Chromatographic analysis of sodium

While RPLC and RPIPC techniques applied with UV detection have already been elaborated for analyzing saccharin and acesulfam-K [67,68], the liquid chromatographic analysis of sodium cyclamate is barely substantiated in the literature because of the non-chromophoric structure of this compound. The only exception is the HPLC method introduced by Hermann et al. with direct photometric detection [69],... 

Gas Chromatographic Analysis of Sodium Di-n-propylacetate in Human Plasma... 

The side-chain chlorine contents of benzyl chloride, benzal chloride, and benzotrichlorides are determined by hydrolysis with methanolic sodium hydroxide followed by titration with silver nitrate. Total chlorine determination, including ring chlorine, is made by standard combustion methods (55). Several procedures for the gas chromatographic analysis of chlorotoluene mixtures have been described (56,57). Proton and nuclear magnetic resonance shifts, characteristic iafrared absorption bands, and principal mass spectral peaks have been summarized including sources of reference spectra (58). Procedures for measuring trace benzyl chloride ia air (59) and ia water (60) have been described. 

Pure (A)-1 -chloropropene was obtained by careful distillation of a mixture of (E)- and ( )-l -chloropropene (available from Columbia Organic Chemicals Company Inc.) using a Nester-Faust Teflon annular spinning band column [(Z)-l-chloropropene has b.p. 33° (A)-l-chloropropene has b.p. 37°]. Small quantities of powdered sodium bicarbonate and hydroquinone (1,4-benzenediol) placed in the distillation flask inhibit acid-catalyzed isomerization and polymerization. Gas chromatographic analysis of the material used in these experiments on a 4-m., 15% l,2,3-tris(2-cyanoethoxy)propane (TCEP) on Chromosorb P column, operated at room temperature, typically indicated that it had isomeric purity >99.9%. (A)- 1-Chloropropene is stable for several months at room temperature, but it should be stored in a cool place. 

Okuno, I., G.E. Connolly, P.J. Savarie, and C.P. Breidenstein. 1984. Gas chromatographic analysis of coyote and magpie tissues for residues of compound 1080 (sodium fluoroacetate). Jour. Assoc. Offic. Anal. Chem. 67 549-553. 

MW Dong, JR Gant. High-speed liquid chromatographic analysis of amino acids by post-column sodium hypochlorite-o-phthalaldehyde reaction. J Chromatogr 327 17-25, 1985. 

Munger, D., Stemson, L.A., Repta, A.J., and Higuchi, T., High-performance liquid chromatographic analysis of dianhydrogalactitol in plasma by derivatization with sodium diethyldithiocarbamate, J. Chromatogr., 143, 375, 1977. 

The reactant concentrations of 48 g of sodium aluminate and 105 g of lactose are equivalent to a mol ratio of two mols of aluminate to one mol of lactose. The mixture was then heated to 50°C and 100 ml aliquots were removed at periodic intervals to determine the level of conversion. The reaction was terminated after three hours by adding sufficient 30% HCI to lower the pH to 4.2. The pH was then raised to neutrality, i.e., 6.5 to 7.0, with ammonium hydroxide so as to completely precipitate insoluble aluminum hydroxide. The precipitate was then removed by vacuum filtration and the filtrate was analyzed for the presence of ketose sugar by chromatographic analysis. The chromatographic analysis of the filtrate confirmed that the main component of the filtrate was lactulose and not the monosaccharide ketose sugar, fructose. 

E. P. Scott, Application of post column ionization in the high performance liquid chromatographic analysis of butabarbital sodium elixir, J. Pharm. Sci., 72 1089 (1983). 

B. Atropaldehyde diethyl acetal. A mixture of 18.7 g (0.100 mol) of 1, l-dichloro-2-phenylcyclopropane, 16 g (0.40 mol) of sodium hydroxide, and 160 mL of ethanol is placed in a 250-mL flask fitted with a reflux condenser. The mixture is heated under reflux for 24 hr. Some bumping may occur. Water (200 mL) is added, and the mixture is extracted with three 30-mL portions of petroleum ether. The extracts are combined, dried as above with magnesium sulfate, concentrated in vacuo, and distilled through a 20-cm Vigreux column. The acetal begins to distil at about 70°C (0.5 mm), and the product is collected until the temperature reaches about 100°C. The yield is 14-15 g (68-73%). Gas chromatographic analysis of the product shows it to be about 85% pure (Note 6). 

SBSE can be successfully used in the analysis of environmental samples [93-97] and for food analysis [98, 99]. PDMS is the most commonly used polymer, primarily because of its thermal stability and durability. SBSE has been modified by application of derivatization with different reagents (acetic anhydride, BSTFA, etc) [100-104]. This approach is suitable for the extraction of compounds requiring derivatization. The use of multistep derivatization with several extraction elements (each reaction is performed on a different stir bar) allows efficient extraction, desorption, and chromatographic analysis of compounds with different functional groups (e.g., phenols, steroids, amines, thiazoles, ketones). Acetic anhydride (ester formation), ethyl chloroformate (reaction of acids and amines), tetraethyloborane, and sodium bis-trimethylotrifluoroacetamide have been used for extraction and simultaneous derivatization [105]. 

Benzoin acetate (5) and the keto diacetate (d) are the major products (according to gas chromatographic analysis) of oxidation of diphenylacetylene at a carbon anode and in acetic acid containing sodium acetate. The keto-diacetate is readily converted into benzil. Under these conditions acetate ion would be oxidized at <2-2 V (vs. 

Hogue DR, Zimmardi JA, Shah KA. High-performance liquid chromatographic analysis of docusate sodium in soft gelatin capsules./ Pharm Sci 1992 81 359—361. 

Amoxicillin dimer, present as an impurity in amoxicillin sodium salt, was isolated and characterised as VII [SO], More detailed characterisation, together with data on amoxicillin trimer, was given in [48], Both compounds were isolated from an aged 20% solution of amoxicillin sodium salt, chromatographic analysis of which also indicated the presence of a tetramer and the penicilloates corresponding to these three oligomers. 

An interlaboratory study was conducted to assess the capabilities of standard ion-exchange chromatographic methods and NMR at 80.9 MHz for the analysis of sodium tripolyphosphate. Three well-mixed, but separate, samples of commercial sodium tripolyphosphate were submitted to each laboratory in triplicate, representing three different levels of tripolyphosphate. Protocol was maintained consistent among methods/sites. 

Rapaka, R.S. Knight, P.W. Prasad, V.K. Reversed-phase high-performance liquid chromatographic analysis of lioth3fronine sodium and levothyroxine sodium in tablet formulations preliminary studies on dissolution and content uniformity. J.Pharm.Sci., 1981, 70, 131-134... 

Using the silver polyphosphates obtained by the above procedures, one can determine the chemical composition of the polyphosphates and thereby estimate the structure of a given sodium meta-arsenate-phosphate. Several methods can be used for this purpose (a) paper chromatographic analysis of the polyphosphates, (b) determination of Ag/P ratios of the silver polyphosphates, (c) titrimetric determination of weak acid hydrogen of the polyphosphates, (d) measurement of depression of transition points of sodium sulfate decahydrate by the addition of the polyphosphates, and (e) fractional precipitation of the polyphosphates with silver nitrate... 

Fig. 1A-C. Chromatographic analysis of (ADP-ribose)n residues associated with HMG proteins and histone HI isolated from control and 3-ABm treated cells. Radioactive material (fraction V, control) was treated with 0.3 N NaOH for 1 h at 0°C (A). Fraction V [control (B) and 3-ABm (C)] was digested with snake venome phosphodiesterase for 3 h at 37°C. The hydrolytic product was analyzed by cellulose thin layer chromatography, a solvent system containing 0.1 A/ sodium phosphate buffer (pH 6.8) ammonium sulfate, and -propanol (100 60 2, v/w/v)...

Figure 10.99 Trace analysis of sodium in the presence of a high excess of monoethanolamine on a crown ether-modified stationary phase. Chromatographic conditions see Figure 10.98 injection volume 25pL peaks lOpg/L sodium (1) and 200mg/L monoethanolamine (2).

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