Selenium speciation analysis

J. Ruiz Encinar, M. Sliwka-Kaszynska, A. Polatajko, V. Vacchina, J. Szpunar, Methodological advances for selenium speciation analysis in yeast, Anal. Chim. Acta, 500 (2003), 171D183. 

Simon, S., Barats, A., Pannier, F., Potin-Gautier, M. Development of an on-line UV decomposition system for direct coupling of liquid chromatography to atomic-fluorescence spectrometry for selenium speciation analysis. Anal. Bioanal. Chem. 383, 562-569 (2005)... 

Infante, H. G., O Connor, G., Wahlen, R., Entwisle, J., Norris, P, et al. Selenium speciation analysis of selenium-enriched supplements by HPLC with ultrasonic nebulisation ICP-MS and electrospray MS/MS detection. J Anal At Spectrom 2004, 19, 1529-1538. 

Camara C, Cobo MA, Palacios R, Munoz R, and Donard OFX (1995) Selenium speciation analyses in water and sediment matrices. In Quevauviller Ph, Maier EA and Griepink B, eds. Quality assurance for environmental analysis, pp 237-262. Elsevier, Amsterdam. 

Kolasa et al. [562] have reported changes in the degree of oxidation of chromium (from Cr6+ to Cr3+) in the course of probe mineralisation of PE for AAS analysis. HPLC-ICP-MS has been used as a selenium-specific detector [563]. Other selenium speciation work by ICP-MS has been reported [564]. Numerous other examples of speciation analysis have been described for the most appropriate techniques (Chapter 7). 

J. Gomez-Ariza, M.-A. Caro-de-la-Torre, I. Giraldez and E. Morales, Speciation analysis of selenium compounds in yeasts using pressurized liquid extraction and liquid chromatography-microwave-assisted digestion-hydride generation-atomic fluorescence spectrometry. Anal. Chim. Acta, 524(1-2), 2004, 305-314. 

Calle, M.B. de la, Scerbo, R., Chiavarini, S., Quevauviller, Ph. and Morabito, R. (1997) Comparison of derivatization methods for the determination of butyl- and phenyl-tin compounds in mussels by gas chromatography. Appl. Organometal. Chem., 11, 693. Cimara, C., Cobo, M.G., Palacios, M.A., Munoz, R. and Donard, O.FX. (1996) Selenium speciation analyses in water and sediment matrices. In Quality Assurance for Environmental Analysis (eds Quevauviller, Ph., Maier, E.A. and Griepink, B.), Vol. 10. Elsevier, Amsterdam, 237. 

Casiot, C., Szpunar, J., Lobinski, R. and Potin-Gautier, M.N. (1999) Sample preparation and HPLC separation approaches to speciation analysis of selenium in yeast by ICP-MS./. Anal. At. Spectrom., 14, 645-650. 

Pyrzynska, K. (1996) Speciation analysis of some organic selenium compounds a review. Analyst, 121, 77R-83R. 

Se Speciation in Plants The presence of a number of volatile Se species was reported in edible allium plants such as garlic by GC-AES [79]. Selenomethionine, Se-methylselenocysteine, and y-glutamyl-Se-methyl-L-seleno cysteine were identibed in garlic and onion by HPLC-ICP-MS and ES-MS/MS [80]. Selenomethionine is the primary species found in all types of nuts (19D25 percent of the total Se) [30], sunBower [81], and mushrooms [36, 37], The distribution of Se among different fractions (lipid extract, low molecular weight, and protein fractions) of nuts and speciation analysis was studied [30]. Selenium was not detected in any of the lipid extracts obtained from the different types of nuts [30], Results obtained for Brazil nuts by SEC with on-line ICP-MS detection showed that approximately 12 percent of total Se was weakly bound to proteins [30],... 

Figure 16.5. Selenium species of interest in food speciation analysis.

Selenium Speciation in Edible Animal Tissues Reports on Se specia-tion analysis in edible animal tissues have been scarce. Speciation analysis of Se in cod muscle tissue was performed by separating the species using both RP- and SE-HPLC prior to ICP-MS detection. The main Se compound found in enzymatic hydrolysates was selenomethionine [42], This selenocompound was absent in MeOHDHCl extracts, indicating that Se was mainly incorporated into proteins. A number of unidentiFed Se species were also detected in cod muscle tissue, the separated Se compounds being quantised on-line by post-column isotope dilution [42], Soluble Se compounds extracted from muscles of chicken, turkey, duck, ostrich, lamb, cattle, and pig were separated by SEC with ICP-MS detection. Four peaks were observed, but distribution of Se among these peaks varied considerably in tissues from different animal species [86]. 

V. Diaz Huerta, L. Hinojosa Reyes, J. M. Marchante-Gay n, M. L. Fernandez Sanchez, A. Sanz-Medel, Total determination and quantitative speciation analysis of selenium in yeast and wheat Bour by isotope dilution analysis ICP MS, J. Anal. Atom. Spectrom., 10 (2003), 1243D1247. 

S. McSheehy, P. Pohl, J. Szpunar, M. Potin-Gautier, R. Lobinski, Analysis for selenium speciation in selenized yeast extracts by two-dimensional liquid chromatography with ICP-MS and electrospray MS-MS detection. J. Anal. Atom. Spectrom., 16 (2001), 68-73. 

S. McSheehy, W. Yang, F. Pannier, J. Szpunar, R. Lobinski, J. Auger, M. Potin-Gautier, Speciation analysis of selenium in garlic by two-dimensional high performance LC with parallel ICP-MS and ESI-MS detection, Anal. Chim. Acta, 421 (2000), 147 D153. 

In past years, on line chromatographic coupling techniques such as HPLC and CE coupled to ICP-MS with the isotope dilution technique have been used for element quantification in speciation analysis. An interesting application of the isotope dilution technique in medical research was proposed recently by Prange and co-workers, who added highly enriched " S, Cu, Zn and Cd spikes to the interface of the CE-ICP-MS system. The authors separated isoforms of metallothionein (e.g., of rabbit liver) by capillary electrophoresis and quantified S, Cd, Cu and Zn concentrations in isoforms by ICP-SFMS using the isotope dilution technique. A new selenized yeast reference material (SELM-1) for methionine, selenomethionine (SeMet) and total selenium content has also certified by an intercomparison exercise. ... 

Wang, R.Y., Hsu, Y.L., Chang, L.F., Jiang, S.J. Speciation analysis of arsenic and selenium compounds in environmental and biological samples by ion chromatography -inductively coupled plasma dynamic reaction cell mass spectrometer. Anal. Chim. Acta 590, 239-244 (2007)... 

Speciation analysis of arsenic and selenium is veiyo active in the recent literature. The toxicity of arsenic varies widely and is dependent on the specific compounc present. Arsenic in its various forms is also widely distributed in the environment and the food that human eats. Speciation of arsenic in human depends both on th J... 

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