Sulfates preparation

The most widely used alkyl sulfate in shampoo preparation is lauryl sulfate. The alkyl component of this sulfate ranges from C-10 to C-18 with a predominance of the C-12 (lauryl) component. By distillation of the fatty alcohol, certain cuts can be obtained which offer the best effects in foaming, cleansing, and rinsing properties for the alkyl sulfate preparation. The range which appears to be most desirable is between C-12 and C-16. Lauryl sulfate detergents are available in various salt forms with the sodium, ammonium, and triethanolamine types being used most frequently in shampoos. 

Residues of non-N-substituted 2-amino-2-deoxy-D-glucose constitute only a tiny fraction (if any) of the total amino sugar of heparin and heparan sulfate. Although free amino groups are produced in the biosynthesis20,23 of heparin (between stages 1 and 2, see Scheme 1), the small proportions occasionally found in heparin and heparan sulfate preparations are most probably the result of some N-desulfation during extraction, or purification, or both. 

Fig. 5.1.4 (A) TEM and (B) SEM of rodlike particles of basic cerium sulfate prepared by...

Fig. 5.2.6 SEM images of the ellipsoidal particles of basic aluminum sulfate prepared in the presence of 1.67 mol dm-3 chloride ions under the otherwise standard conditions. (From Ref. 1.)...

Kosaraju, S.L., Tran, C., Lawrence, A. (2006). Liposomal delivery systems for encapsulation of ferrous sulfate preparation and characterization. Journal of Liposome Research, 16, 347-358. 

To a solution of 70.4 g methyl atropine sulfate (prepared from methyl atropine chloride and silver nitrate) in water was added aqueous solution of 26.1 g barium nitrate. Barium sulfate was deleted by filtration. Filtrate was concentrated and the methyl atropine nitrate was obtained. 

Bentley A, Piper K. 1987. X-ray contrast media. Part 1. Barium sulfate preparations. Pharm J 238 138-139. 

Volf V, Roth Z. 1966a. Retention of strontium 85 in rats II, Effect of various barium sulfate preparations as influenced by soluble sulfates, carrier strontium, and by the physiologic state of animals. Acta Radiol Ther Phys Biol 4 113-128. 

Assay Dissolve about 1 g of sample, accurately weighed, in a mixture of 150 mL of water and 10 mL of sulfuric acid in a 300-mL flask. Add 1 drop of orthophenanthroline TS, and immediately titrate with 0.1 A ceric sulfate prepared as indicated in Volumetric Solutions under Solutions and Indicators. Perform a blank determination (see General Provisions), and make any necessary correction. Each milliliter of 0.1 A ceric sulfate is equivalent to 24.00 mg of Fe(OH2)2 (OOCCH2NH2)2. 

Assay Dissolve about 100 mg of sample, accurately weighed, in 20 mL of water add 40.0 mL of 0.1 N ceric sulfate prepared as directed for Volumetric Solutions under Solutions and Indicators (or use a commercially available solution) mix well and add 2 mL of silver sulfate solution (5 g of Ag2S04 dissolved in 95 mL of concentrated sulfuric acid). Cover, heat nearly to boiling, and continue heating for 30 min. Cool to room temperature, and titrate with 0.1 A ferrous ammonium sulfate to a pale yellow color. Add 2 drops of orthophenanthroline TS, and continue the titration to a salmon-colored endpoint, recording the volume required, in milliliters, as S. Perform a residual blank titration (see General Provisions), and record the volume required as B. Each milliliter of the volume B - S is equivalent to 2.650 mg of NaH2P02H20. 

Orthophenanthroline TS Dissolve 150 mg of orthophen-anthroline (C12H8N2-H20) in 10 mL of a solution of ferrous sulfate, prepared by dissolving 700 mg of clear crystals of ferrous sulfate (FeS04-7H20) in 100 mL of water. The ferrous sulfate solution must be prepared immediately before dissolving the orthophenanthroline. Store the solution in well-closed containers. 

Macfarlane, D.E. (1989) Two dimensional benzyldimethyl-n-hexadecylaimnonium chloride-sodium dodecyl sulfate preparative polyacrylamide gel electrophoresis a high capacity high resolution technique for the purification of proteins from complex mixtures. Anal. Biochem. 176,457-463. 

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