Sodium dodecyl sulfate solution preparation

The effects of pH on electrokinetic velocities in micellar electrokinetic chromatography was studied by using sodium dodecyl sulfate solutions [179]. Micellar electrokinetic capillary chromatography with a sodium dodecyl sulfate pseudostationary phase has been used to determine the partition constants for nitrophenols, thiazolylazo dyes, and metal chelate compounds [180]. A similar technique was used to separate hydroquinone and some of its ether derivatives. This analysis is suitable for the determination of hydroquinone in skin-toning creams [181]. The ingredients of antipyretic analgesic preparations have also been determined by this technique [182], The addition of sodium dodecyl sulfate improves the peak shapes and resolution in chiral separations by micellar electrokinetic chromatography [183]. 

Composite prepared by mixing sol-gel-derived Ti02 with SWCNT and an aqueous sodium dodecyl sulfate solution... 

Sodium dodecyl sulfate (SDS) Prepare 10 % stock solution (w/v) and store at room temperature. 

For the investigation of molecular recognition in micelles, adenine derivatives and positively charged (thyminylalkyl)ammonium salts such as shown in Figure 30 were prepared, which were solubilized in sodium dodecyl sulfate (SDS) solutions. Nmr studies have shown that binding occurs in a 1 1 molar ratio in the interior of the micelles as illustrated in Figure 30 (192). 

Vinodgopal et al. prepared Pt/Ru bimetallic nanoparticles by sonochemical reduction of Pt(II) and Ru(III) in aqueous solutions. TEM images indicated that sequential reduction of the Pt(II) followed by the Ru(III) produced Pt-core/Ru-shell bimetallic nanoparticles. In the presence of sodium dodecyl sulfate (SDS), as a stabilizer, the nanoparticles had diameters between 5 and 10 nm. When PVP was used as the stabilizer, the rate of reduction is much faster, giving ultrasmall bimetallic nanoparticles of ca. 5nm diameter [141]. 

The luminescence of macrocrystalline cadmium and zinc sulfides has been studied very thoroughly The colloidal solutions of these compounds also fluoresce, the intensity and wavelengths of emission depending on how the colloids were prepared. We will divide the description of the fluorescence phenomena into two parts. In this section we will discuss the fluorescence of larger colloidal particles, i.e. of CdS particles which are yellow as the macrocrystalline material, and of ZnS particles whose absorption spectrum also resembles that of the macrocrystals. These colloids are obtained by precipitating CdS or ZnS in the presence of the silicon dioxide stabilizer mentioned in Sect. 3.2, or in the presence of 10 M sodium polyphosphate , or surfactants such as sodium dodecyl sulfate and cetyldimethylbenzyl-ammonium... 

Bimetallic Au/Pd nanoparticles were prepared by ultrasound irradiation of a mixture solution of NaAuCl4-H20/PdCl2 2NaCl-3H20 by which the Au and Pd ions were reduced to the metallic state. The Mossbauer spectra of AuPd-SDS particles, with SDS (sodium dodecyl sulfate) representing the surfactant of the system, consist of two components, one for the pure Au core and the other for the alloy layer at the interface of Au core and Pd shell [435]. 

Homogenize 50 g of a prepared sample with a solution containing 50 mL of borate buffer (pH 10) and 50 mL of acetone in a blender for 5 min. Pour the homogenate into an Erlenmeyer flask, add 50 mL of acetone and shake the flask for 10 min using a shaker. Filter the aqueous acetone extract through a 25G-4 glass filter overlaid with 3 g of Celite. Wash the residue on the filter with 50 mL of acetone. Combine the filtrates and remove acetone by rotary evaporation. Transfer the residue with 5 mL of 4% sodium dodecyl sulfate aqueous solution into a separatory funnel, extract the solution with two portions of 50 mL of dichloromethane and collect the organic... 

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. 

A 100-ml standard apparatus (round-bottomed flask, several inlets for stirrer, reflux condenser, nitrogen flux or vaccum,thermometer, heating bath) is evacuated and filled with nitrogen three times.The following solutions are prepared a) 500 mg of sodium oleate (or sodium dodecyl sulfate) in 16 ml of degassed water b) 125 mg (0.32 mmol)... 

Add 2 ml of 10% sodium dodecyl sulfate (SDS appendix 2a for 20% solution) in deionized water to each 100 ml Lowry s reagent D (see recipe). Prepare immediately before use. 

Stock solutions (1000 mg/L in acetonitrile) of 2,4,6-trinitrotoluene (TNT), 1,3,5-trinitrobenzene (TNB), 2,4-dinitrotoluene (2,4-DNT), and 4-amino-2,6-dinitrotoluene (4-Am-2,6-DNT) (Supelco). Sodium dodecyl sulfate (SDS) and sodium borate 10-hydrate. Standard solutions of the various explosives should be prepared daily (using the proper safety precautions) in an SDS-containing electrophoresis buffer. Platinum and silver wires, 0.1mm diameter. 

Transfer buffer—We suggest that this solution be prepared fresh on the day of the experiment. Dissolve 11.6 g of Tris base, 5.86 g of glycine, and 0.038 g of sodium dodecyl sulfate in 700 ml of distilled water. Adjust pH to 9.2 with HC1 or NaOH as needed. Add 200 ml of methanol. Bring the final volume of the solution to 1 liter with distilled water. Store this solution tightly covered at room temperature. 

Solution of 0.2 NNaOH and 1% SDS—Prepare a 10 N NaOH stock solution by dissolving 200 g of NaOH in 300 ml of water. Bring the final volume of the solution to 500 ml with distilled water and store in a plastic (not glass) bottle at room temperature. Prepare a separate 10% (wt/vol) SDS solution by dissolving 10 g of sodium dodecyl sulfate in 70 ml of water. You may have to heat the solution slightly to allow all of the SDS to dissolve. Bring the final volume of the solution to 100 ml with distilled water and store at room temperature. To prepare the 0.2 N NaOFI/1% SDS solution immediately before the experiment, mix 2 ml of the 10N NaOH stock solution and 10 ml of the 10% (wt/vol) SDS stock solution with 88 ml of distilled water. 

A typical procedure for the preparation of a concentrated emulsion is as follows. A small amount of an aqueous solution containing sodium dodecyl-sulfate (SDS) was placed in a single neck flask (100 ml capacity) equipped with a mechanical stirrer. Styrene containing the initiator Azobisisobutyronitrile (AIBN) was added to the aqueous solution, with stirring. The whole preparation process of the concentrated emulsion lasted for 10-15 min at room temperature. 

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