Critical micelle concentration of surfactants in aqueous buffered and unbuffered systems

Fuguet, Elisabet; Ràfols, Clara; Rosés, Martı́; Bosch, Elisabeth

doi:10.1016/j.aca.2005.05.069

Cited by 356 publications

(232 citation statements)

References 31 publications

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“…The CMC value is clearly lower in phosphate buffer as a result of the well known electrolyte effect on micelle formation [2,3,20]. The electrolyte neutralizes the charge at the micelle surface, reduces the thickness of the ionic layer around the surfactant ionic heads and, therefore, the electrostatic repulsions between them, helping in this way the micellization process.…”

Section: Surface Tension Experimentsmentioning

confidence: 99%

“…In fact, the salts of phosphate buffer ionise in solution and the sodium and potassium ions tend to condense the counterions onto the micelle surface. This results in a decrease of the ionization degree and an increase in the aggregation number [2]. Also, the decrease of electrostatic repulsive force between polar head makes the micelles more compact and less hydrated [3].…”

Section: Esr Study Of Sds Aqueous Solutionsmentioning

confidence: 99%

“…Some spectroscopic probes are able to modify the CMC value of surfactants [2,17]. (This results from interactions between the surfactant monomers and the probes, which alter the micellization process.…”

Section: Surface Tension Experimentsmentioning

confidence: 99%

“…Surface tension [1], electrical conductivity [2], light scattering [3] [4], and various spectroscopic technique [5][6][7] have been used to measure critical micelle concentration (CMC), aggregate size, and aggregation number of surfactants. Local parameters like micropolarity and microviscosity were studied in order to better understand micellar self-assembly.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of SDS, DTAB and CTAB micelle microviscosities by electron spin resonance

Bahri

Hoebeke

Grammenos

et al. 2006

Colloids and Surfaces A: Physicochemical and Engineering Aspect

151

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Electron spin resonance spectroscopy (ESR) of the nitroxide labelled fatty acid probes (5-, 16-doxyl stearic acid) was used to monitor the micelle microviscosity of three surfactants at various concentrations in aqueous solution: sodium dodecyl sulphate (SDS), dodecyltrimethylammonium bromide (DTAB) and cetyltrimethylammonium bromide (CTAB). At low surfactant concentration, there is no micelle, the ESR probe is dissolved in water/surfactant homogeneous phase and gives his microviscosity. At higher surfactant concentration, an abrupt increase in microviscosity indicates the apparition of micelles and, the solubilization of the probes in micelles. The microviscosity of the three surfactants, in a large surfactant range, was obtained as well as the critical micelle concentration (CMC). The microviscosity increased slightly with the increase in surfactant concentration. Phosphate buffer lowered the CMC value and generally increased the microviscosity.

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Section: Surface Tension Experimentsmentioning

confidence: 99%

Section: Esr Study Of Sds Aqueous Solutionsmentioning

confidence: 99%

Section: Surface Tension Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of SDS, DTAB and CTAB micelle microviscosities by electron spin resonance

Bahri

Hoebeke

Grammenos

et al. 2006

Colloids and Surfaces A: Physicochemical and Engineering Aspect

151

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“…The CMC of SDS has been determined many times in the literature using a number of different methods. In water at 25°C measurements of the CMC of SDS range from 8.3 mM [14] using capillary electrophoresis, 8.3 mM using a temperature shock method in combination with the dye acridine orange and UV visible spectroscopy, 8.1 ± 0.12 mM to 7.0 mM [15] by conductance measurements [16] and titration calorimetry [17]. The CMC of SDS shows slight temperature dependence with literature values at 30°C in water of 7.3 ± 0.3 mM [18] and 7.2 mM at 40°C and a general decrease in CMC with increasing temperature [19].…”

mentioning

confidence: 99%

A low volume 3D-printed temperature-controllable cuvette for UV visible spectroscopy

Pisaruka

Dymond

2016

Analytical Biochemistry

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We report the fabrication of a 3D-printed water-heated cuvette that fits into a standard UV visible spectrophotometer. Full 3D-printable designs are provided and 3D-printing conditions have been optimised to provide options to print the cuvette in either acrylonitrile butadiene styrene or polylactic acid polymers, extending the range of solvents that are compatible with the design. We demonstrate the efficacy of the cuvette by determining the critical micelle concentration of sodium dodecyl sulphate at 40°C, the molar extinction coefficients of cobalt nitrate and dsDNA and by reproducing the thermochromic UV visible spectrum of a mixture of cobalt chloride, water and propan-2-ol. Analytical Biochemistry 510 (2016) 52-55 Accepted 15 July 2016In recent years there has been a rapid expansion in the number and quality of commercially available, affordable, fused deposition modelling (FDM) 3D-printers. These FDM 3D-printers allow end users to design, test and construct bespoke 3D-fabricated plastic prototypes targeted to their own individual applications [1]. Researchers in the chemical and biomedical sciences have made bespoke integrated reactionware [2][3][4][5][6][7], DNA adhesives [8], inserts for cuvettes [9] or X-ray absorption spectroscopy [10] that enable spectroelectrochemistry to be performed, surgical models and synthetic organs [11] and microfluidic pumps [12]. However, whilst there are a significant number of recent research success stories demonstrating the potential applications of 3D-printers, a number of key challenges remain. In particular the additive manufacturing process of FDM printing has a tendency to create small gaps between successive extruded layers, meaning 3D-prints are not always air or watertight. This is a particular challenge for FDM 3D-printing in milli or microfluidic applications where the pressure in the device is increased. Strategies for solving this leakage problem differ, one approach is to construct devices with increased wall thicknesses, typically 4 mm [3], although this does impose a lower limit on the size of device that can be constructed. Alternatively, recent work [13] has shown that many of these printing imperfections in ABS prints can be removed with acetone and that 3D-prints treated in this way, post production, have potential uses in fluid handling on a variety of scales.Here we report our recent success using FDM 3D-printing to develop an inexpensive water heated UV visible cuvette made from ABS or PLA, which fits into a standard UV visible spectrometer.UV visible spectroscopy was performed on a dual beam Shimadzu Corporation UV-2410PC spectrometer equipped with a single monochromator. BRAND® disposable polystyrene cuvettes (Sigma-Aldrich UK) were used for control studies. Cobalt nitrate, sodium dodecyl sulphate (SDS) and dsDNA from salmon sperm were purchased from Sigma-Aldrich UK. Cobalt chloride was purchased from ACROS organics UK and acetone, propan-2-ol and methylene blue were purchased from Fisher Scientific UK. A REFCO (-1 to 3 Bar; class 1.6) p...

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Gram‐Positive Bacteria Cell Wall Driven Self‐Disassembled Nanovesicles against Methicillin‐Resistant Staphylococcus Aureus

Fei

Yan

et al. 2020

Advanced Therapeutics

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In the delivery system, high‐performance targeting and local burst‐releasing of antibiotics enable the enhancement of antipathogen efficacy and reduction of drug‐resistance risk. Bacteria cell wall driven self‐disassembled nanovesicles (BSNs) composed of a dense H‐aggregated cyanine bilayer are herein reported. The nanovesicle displays the trigger‐disassembly and turn‐on near infrared (NIR) fluorescence property activated by Gram‐positive bacteria. Mechanistic studies indicate that the interaction between nanovesicles and lipoteinchoic acid within the bacterial cell wall disrupts nanovesicles and the free cyanine molecules insert into the network of peptidoglycan, which brings recovered fluorescence. Meanwhile, owing to the burst release of the oritavancin antibiotic payload inside the nanovesicle, the minimum inhibitory concentration of oritavancin is significantly reduced by fourfold compared to that of the free one. Intriguingly, this smart nanoantibiotic effectively enhances the defense against methicillin‐resistant Staphylococcus aureus both in vitro and in vivo, meanwhile the NIR fluorescence signal enables quantitative bioimaging of the therapuetic outcome.

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Critical micelle concentration of surfactants in aqueous buffered and unbuffered systems

Cited by 356 publications

References 31 publications

Investigation of SDS, DTAB and CTAB micelle microviscosities by electron spin resonance

Investigation of SDS, DTAB and CTAB micelle microviscosities by electron spin resonance

A low volume 3D-printed temperature-controllable cuvette for UV visible spectroscopy

Gram‐Positive Bacteria Cell Wall Driven Self‐Disassembled Nanovesicles against Methicillin‐Resistant Staphylococcus Aureus

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