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http://dx.doi.org/10.5806/AST.2014.27.2.92

Quantification of seleno proteins in Korean blood serum using solid phase extraction and affinity chromatography-inductively coupled plasma/mass spectrometry  

Ahn, Ji-Yun (Department of Chemistry Education, Korea National University of Education)
Kwon, Hyo-Sik (Department of Chemistry Education, Chung-Buk National University)
Pak, Yong-Nam (Department of Chemistry Education, Korea National University of Education)
Publication Information
Analytical Science and Technology / v.27, no.2, 2014 , pp. 92-99 More about this Journal
Abstract
Interferences were removed using anion exchange solid phase extraction (AE SPE) in quantification of selenoproteins in Korean human blood serum with affinity high performance liquid chromatography (AF HPLC)-inductively coupled plasma/mass spectrometry (ICP/MS). The average selenium level obtained for healthy Koreans was $94.3{\pm}2.3ngg^{-1}$ using isotope dilution method. AE SPE was coupled to AF column to separate 3 selenoproteins, glutathione peroxidase GPx, selenoprotein SelP, and selenoalbumin SeAlb. Post column isotope dilution was employed to quantify the proteins. The certified reference material of human blood serum BCR-637 was analyzed to give total selenoprotein concentration of $85.4{\pm}3.4ngg^{-1}$, which agreed well with the reference value of $81{\pm}7ngg^{-1}$. The pooled concentration of GPx, SelP, and SeAlb from healthy Koreans (n=20) was $12.1{\pm}1.4ngg^{-1}$, $57.2{\pm}2.0ngg^{-1}$, and $20.0{\pm}1.9ngg^{-1}$, respectively. The sum of selenoproteins is $89.3ngg^{-1}$, which is about the same as the total selenium concentration of $94.3ngg^{-1}$. The fact suggests that selenium in blood serum is mostly consisted of selenoproteins. After the removal of interference, GPx showed a significant decrease (more than 50%) from $25.0ngg^{-1}$ to $12.1ngg^{-1}$. It was identified that the interference in blood serum was mostly from GPx and the use of AE SPE was proven to be efficient in eliminating Cl and Br that cause interference to GPx.
Keywords
Korean blood serum; AF HPLC-ICP/MS; selenoproteins; GPx; SelP; SeAlb; solid phase extraction;
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