Sodium laurate

Davies [114] found that the rates of desorption of sodium laurate and of lauric acid films were in the ratio 6.70 1 at 21.5°C at molecular areas of 90 and 60 per molecule, respectively. Calculate o. the potential at the plane CD in Fig. XV-12. 

Amphiphilic Molecules. In just about all cases of lyotropic Hquid crystals, the important component of the system is a molecule with two very different parts, one that is hydrophobic and one that is hydrophilic. These molecules are called amphiphilic because when possible they migrate to the iaterface between a polar and nonpolar Hquid. Soaps such as sodium laurate and phosphoHpids such as a-cephalin [5681-36-7] (phosphatidylethanolamine) (2) are important examples of amphiphilic molecules which form Hquid crystal phases (see Lecithin Soap). 

Sodium dodecanoate (sodium laurate) [629-25-4] M 222.3, pK 5.3 (-COOH). Neutralised by adding a slight excess of dodecanoic acid, removing it by ether extraction. The salt is recrystd from aq soln by adding pure Me2CO and repeating the process (see sodium decanoate on p. 468). Also recrystd from MeOH. 

The contents of the flask are transferred to a separatory funnel while still hot and washed three times with 200-cc. portions of hot water to remove the sodium laurate (Note 7). The lauryl alcohol is extracted with ether from the cooled mixture and the washings. The combined ether extracts are washed with water, sodium carbonate solution, and again with water, and dried over anhydrous magnesium sulfate. The ether is evaporated and the lauryl alcohol distilled under diminished pressure. The yield is 60-70 g. (65-75 per cent of the theoretical amount) of a product boiling at i43-i46°/i8 mm. or i98-2oo°/i35 mm. (Note 8). 

Unless the sodium laurate is carefully removed, it causes troublesome emulsions. 

The collector used in this experiment was sodium oleate at additions of 300 g/t. In addition to sodium oleate, other fatty acid collectors were examined. The results are given in Table 24.10. From these data, the saturated fatty acid soap was a poor collector for monazite, as well as sodium laurate. 

Research has also been conducted in which steryl phosphonic acid (SPA) was examined in place of benzyl arsonic acid (BAA), which was used in an operating plant in China [5], In this study, several collectors were examined, including sodium laurate, sodium dodecyl sulphate, amino acids, diphosphonic acid (SPA). It was discovered that SPA was the most effective and that aliphatic alcohol (i.e. octanol) was required to maintain the effectiveness of SPA. The use of emulsifier in the mixture was required to provide a suitable emulsion of the composite collector. 

Fatty acids (e.g., sodium caprate, sodium caprylate, sodium laurate, and sodium oleate)... 

A number of cobalt(III) encapsulated cage complexes have been used as electron-transfer agents their advantage over viologens is their long-term stability in photochemical cycles. The most effective complex is [CoL] where L is l-chloro-3,6,10,13,16,19-hexaazabicyclo[6.6.6]eico-sane at a concentration of 4 x 10 mol dm , this cage exhibits a similar ability to methylviolo-gen to produce Laser flash photolysis in sodium dodecyl sulfate and sodium laurate... 

On the other hand, this azo form was observed in other surfactant micelle solutions such as sodium laurate (11) and nonionic surfactants (16). The maximal absorption wavelength is at 535 nm (quinoidal form) in the SDS solution, while at 450 nm (azo one) in the CmPOEn soutlon. 

Vesicles prepared from phosphatidylglyceryl Nanometer-sized, sodium-laurate-coated Fe304 particles In the presence of vesicles, lipids adopted a bilayer configuration around the iron oxide core 792... 

Which would be the more effective detergent in the pH range 2 to 3, sodium lauryl sulfonate or sodium laurate Why ... 

Kolthoff, I. M., and I. K. Miller The chemistry of persulfate. III. The reaction of persulfate with mercaptan solubilized in sodium laurate solutions in the presence of unsaturated compounds. J. Am. Chem. Soc. 74, 4419 (1952). 

Figure 3. Growth of liquid crystalline filaments towards aqueous solution of sodium laurate (right) after it has been contacted with decanol (left) (46)...

FIGURE 2.5 Hypoglycemic effect of insulin administered orally to normal rats by means of coated soft capsules containing an absorption-enhancing formulation (8 IU porcine insulin, 4 mg sodium laurate (Ci2) and 16 mg cetyl alcohol) two capsules RSI (open stars) 2 capsules RS2 (open circles) 2 capsules RS2 + 1 capsule surfactant post-insulin administration (open square) insulin i.p. 4 IU (close circles) 2 placebo capsules (no insulin) (close stars). Each point is the mean SD of five animals for insulin administration and of four animals for controls. RSI and RS2 are capsules coated with various mixtures of Eudragits RS, S, and L. (From Touitou, E. and Rubinstein, A., Int. J. Pharm., 30, 95, 1986. With permission from Elsevier.)... 

Miyake, M., et al. 2004. Development of suppository formulation safely improving rectal absorption of rebamipide, a poorly absorpbable drug, by utilizing sodium laurate and taurine. J Control Rel 99 63. 

Figure 27. Calcium ion sequestering ability of Cn-n secondary alcohol ethoxyl-ates in combination with an anionic surfactant. Test conditions surfactant concentration nonionics—0.1 wt % anionics—0.1 wt % B = without nonionics (blank). ((-%-) with sodium laurate ( A ) with SDS (-A-) with SAS ( M ) with LAS (- A ) with AOS)...

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