Nitration high pressure liquid chromatography

Heath, R. R., J. H. Tumlinson, R. E. Doolittle, and A. T. Proveaux Silver nitrate high pressure liquid-chromatography of geometrical isomers. J. Chromatogr. Sci. 13,... 

Sodum, R.S., Fiala, E.S. (2001). Analysis of peroxynitrite reactions with guanine, xanthine, and adenine nucleosides by high-pressure liquid chromatography with electrochemical detection C8-nitration and oxidation. Chem. Res. Toxicol. 14 438-50. 

Wheeler, G. L., Lott, P. F. Rapid determination of trace amounts on selenium(IV), nitrite and nitrate by high pressure liquid-chromatography using naphthalene-2,3-diamine. Micro-chem. J. 19, 390(1974)... 

Anaerobic Metabolism, To examine the extent of anaerobic chloroaromatic metabolism, we undertook a study in which sediments from the upper Hudson River, the lower Hudson River, and the East River were used as inoculum (33, 34). Each monochlorophenol isomer (2-, 3-, and 4-chloro-phenol, CP) and each monochlorobenzoate isomer (2-, 3-, and 4-chloroben-zoate, CB) was used as substrate. Duplicate or triplicate cultures were established under three anaerobic conditions denitrifying, sulfidogenic, and methanogenic. The initial concentration of each of the chloroaromatic compounds was 0.1 mM incubation was at 30 °C in the dark. Substrates were quantified by high-pressure liquid chromatography N2 and CH4 were analyzed by gas chromatography nitrate and sulfate were determined by colorimetric methods or by ion chromatography (33, 34). 

Most selenium measurements are complicated by the presence of other elements in the sample. In some cases selenium can be separated from interferences by distillation as the bromide, by high pressure liquid chromatography, or by solvent extraction (1, 12, 13). The hydride generation technique provides good separation of selenium from interferences in the atomic absorption technique that has been developed. However, separation from arsenic and mercury is not accomplished, and these elements and the nitrate ion have been found to interfere (14,15). However, the effect of these species on the measurement is not significant for the method developed by the Project. 

The alkamines isolated directly from plant material or obtained by acid or enzymatic hydrolysis of naturally occurring glycosides between 1967 and 1979 are summarized in Table III. Physical me ods are of increasing importance in structure elucidation. Recent papers have dealt with IR spectra (173), H NMR (174,175), NMR (176-178,357,358), EPR (179), ORD (180-183), and MS (184,351,352) of Solanum alkamines. Some X-ray analyses have been carried out since 1967 (58, 81, 149, 185-189, 359). Tables rV-VI survey the characteristic features of H NMR, NMR, and MS of Solanum alkaloids. Silver nitrate-containing adsorption layers were shown to be useful in TLC separation of 5a-saturated and S-unsaturated alkamines (194,195). High-pressure liquid chromatography has been applied successfully for the separation of steroidal Solanum and Veratrum alkamines (373). 

The crucial 3-mercurated cyclic peroxide precursors of can be prepared by mercuric nitrate initiated cyclization of unsaturar-ted hydroperoxides (15). Yields are excellent and the compounds (as the bromide derivatives) can be purified by high pressure liquid chromatography (hplc). Exocyclic products are formed in cyclizations of and 6 with none of the 6-endo products being... 

X. Xu, A.M. van der Craats and P.C.A.M. de Bmyn, Highly sensitive screening method for nitroaromatic, nitramines and nitrate ester explosives by high performance liquid chromatography — atmospheric pressure ionization — mass spectrometry (HPLC-APl-MS) in forensic applications , J. Forensic Sci., 49 No. 6 (2004) 1171-1180. 

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