposome solubilization was mainly ruled by formation of mixed micelles. In addition, the linear dependence established between the level of SLS and Re indicates a progressive incorporation of DM in the liposomes as well as the progressive formation of mixed micelles. DM showed in all cases lower bilayer activity (higher Re values) and greater affinity with vesicles (higher K values) than those reported for its interaction with phosphatidylcholine (PC) liposomes. Thus, whereas the SC lipid liposomes were more resistant to the action of this surfactant, its degree of partitioning into SC bilayers was higher throughout the solubilization process than that exhibited in PC vesicles. Comparison of the present Re values with those reported for the lytic interaction of dodecyl glucoside (DG) with SC liposomes reveals that in the case of DM the bilayer activity was more than three times higher than that for DG in spite of the identical alkyl chain length.

Influence of the alkyl chain length of alkyl glucosides on their ability to solubilize phosphatidylcholine liposomes

The solubilizing alterations caused by a series of alkyl glucosides (alkyl chain length ranging from C 8 to C 12) in neutral and electrically charged phosphatidylcholine (PC) liposomes were investigated. The surfactant to phospholipid molar ratios (Re) and the bilayer/aqueous phase partition coefficients ( K) were determined by monitoring the changes in the static light scattering (SLS) of the system during solubilization. Liposomes were formed by PC, to which phosphatidic acid (PA) or stearylamine (SA) was added when required to increase the negative or positive surface charge. The fact that at the two interaction levels investigated (100 and 0% of SLS of the surfactant/PC systems), the free surfactant concentration for each surfactant was always comparable to its critical micelle concentration (CMC) indicates that the liposome solubilization was mainly ruled by the formation of mixed micelles. The rise in the surfactant CMC (decrease in its alkyl chain length) led to an increase in the surfactant ability to saturate or solubilize liposomes and inversely in an abrupt decrease in its bilayer affinity, regardless of the electrical charge of liposomes. The overall balance of these opposite tendencies shows that the octyl glucoside showed the highest ability to saturate and solubilize liposomes (lowest Re values), whereas the dodecyl glucoside exhibited the highest degree of partitioning into liposomes or affinity with these bilayer structures (highest K values). The use of C 9-Glu reduced approximately 2.5 times the concentration needed to saturate and solubilize 1.0 mM PC liposomes with respect to that needed for C 8-Glu, regardless of the type of electrical charge present in bilayers.

Influence of the hydrophobic tail of alkyl glucosides on their ability to solubilize stratum corneum lipid liposomes

The lytic interactions of a series of alkyl glucosides (alkyl chain lengths ranging from C8 to C12) with liposomes formed by a mixture of lipids modeling the stratum corneum (SC) lipid composition were investigated. The surfactant-to-lipid molar ratios (Re) and the normalized bilayer/aqueous phase partition coefficients (K) were determined by monitoring the changes in the static light-scattering (SLS) of the system during solubilization. The fact that the free surfactant concentrations were always similar to their critical micelle concentrations indicates that the liposome solubilization was mainly ruled by the formation of mixed micelles. At the two interaction levels studied (100 and 0% SLS) the nonyl glucoside showed the highest ability to saturate and to solubilize liposomes (lowest Re values), whereas the dodecyl glucoside showed the highest degree of partitioning into liposomes or affinity with these structures (highest K values). Comparison of the data for octyl glucoside with that reported for the interaction of this surfactant with phosphatidylcholine (PC) liposomes shows that whereas the SC lipid liposomes were more resistant to the action of this surfactant (higher Re values), its degree of partitioning into SC bilayers was both in the saturation and solubilization of liposomes similar to that exhibited in PC vesicles (similar K values).

Sublytic alterations caused by alkyl glucosides in stratum corneum lipid liposomes

The sublytic interactions of a series of alkyl glucosides (alkyl chain lengths ranging from C 8 to C 12) with liposomes formed by a mixture of lipids modeling the stratum corneum (SC) lipid composition were investigated. The surfactant to lipid molar ratios ( R e) and the normalized bilayer/aqueous phase partition coefficients ( K) were determined by monitoring the increase in the fluorescence intensity of liposomes due to the 5(6)-carboxyfluorescein (CF) released from the interior of vesicles to the bulk aqueous phase. Given that the free surfactant concentrations were always lower than their critical micelle concentrations (CMC) we may assume that the surfactant–liposome interactions were mainly ruled by the action of surfactant monomers. At the two interaction levels studied (50 and 100% CF release) the nonyl and the octyl glucoside showed respectively the highest ability to alter the liposome permeability (lowest R e values), whereas the dodecyl glucoside showed the highest degree of partitioning into liposomes or affinity with these structures (highest K values). Different trends in the interaction of these surfactants with SC and PC liposomes were detected when comparing the present R e and K values with those reported for PC vesicles. Thus, whereas SC lipid liposomes were more resistant to the action of alkyl glucosides (higher R e values), the degree of partitioning of these surfactants into SC bilayers was always greater than that exhibited for PC vesicles (higher K values).

Solubilization of phosphatidylcholine unilamellar liposomes caused by alkyl glucosides

AbstractSolubilizing alterations caused by a series of alkyl glucosides (alkyl chain lengths ranging from C8 to C12) in phosphatidylcholine (PC) unilamellar liposomes were investigated. Surfactant‐to‐phospholipid molar ratios (Re) and bilayer/aqueous phase partition coefficients (K) were determined by monitoring changes in static light scattering (SLS) of the system during solubilization. At the two interaction levels investigated (surfactant concentrations producing SLS values of 100 and 0% for each surfactant/PC system studied) the free surfactant concentration for each surfactant was always comparable to its critical micelle concentration (CMC). This indicates that liposome solubilization was mainly ruled by mixed micelle formation. A rise in CMC (or decrease in the surfactant alkyl chain length) resulted in an increase in the ability of these surfactants to saturate or solubilize PC liposomes and, inversely, in an abrupt decrease in their affinity with these bilayer structures. The overall balance of these opposite tendencies shows that the octyl glucoside had the highest ability to saturate and solubilize liposomes (lowest Re values), whereas the dodecyl glucoside exhibited the highest degree of partitioning into liposomes or affinity with bilayer structures (highest K values). From a practical viewpoint, the use of nonyl glucoside reduced approximately 2.5 times the concentration needed to saturate and solubilize 1.0 mM PC liposomes with respect to that needed using the conventional octyl glucoside.

Subsolubilizing alterations caused by alkyl glucosides in phosphatidylcholine liposomes

The subsolubilizing alterations caused by a series of alkyl glucosides (alkyl chain lengths ranging from C 8 to C 12) in unilamellar phosphatidylcholine (PC) liposomes were investigated. The surfactant to phospholipid molar ratios ( R e) and the normalized bilayer/aqueous phase partition coefficients ( K) were determined by monitoring the increase in the fluorescence intensity of liposome suspensions due to the 5(6)-carboxyfluorescein (CF) released from the interior of vesicles to the bulk aqueous phase. Given that the free surfactant concentrations was always lower than the critical micelle concentration (CMC) of the surfactant tested we may assume that the surfactant–liposome interactions were mainly ruled by the action of surfactant monomers. In general terms, the decrease in the surfactant alkyl chain length (or the rise in the surfactant CMC) resulted in an increase in the ability of these surfactants to alter the permeability of liposomes and, inversely, in an abrupt decrease in their affinity with these bilayers structures. The overall balance of these opposite tendencies shows that at the two interaction levels studied (50 and 100% of CF release) the nonyl and the octyl glucoside showed, respectively, the highest ability to alter the release of the CF trapped in bilayers (lowest R e values), whereas the dodecyl glucoside showed the highest degree of partitioning into liposomes or affinity with these bilayer structures (highest K values).

Alterations in the activities of hepatic plasma-membrane and microsomal enzymes during liver regeneration.

A marked increase in the activities of rat liver plasma-membrane (Na+ + K+)-stimulated ATPase and microsomal Ca2+-stimulated ATPase was observed 18h after partial hepatectomy. Lipid analyses for both membrane preparations reveal that in partially hepatectomized rats the cholesterol and sphingomyelin content are decreased with a subsequent decrease in the cholesterol/phospholipid molar ratio compared with those of sham-operated animals. Changes in the allosteric properties of plasma-membrane (Na+ + K+)-stimulated ATPase by F- (as reflected by changes in the Hill coefficient) indicated a fluidization of the lipid bilayer of both membrane preparations in 18 h-regenerating liver. The amphipathic dodecyl glucoside incorporated into the hepatic plasma membranes evoked a marked increase in the (Na+ + K+)-stimulated ATPase and 5'-nucleotidase activities. The lack of effect of the glucoside on the Lubrol-PX-solubilized 5'-nucleotidase indicates that changes in the activities of the membrane-bound enzymes caused by the glucoside are due to modulation of the membrane fluidity. Dodecyl glucoside appears to increase the membrane fluidity, evaluated through changes in the Hill coefficient for plasma-membrane (Na+ + K+)-stimulated ATPase. The biological significance of these data is discussed in terms of the differences and changes in the interaction of membrane-bound enzymes with membrane lipids during liver regeneration.

The Surface Tension and the Critical Micelle Concentration in Aqueous Solution of β-d-Alkyl Glucosides and their Mixtures

Abstract The surface tension in aqueous solutions of β-d-alkyl glucoside and their mixtures at 25°C has been measured. The CMC was determined from the inflexions of the curves; octyl glucoside, 0.025 mol./1., decyl glucoside 0.0022 mol./1., dodecyl glucoside, 0.00019 mol./1. The effect of hydrocarbon chain length was explained theoretically. The CMC of mixtures has been also explained by the extension of the theory of ionic agents. The effect of added sodium chloride, calcium chloride and sodium sulfate on the surface tension in aqueous solution of octyl glucoside has been measured. The effect of added salts on the CMC was determined from the inflexions of the surface tension vs. logarithm of concentration curves.