Journal
TALANTA
Volume 84, Issue 3, Pages 983-988Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2011.03.004
Keywords
Speciation analysis; Selenium; CE-ICP-MS; Capillary electrophoresis
Categories
Funding
- National Nature Sciences Funding of China [40875087]
- Ministry of Health P.R. China [200902009]
- Fujian Provincial Department of Science and Technology [2010H6010, 2009J01026]
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An enzyme-assisted extraction used to extract all species of selenium in rice sample and a sensitive analytical method for the determination of ultratrace Se(VI), Se(IV), SeCys(2) (selenocystine) and SeMet (selenomethionine) with capillary electrophoresis-inductively coupled plasma mass spectrometry were firstly described in this study. The extraction method is simple, effective and can be used to extract trace selenium compounds in rice with high extraction efficiency and no altering its species. The analytical method has a detection limit of 0.1-0.9ngSe/mL, and can be used to determine trace Se(VI), Se(IV), SeCys(2) and SeMet in rice directly without any derivatization and pre-concentration. With the help of above methods, we have successfully determined Se(VI), Se(IV), SeCys(2) and SeMet in selenium-enriched rice within 18min with a recovery of 90-103% and a RSD (relative standard deviation, n=6) of 3-7%. Our results indicated that selenium-enriched rice contained only one species of selenium, SeMet, and its concentration is in range of 0.136-0.143 mu gSe/g dried weight. The proposed method providing a realistic approach for the nutritional and toxical evaluation of different selenium compounds in nutritional supplements. (C) 2011 Elsevier B.V. All rights reserved.
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