Coupling laser desorption with gas chromatography and ion mobility spectrometry for improved olive oil characterisation
Coupling laser desorption with gas chromatography and ion mobility spectrometry for improved olive oil characterisation
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DOI：
10.1016/j.foodchem.2018.01.193
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发表时间：
2018-07-30
期刊：
影响因子：
8.8
通讯作者：
Vautz, Wolfgang
中科院分区：
文献类型：
--
作者：
Liedtke, Sascha;Seifert, Luzia;Vautz, Wolfgang
液体样品顶空中挥发性化合物的研究通常可用于样品的详细和非破坏性表征。这对于过程控制或食品样品（如橄榄油）的表征具有很大的潜力。我们调查了，第一次，从橄榄油液滴中释放的物质的羽流激光解吸的可行性研究和应用离子迁移谱耦合到快速GC预分离，以提高选择性。我们的研究表明，通过激光解吸可以检测和定量的物质比通常的顶空多得多，能够对样品进行快速（5-10分钟），灵敏（低ng/g范围）和全面的分析，具有质量控制和欺诈识别的潜力。因此，激光解吸提供了一个有用的采样工具，在许多应用中表征液体，只需要几μ L的样品。
The investigation of volatile compounds in the headspace of liquid samples can often be used for detailed and non-destructive characterisation of the sample. This has great potential for process control or the characterisation of food samples, such as olive oil. We investigated, for the first time, the plume of substances released from olive oil droplets by laser desorption in a feasibility study and applied ion mobility spectrometry coupled to rapid GC pre-separation to enhance selectivity. Our investigation demonstrated that significantly more substances can be detected and quantified via laser desorption than in the usual headspace, enabling a rapid (5-10 min), sensitive (low ng/g range) and comprehensive analysis of the sample, with the potential for quality control and fraud identification. Therefore, laser desorption provides a useful sampling tool for characterising liquids in many applications, requiring only a few mu L of sample.