Estudo do teste de Scott via técnicas espectroscópicas: um método alternativo para diferenciar cloridrato de cocaína e seus adulterantes

Cocaine is usually seized mixed with a wide variety of adulterants such as benzocaine, lidocaine, caffeine, and procaine. The forensic identification of cocaine in these street drug mixtures is normally performed using colorimetric testing kits, but these tests may suffer from interferences, produci...

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Bibliographic Details
Published in:Química Nova 2014-01, Vol.37 (9), p.1538-1544
Main Authors: Vitor N. Conceição, Lindamara M. Souza, Bianca B. Merlo, Paulo R. Filgueiras, Ronei J. Poppi, Wanderson Romão
Format: Article
Language:English
Subjects:
ATR-FTIR
cocaine
colorimetric test
PLS
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Summary:Cocaine is usually seized mixed with a wide variety of adulterants such as benzocaine, lidocaine, caffeine, and procaine. The forensic identification of cocaine in these street drug mixtures is normally performed using colorimetric testing kits, but these tests may suffer from interferences, producing false-positive results. Here, we describe the use of analytical techniques including attenuated total reflection Fourier transform infrared (ATR-FTIR) and ultraviolet-visible (UV-VIS) spectroscopies to distinguish between cocaine and other adulterants (lidocaine, promethazine, powdered milk and yeast) that yield positive results on the Scott test using the thiocyanate cobalt reagent. A further 13 substances were also analyzed using the Scott test.
ISSN:1678-7064
DOI:10.5935/0100-4042.20140240