[关键词]
[摘要]
本文研究建立了高效液相色谱-电感耦合等离子体质谱(HPLC-ICP-MS)联用检测转基因大豆中的硒酸盐(SeVI)、亚硒酸盐(SeIV)、硒代蛋氨酸(selenomethionine,SeMet)、硒代胱氨酸(selenocystine,SeCys2)和硒代乙硫氨酸(selenoethionine,SeEt)的方法。探讨了色谱柱、流动相及其酸度对分离效果的影响,使用10 mmol/L的柠檬酸溶液(pH值4.5)作流动相,Hamilton PRP X-100色谱柱分离,碰撞反应池技术消除40Ar40Ar+和40Ar2H2+等多原子离子干扰,ICP-MS检测82Se同位素,在21 min内可完全分离检测5种硒形态。探讨了不同提取方法的提取效果,优化了提取条件,采用蛋白酶提取,针对美国进口的转基因大豆样品进行加标回收实验,结果表明采用蛋白酶提取,SeIV和SeVI的回收率在100%左右,SeMet的回收率在92.6%~109.3%之间,SeCys2和SeEt的回收率为81.2%~95.9%。该方法可完全满足转基因大豆中的硒形态定量分析鉴定。
[Key word]
[Abstract]
An analytical method to detect selenium species such as selenate [Se(IV)], selenite [Se(VI)], selenomethionine (SeMet), selenocystine (SeCys2), and selenoethionine (SeEt) in genetically modified soybean was established using high-performance liquid chromatography coupled with inductively coupled plasma mass spectrometry (HPLC-ICP-MS). The effects of the chromatographic column, mobile phase, and acidity on separation were evaluated. Hamilton PRP X-100 reversed phase anion exchange column with 10 mmol/L citric acid solution as the mobile phase was used for separation. Collision cell technology was adopted to eliminate the interference of polyatomic ions such as 40Ar40Ar+ and 40Ar2H2+. Isotope 82Se was detected by ICP-MS. The five species were completely separated within 21 min. The extraction procedure was discussed and optimized. A spiked recovery experiment was carried out with proteinase extration, using genetically modified soybean imported from the USA. The result showed that the recoveries were around 100% for Se(IV) and Se(VI), was in the range 92.6%–109.3% for SeMet, and they were in the range 81.2%–95.9% for SeCys2 and SeEt. This method can be used for the quantitative determination of selenium species in genetically modified soybeans.
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[基金项目]
深圳出入境检验检疫局科技项目(SZ2008011)