南极磷虾油中总砷含量及砷形态分析
发布时间:2018-06-27 08:27
本文选题:南极磷虾油 + 砷 ; 参考:《分析化学》2016年05期
【摘要】:南极磷虾油富含Omega-3磷脂而具有强大的保健功能,但由于其砷含量较高,在保健品领域的应用受到一定限制。由于南极磷虾油中含有大量的磷脂质,采用常规的提取方法分析难以对其砷形态进行准确定量分析。本研究采用高效液相色谱-电感耦合等离子体质谱((HPLC-ICP-MS)联用技术建立了针对砷甜菜碱(As B)、二甲基砷酸(DMA)、一甲基砷酸(MMA)、三价砷As(Ⅲ)、五价砷As(Ⅴ)5种砷形态的分析方法。采用C_(18)固相萃取进行样品脱脂前处理,采用阴离子交换色谱Ion Pac AS9-H阴离子分析柱(250 mm×4 mm),流动相采用38 mmol/L Na_2SO_4+15 mmol/L乙酸钠;流速0.6 m L/min,流速1 m L/min,进行5种形态砷化合物的分析。结果表明,5种砷化合物的线性范围为0.5~500μg/L,相关系数R0.9993.检出限(LOD)为0.1~0.2μg/L,定量限(LOQ)为1.5~2.6μg/L,RSD5%。加标回收率为88.9%~106.3%。样品的测定结果显示,南极磷虾油中砷形态的主要存在形式为无毒的砷甜菜碱,因此可以安全地应用于食品及保健品。
[Abstract]:Antarctic krill oil is rich in Omega-3 phospholipids and has powerful health care function, but its application in the field of health products is limited due to its high arsenic content. Due to the large amount of phospholipid in Antarctic krill oil, it is difficult to analyze the arsenic species accurately by conventional extraction method. High performance liquid chromatography-inductively coupled plasma-mass spectrometry (HPLC-ICP-MS) was used to determine the arsenic speciation of arsenic betaine (as B), dimethyl arsenic acid (DMA), monomethylarsenic acid (MMA), trivalent arsenic as (鈪,
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