Sodium n-dodecyl sulfate

Fig. 4.2 Equilibrium adsorption of sodium n-dodecyl sulfate on carbon black, Ti02, and Graphon at room temperature [41].

Rhodium complex Hydroformylation Olefin+ Sodium n-dodecyl sulfate 7-120 > 79... 

Sodium dodecyl sulfate Sodium n-dodecyl sulfate. See Sodium lauryl sulfate... 

Synonyms Dodecyl alcohol, hydrogen sulfate, sodium salt Dodecyl sodium sulfate Dodecylsulfate sodium salt Lauryl sodium sulfate Lautyl sulfate sodium salt Monododecyl sodium sulfate SDS SLS Sodium dodecyl sulfate Sodium n-dodecyl sulfate Sodium monododecyl sulfate Sulfuric acid monododecyl ester sodium salt Classification Alkyl sulfate salt Definition Sodium salt of lautyl sulfate Empirical C,2H2s04S Na Formula CH3(CH2),oCH20SOsNa... 

Sodium 2-(dodecyloxy)-2-oxoethane-1 -sulfonate. See Sodium lauryl sulfoacetate Sodium dodecyl sulfate Sodium n-dodecyl sulfate. See Sodium lauryl sulfate Sodium DTPA. See Pentasodium pentetate Sodium DVB/acrylates copolymer Definition Sodium salt of a polymer of divinyl benzene and one or more monomers consisting of acrylic acid, methacrylic acid, or their simple esters... 

The solubility characteristics of surfactants are quite different from ordinary salts in water. For instance, the solubility of sodium n-dodecyl sulfate (NaDDS) in water is low, ca. 8 mM, at temperatures lower than 16 °C, while it abruptly increases at temperatures greater than 16 °C. This dependence of solubility on temperature as found for all ionic surfactants, is called the Krafft point. [5]. On the other hand, the solubility of nonionic surfactants (such as alkyl ethoxyethanol with varying number of ethyleneoxide units) exhibits negative solubility in water, that is they become insoluble at a temperature called the Cloud point. In the case of ionic surfactants, the solubility increases drastically at the Krafft point due to the formation of micelles. On the other hand, in the case of nonionic surfactant aqueous solutions, the micellar phase separates into an almost pure surfactant phase at temperatures greater than Cloud point [5,6]. 

Frejd and coworkers then used lactam 45 as a structural H-Phe-Phe-OH mimic in peptides (116). The resulting conjugate 48 was expected to function as a structural mimic of substance P (Scheme 5.25). However, CD spectroscopic studies indicated that the constraints imposed by the l,l -ferrocenophane prohibited the peptide to adopt the characteristic a-hehcal secondary structure found for native SP in a biomimetic SDS (Sodium n-Dodecyl Sulfate) micellar environment. In another interesting paper, Frejd and coworkers prepared a [Leu ]-Enkephalin mimetic in which the H-Tyr-Gly-Gly-Phe-subunit has been replaced by a Gly-Gly-looped l,l -ferrocenyl-bis-alanine residue (49, Scheme 5.25) [117]. The ferrocene Cp rings of this constrained compound constitute a substitute for the aromatic phenol (Tyr) and phenyl (Phe) rings. NMR-spectroscopic studies revealed this... 

Materials Triton-X-100, Nonylphenol (NP) with varying ethyleneoxide units (NP-10, NP-13, NP-18) were used as supplied. Sodium-n-dodecyl sulfate (NaDDS) was used as supplied by B.D.H.U.K. (purity >99%). 

A CMC value of 5.8 X 10 mol/L has been reported recently in the literature for sodium cyclododecyl sulfate, illustrating the strong control of molecular structure on the physico-chemical properties of surfactants [20]. The steric hindrance of the cyclic hydrocarbon group of this unusual surfactant is responsible for a large shift to higher CMC values, versus sodium n-dodecyl sulfate. 

Bordbar, A.K., Moosavimovahedi, A.A., and Sabouiy, A.A., Comparative thermodynamic stability of bovin and pigeon hemoglobins by interaction with sodium N-dodecyl sulfate, Thermochim. Acta., 1996, vol. 287, no. 2, pp. 343-349. 

Sodium n-dodecyl sulfate or sodium lauryl sulfate II... 

Polymers consisting of t-butyl acrylate, methacrylic acid, sodium ether dodecyl sulfate, and n-dodecylthiol were prepared by Drohmann [4] and used in hairsprays. 

Jones, M.N. Manley, P. Midgley, P.J.W. Wilkinson, A.E. Dissociation of bovine and bacterial catalases by sodium normal-dodecyl sulfate. Biopolymers 1982, 21 (7), 1435-1450. 

Xu Z H, Ducker W and Israelachvili J N 1996 Forces between crystalline alumina (sapphire) surfaces in aqueous sodium dodecyl sulfate surfactant solutions Langmuir 12 2263-70... 

The methacrylic backbone structure makes the spherical Toyopearl particles rigid, which in turn allows linear pressure flow curves up to nearly 120 psi (<10 bar), as seen in Fig. 4.45. Toyopearl HW resins are highly resistant to chemical and microbial attack and are stable over a wide pH range (pH 2-12 for operation, and from pH 1 to 13 for routine cleaning and sanitization). Toyopearl HW resins are compatible with solvents such as methanol, ethanol, acetone, isopropanol, -propanol, and chloroform. Toyopearl HW media have been used with harsh denaturants such as guanidine chloride, sodium dodecyl sulfate, and urea with no loss of efficiency or resolution (40). Studies in which Toyopearl HW media were exposed to 50% trifluoroacetic acid at 40°C for 4 weeks revealed no change in the retention of various proteins. Similarly, the repeated exposure of Toyopearl HW-55S to 0.1 N NaOH did not change retention times or efficiencies for marker compounds (41). 

FIGURE 10.10 Analysis of peptides on SynChopak GPC peptide. Mobile phase 0.1 N sodium phosphate, pH 7. 0.1% sodium dodecyl sulfate. (From MICRA Scientific. Inc., with permission.)... 

If the coupling component is not ionic, however, more dramatic effects occur, as found by Hashida et al. (1979) and by Tentorio et al. (1985). Hashida used N,N-bis(2-hydroxyethyl)aniline, while Tentorio and coworkers took 1-naphthylamine and l-amino-2-methylnaphthalene as coupling components. With cationic arenediazo-nium salts and addition of sodium dodecyl sulfate (SDS), rate increases up to 1100-fold were measured in cases where the surfactant concentration was higher than the critical micelle concentration (cmc). Under the same conditions the reaction... 

The protein was purified by a dialysis procedure, denatured and analysed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). Western blotting indicated that the protein of interest consisted of two components, one of which increased in concentration as the purification proceeded. The authors initially suggested that this could be due to the presence of a number of species produced by modification of the amino acid side-chains, for example, by glyco-sylation, or by modification of the C- or N- terminus. 

Ethoxylated methylcarboxylates Propoxyethoxy glyceryl sulfonate Alkylpropoxyethoxy sulfate as surfactant, xanthan, and a copolymer of acrylamide and sodium 2-acrylamido-2-methylpropane sulfonate Carboxymethylated ethoxylated surfactants (CME) Polyethylene oxide (PEG) as a sacrificial adsorbate Polyethylene glycols, propoxylated/ethoxylated alkyl sulfates Mixtures of sulfonates and nonionic alcohols Combination of lignosulfonates and fatty amines Alkyl xylene sulfonates, polyethoxylated alkyl phenols, octaethylene glycol mono n-decyl ether, and tetradecyl trimethyl ammonium chloride Anionic sodium dodecyl sulfate (SDS), cationic tetradecyl trimethyl ammonium chloride (TTAC), nonionic pentadecylethoxylated nonylphenol (NP-15), and nonionic octaethylene glycol N-dodecyl ether Dimethylalkylamine oxides as cosurfactants and viscosifiers (N-Dodecyl)trimethylammonium bromide Petrochemical sulfonate and propane sulfonate of an ethoxylated alcohol or phenol Petrochemical sulfonate and a-olefin sulfonate... 

Guttman, A., Shieh, P, Lindahl, J., and Cooke, N., Capillary sodium dodecyl sulfate gel electrophoresis of proteins. II. On the Ferguson method of polyethylene oxide gels, /. Chromatogr., 676, 227, 1994. 

Abbreviations. aT = a-tocopherol, AC = aminocoumarin, ANS = l-anilino-8-naphthalenesulfonic acid, CTAB = cetyltrimethylammonium bromide, DPPC = dipalmitoylphosphatidylcholine, DPPH — l,l-diphenyl-2-picrylhydrazyl, DSHA = Ai-dansylhexadecylamine, GMO = glycerol monooleate, HC = hydrocoumarin, N,N -DOC = JV,JV -di(octadecyl)oxacarbocyanine, PC = phosphatidylcholine, p-CUO = pyrene caroboxaldehyde, SDES — sodium decyl sulfate, SDS — sodium dodecyl sulfate, STS = sodium tetradecyl sulfate. 

Massaccesi reported the development of a two-phase titration method for the analysis of miconazole and other imidazole derivatives in pure form and in pharmaceutical formulation [14], To the sample (10 mg) are added 10 mL of water, 10 mL of 1 M-sulfuric acid, 25 mL of dichloromethane and 1 mL of 0.05% indophenol blue (C.I. No. 49700) in dichloromethane solution and the solution is titrated with 10 mM sodium dodecyl sulfate until the color of the organic phase changes from blue to pale yellow. Results obtained for the drug in pure form, tablets, suppositories, cream and lotion agreed with the expected values and the coefficient of variation (n = 6) were 0.3-0.35%. Imidazole and the other constituents of the pharmaceutical preparations did not interfere. 

CaM was purified from porcine brain. The purity of proteins was examined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and isoelectric focusing. CaM and PDE were cross-linked with l-ethyl-3(3-dimethylamino-propyl) carbodiimide (EDC) or N-succinimidyl 3-(2-pyridyldithio)propionate (SPDP) in a buffer solution of 0.1 M HEPES (pH 7.1) in the presence of 1 mM CaCl2. After a buffer solution containing 2 mM EGTA added into the reaction solution, the CaM-PDE hybrid was separated from other ingredients by gel chromatography on a Sepharose CL-6B solumn. 

RF RIC RMM RSD S/N SDM SD SDS-PAGE spectrometry radiofrequency reconstructed ion chromatogram relative molecular mass relative standard deviation signal-to-noise ratio selected-decomposition monitoring standard deviation sodium dodecyl sulfate-polyacrylamide gel electrophoresis... 

---