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Direct Analysis of Textile Fabrics and Dyes Using IR Matrix-Assisted Laser Desorption Electrospray Ionization (MALDESI) Mass Spectrometry

机译:纺织面料及染料使用IR基质辅助激光解吸电喷雾电离(maLDEsI)质谱直接分析

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摘要

The forensic analysis of textile fibers uses a variety of techniques from microscopy to spectroscopy. One such technique that is often used to identify the dye(s) within the fiber is mass spectrometry (MS). In the traditional MS method, the dye must be extracted from the fabric and the dye components are separated by chromatography prior to mass spectrometric analysis. Direct analysis of the dye from the fabric allows the omission of the lengthy sample preparation involved in extraction, thereby significantly reducing the overall analysis time. Herein, a direct analysis of dyed textile fabric was performed using the infrared matrix-assisted laser desorption electrospray ionization (IR-MALDESI) source for MS. In MALDESI, an IR laser with wavelength tuned to 2.94 μm is used to desorb the dye from the fabric sample with the aid of water as the matrix. The desorbed dye molecules are then post-ionized by electrospray ionization (ESI). A variety of dye classes were analyzed from various fabrics with little to no sample preparation allowing for the identification of the dye mass and in some cases the fiber polymer. Those dyes that were not detected using MALDESI were also not observed by direct infusion ESI of the dye standard.
机译:纺织纤维的法医分析使用从显微镜到光谱的各种技术。质谱(MS)是一种经常用于识别纤维内染料的技术。在传统的MS方法中,必须从织物中提取染料,并在进行质谱分析之前通过色谱法分离染料成分。对织物中染料的直接分析可以省去提取过程中冗长的样品,从而大大减少了总体分析时间。本文中,使用MS的红外矩阵辅助激光解吸电喷雾电离(IR-MALDESI)源对染色的织物进行了直接分析。在MALDESI中,使用波长调整为2.94μm的红外激光,以水为基质,从织物样品中解吸染料。然后通过电喷雾电离(ESI)将解吸的染料分子后电离。从几乎没有样品制备到几乎没有样品制备的各种织物中分析了各种染料类别,从而可以识别染料质量,在某些情况下还可以识别纤维聚合物。直接注入ESI染料标准液也未观察到那些未使用MALDESI检测到的染料。

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