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http://dx.doi.org/10.5806/AST.2013.26.3.182

Studies of separation and quantitation for selenium species in food  

Jang, Hee-Young (Department of Chemistry Education, Korea National University of Education)
Min, Hyungsik (Division of Metrology for Quality of Life, Korea Research Institute of Standards and Science)
Lee, Jonghae (Division of Metrology for Quality of Life, Korea Research Institute of Standards and Science)
Pak, Yong-Nam (Department of Chemistry Education, Korea National University of Education)
Publication Information
Analytical Science and Technology / v.26, no.3, 2013 , pp. 182-189 More about this Journal
Abstract
The purpose of this research is to separate and quantitate selenium species in some food samples with HPLC-ICP-MS. Cation exchange chromatography showed efficient separation only for inorganic Se species while reversed phase ion pair chromatography showed good separation for both inorganic and organic Se species. $C_8$ column ($Symmetryshield^{TM}\;RP_8$, 3.5 ${\mu}m$, $4.6{\times}150$ mm) was used with optimum condition of 5% methanol mobile phase, 0.05% of nonafluorovaleric acid ion pairing reagent. Five standard Se species of Se(IV), Se(VI), SeCys(selenocystein), SeMet(selenomethionine) and Se-M-C(seleno methyl cystein) were separated successfully under the optimum condition (mobile phase; 5% methanol, ion-pairing reagent; 0.05% nonafluorovaleric acid, flow rate; 0.9 mL $min^{-1}$). To extract Se species, microwave assisted and enzyme-assisted extraction methods were studied. In enzyme-assisted extraction method, protease I for garlic, protease I plus trypsin for pork and mackerel, and protease XIV for tuna showed the best extraction efficiency. With the optimum condition for each sample, it was found that mostly inorganic Se, SeCys and SeMet are present in the sample studied ranging from few ${\mu}g$ $g^{-1}$ to few tens of ${\mu}g$ $g^{-1}$.
Keywords
Ion exchange chromatography; RP HPLC; ICP-MS; HPLC-ICP-MS; Se species; seleno amino acids;
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