液相色谱/线性离子阱-静电场轨道阱高分辨质谱法快速筛查葡萄酒中的合成色素

基于液相色谱/线性离子阱-静电场轨道阱高分辨质谱(LC/LTQ-orbitrap MS)技术构建了合成色素的质谱数据库,利用精确质量数和该数据库中二级质谱图的匹配度分析筛查,建立了葡萄酒中15种水溶性合成色素的快速筛查方法。葡萄酒样品通过弱阴离子交换柱进行净化后经苯基色谱柱分离,然后用LTQ-orbitrap MS对样品中的色素进行筛查和定量检测。结果显示,葡萄酒中15种色素的检出限在0.00040~0.18 mg/L之间,3个加标水平的回收率在43.1%~127%之间,平均相对标准偏差均小于10%。加标样品的二级质谱图与数据库中标准样品二级质谱图的匹配度均达到98%以上。该方法可在无标准物质的情况下对葡萄酒中的15种合成色素进行筛查检测。

Fast screening of the artificial dyes in wine by liquid chromatography/hybrid linear ion trap-orbitrap mass spectrometry

A fast screening method was established for the simultaneous determination of 15 water-soluble artificial dyes in wine by liquid chromatography/hybrid linear ion trap orbitrap mass spectrometry (LC/LTQ-orbitrap MS) based on a self-established mass spectral database. The confirmations of these target dyes were processed by the accurate mass numbers, and the MS² spectra marching to the self-established mass spectral database. The dyes in wine were purified by an anion-exchange column and separated by a BEH Phenyl column, then identified and quantified by LTQ-orbitrap MS. The results showed that the method detection limits of the target compounds were ranged from 0.00040 to 0.18 mg/L, and the average recoveries of the 15 compounds spiked at three concentrations were in the range of 43.1%-127% with the relative standard deviations less than 10%. The spiked sample had the matching scores higher than 98% to the second order mass spectra of the standard compounds in the database. The method is also suitable for screening the 15 dyes in wine without reference standards.