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The identification of 4-methylamphetamine and its synthesis by-products in forensic samples
John D Power1, Karen Clarke, Seán D McDermott
1Forensic Science Laboratory, Garda HQ, Dublin 8, Ireland. jdpower@fsl.gov.ie
Abstract:
During the analysis of street samples for the suspected presence of controlled drugs, two samples were found to contain 4-methylamphetamine (4-MA). This is the first report of the drug in Ireland as previously only N-methylamphetamine (N-MA) had been encountered. In Ireland, little attention had previously been paid to the possible presence of the isomeric forms of methylamphetamine in submitted samples. Two street level samples were analyzed and the presence of 4-MA was confirmed in both, the other major components of these samples were examined to establish the possible synthetic route employed. The identification of a single synthetic route which accounted for the major components found in the street samples has implications for previously thought route specific analogous compounds of 4-MA. The three ring substituted isomers of methylamphetamine, namely 2-, 3- and 4-MA, were synthesized and characterized by GCMS, HR-ESIMS, NMR and IR for use as reference standards.
Insights
This study reports the first detection of 4-methylamphetamine (4-MA) in Ireland, identified in two street drug samples. The findings highlight the need to consider isomeric forms of methylamphetamine in forensic analysis.
Area of Science:
- Forensic Chemistry
- Analytical Chemistry
- Organic Chemistry
Background:
- Limited attention has been given to isomeric methylamphetamine forms in Ireland.
- Previous forensic analyses in Ireland primarily identified N-methylamphetamine (N-MA).
Purpose of the Study:
- To report the first identification of 4-methylamphetamine (4-MA) in street samples in Ireland.
- To investigate the synthetic route of 4-MA based on co-occurring compounds in street samples.
- To synthesize and characterize 4-MA isomers for use as reference standards.
Main Methods:
- Gas Chromatography-Mass Spectrometry (GCMS) for sample analysis.
- High-Resolution Electrospray Ionization Mass Spectrometry (HR-ESIMS) for characterization.
- Nuclear Magnetic Resonance (NMR) and Infrared (IR) spectroscopy for structural elucidation.
- Synthesis of 2-, 3-, and 4-methylamphetamine isomers.
Main Results:
- 4-methylamphetamine (4-MA) was confirmed in two street-level drug samples.
- A single synthetic route was identified that explained the major components in the analyzed samples.
- The synthesized 4-MA isomers were characterized using advanced analytical techniques.
Conclusions:
- The presence of 4-MA in Ireland necessitates broader forensic screening for methylamphetamine isomers.
- The identified synthetic route has implications for understanding the production of related designer drugs.
- Availability of characterized reference standards is crucial for accurate forensic identification.
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