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首页> 外文期刊>Journal of mass spectrometry: JMS >Positive and negative-mode laser desorption/ionization-mass spectrometry (LDI-MS) for the detection of indigoids in archaeological purple
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Positive and negative-mode laser desorption/ionization-mass spectrometry (LDI-MS) for the detection of indigoids in archaeological purple

机译：正负激光解吸/电离质谱（LDI-MS）用于检测考古紫色中的靛蓝

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摘要

Laser-based ionization techniques have demonstrated to be a valuable analytical tool to study organic pigments by mass spectrometric analyses. Though laser-based ionization techniques have identified several natural and synthetic organic dyes and pigments, they have never been used in the characterization of purple. In this work, positive and negative-mode laser desorption/ionization mass spectrometry (LDI-MS) was used for the first time to detect indigoids in shellfish purple. The method was used to study organic residues collected from archaeological ceramic fragments that were known to contain purple, as determined by a classical high-performance liquid chromatography-based procedure. LDI-MS provides a mass spectral fingerprint of shellfish purple, and it was found to be a rapid and successful tool for the identification of purple. In addition, a comparison between positive and negative mode ionization highlighted the complementarity of the two ionization modes. On the one hand, the negative-ion mode LDI-MS showed a better selectivity and sensitivity to brominated molecules, such as 6,6'-dibromoindigo, 6-monobromoindigo, 6,6'-dibromoindirubin, 6- and 6'-monobromoindirubin, thanks to their electronegativity, and produced simpler mass spectra. On the other hand, negative-ion mode LDI-MS was found to have a lower sensitivity to non-brominated compounds, such as indigo and indirubin, whose presence can be established in any case by collecting the complementary positive-ion LDI mass spectrum.
机译：基于激光的电离技术已被证明是通过质谱分析研究有机颜料的有价值的分析工具。尽管基于激光的电离技术已经鉴定出几种天然和合成的有机染料和颜料，但它们从未用于紫色的表征中。在这项工作中，正负激光解吸/电离质谱（LDI-MS）首次用于检测贝类紫色中的靛类。该方法用于研究从已知包含紫色的考古陶瓷碎片中收集的有机残留物，这是通过经典的基于高效液相色谱的方法确定的。 LDI-MS提供了贝类紫色的质谱指纹图，发现它是鉴定紫色的快速而成功的工具。此外，正负电离模式之间的比较突出了两种电离模式的互补性。一方面，负离子模式LDI-MS对溴化分子（例如6,6'-二溴靛蓝，6,6'-二溴靛红，6和6'-单溴靛红）表现出更好的选择性和敏感性。 ，由于它们具有负电性，因此产生的质谱更简单。另一方面，发现负离子模式LDI-MS对非溴化化合物（如靛蓝和靛玉红）的敏感性较低，在任何情况下均可通过收集互补的正离子LDI质谱来确定其存在。

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