A solid colorimetric sensor for the analysis of amphetamine-like street samples

Area of Science:

• Analytical Chemistry
• Materials Science
• Forensic Science

Background:

• Illicit drug detection remains a critical challenge in forensic science.
• Existing methods for amphetamine-type stimulants (ATS) analysis can be complex, time-consuming, and require specialized equipment.
• Development of rapid, portable, and cost-effective screening tools is essential for field applications.

Purpose of the Study:

• To develop a novel solid-state sensor for the identification and quantification of amphetamine (AMP), methamphetamine (MAMP), 3,4-methylenedioxymetamphetamine (MDMA), and 3,4-methylenedioxyamphetamine (MDA).
• To create a simple, portable, and low-cost kit for in-situ screening of these illicit drugs.

Main Methods:

• A composite material was synthesized by embedding 1,2-naphthoquinone-4-sulfonate (NQS) into a polydimethylsiloxane/tetraethylortosilicate/silicon dioxide nanoparticle matrix.
• Analyte derivatization within the composite for 10 minutes to produce a colored product.
• Quantification using diffuse reflectance measurements or color intensity analysis of digitalized images.

Main Results:

• Achieved satisfactory limits of detection ranging from 0.002 to 0.005 g mL⁻¹.
• Demonstrated good precision with relative standard deviations below 10%.
• Successfully validated the sensor kit and applied it to real street drug samples.

Conclusions:

• The developed NQS-embedded composite sensor provides a simple, rapid, and portable method for the in-situ screening of AMP, MAMP, MDMA, and MDA.
• The sensor exhibits excellent stability and a very low cost, making it suitable for field analysis.
• This technology offers a promising solution for the preliminary identification of amphetamine-like drugs in various settings.