A solid colorimetric sensor for the analysis of amphetamine-like street samples
GC–MS differentiation of the six regioisomericdimethoxybenzoyl-1-pentylindoles: Isomeric cannabinoid substances
A solid sensor obtained by embedding 1,2-naphthoquinone-4-sulfonate (NQS) into polydimethylsiloxane/
tetraethylortosilicate/silicon dioxide nanoparticles composite has been developed to
identify and determine amphetamine (AMP), methamphetamine (MAMP), 3,4-
methylenedioxymetamphetamine (MDMA) and 3,4-methylenedioxyamphetamine (MDA). The analytes
are derivatized inside the composite for 10 min to create a colored product which can be then quantified
by measuring the diffuse reflectance or the color intensity after processing the digitalized image.
Satisfactory limits of detection (0.002e0.005 g mL1) and relative standard deviations (