Textile fiber is a common form of transferable trace evidence at the crime scene. Various techniques, such as microscopy or spectroscopy, are currently being used for trace fiber analysis. Dye characterization in trace fiber adds an important molecular specificity during the analysis. In the current study, the MFD system used an in-house made automated procedure that requires only 10 microliter of organic solvent for the extraction. The system's total extraction and identification time is under 12 min. A variety of sulfonated azo and anthraquinone dyes were analyzed from 1 mm length nylon fiber samples. This methodology successfully characterized multiple dyes (greater than or equal to 3 dyes) from a single fiber thread. In addition, it was possible to do dye characterization from single fibers with a diameter of 10 microliter. The MFD-MS system was used for elemental composition and isotopic distribution analysis where MFD-MS/MS was used for structural characterization of dyes on fibers. (publisher abstract modified)
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