Comprehensive Data Evaluation Methods Used in Developing the SWGDRUG Mass Spectral Reference Library for Seized Drug...

Area of Science:

• Forensic Chemistry
• Analytical Chemistry
• Mass Spectrometry

Background:

• The Scientific Working Group for the Analysis of Seized Drugs (SWGDRUG) mass spectral library is a crucial resource for forensic analysis.
• Accurate identification of seized drugs, metabolites, and related compounds is vital for law enforcement and public health.

Purpose of the Study:

• To describe the SWGDRUG mass spectral library (version 3.13) and its comprehensive evaluation process.
• To highlight the methods used to ensure the reliability and accuracy of spectral data for forensic applications.

Main Methods:

• Utilizing gas chromatography/mass spectrometry (GC/MS) for spectral acquisition.
• Employing NIST MS Interpreter and NIST Artificial Intelligence Retention Indices (AIRI) software for spectral verification and compound confirmation.
• Cross-referencing spectra against six distinct libraries using three search methods to validate data quality.

Main Results:

• The SWGDRUG library (version 3.13) contains 3598 validated spectra.
• New evaluation methods enhance the confirmation of chemical information, product ions, and compound identity.
• Low-quality or incorrect spectra are systematically rejected, ensuring library integrity.

Conclusions:

• The SWGDRUG mass spectral library provides a highly reliable and comprehensive resource for forensic drug analysis.
• Advanced software tools and rigorous cross-validation methods ensure the accuracy of the spectral data.
• The continuous improvement of evaluation methods guarantees the ongoing quality and utility of the library for forensic scientists.