title: [Determination of selenium species in food by high performance liquid chromatography with inductively coupled plasma mass spectrometry].
abstract: An analytical method for selenium species of selenate (SeVI), selenite (SeIV), selenomethionine (SeMet), selenocystine (SeCys2 ) and selenoethionine (SeEt) was established using high performance liquid chromatography with inductively coupled plasma mass spectrometry (HPLC-ICP-MS). A Hamilton PRP X-100 reversed-phase anion exchange column (250 mm x 4.6 mm, 5 microm) with a 5 mmol/L citric acid buffer solution (pH 4.5, adjusted with 20% (v/ v) ammonia) as mobile phase was used for separation, and ICP-MS was used for detection. The five species were completely separated within 21 min. All the linear correlation coefficients of the five selenium species were greater than 0.999 5, and the detection limits of SeVI, SeIV, SeMet, SeCys2, SeEt were 0.4, 0.4, 5.6, 0.9 and 1.2 microg/L, respectively. The extraction procedure was studied for fresh mushroom and pork samples. For water-soluble selenium compounds, citric acid was a good extraction solution, and the recoveries were around 100% for inorganic selenium and in the range of 85.0% - 95.3% for SeMet; but worse for SeCys2 and SeEt. As for the proteinase K, the recoveries of SeCys2 and SeEt were raised to the range of 79.9% -91.5%. The method has the advantages of simple operation and good accuracy, and can be used for the quantitative determination of the five selenium species in food.
authors.affiliation: Shenzhen Entry-Exit Inspection and Quarantine Bureau, Shenzhen 518035, China.
authors.forename: Bingtao
authors.initials: B
authors.lastname: Wang
authors.forename: Liqi
authors.initials: L
authors.lastname: Xie
authors.forename: Yankui
authors.initials: Y
authors.lastname: Lin
authors.forename: Zhi
authors.initials: Z
authors.lastname: Yan
authors.forename: Louming
authors.initials: L
authors.lastname: Wang
mesh_terms: D000363:Agaricales / Q000737:chemistry; D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D002852:Chromatography, Ion Exchange / Q000379:methods; D005504:Food Analysis / Q000379:methods*; D013058:Mass Spectrometry / Q000379:methods*; D008460:Meat / Q000032:analysis; D016566:Organoselenium Compounds / Q000737:chemistry / Q000302:isolation & purification*; D012643:Selenium / Q000032:analysis / Q000737:chemistry*; D018036:Selenium Compounds / Q000737:chemistry / Q000302:isolation & purification*; D013552:Swine
chemical_list: D016566:Organoselenium Compounds; D018036:Selenium Compounds; D012643:Selenium