Published:Journal of Chromatographic Science, ISSN 0021-9665Volume 40, Number 3, March 2002, pp. 147-155

Identification of Odor Signature Chemicals in Cocaine Using Solid-Phase Microextraction– Gas Chromatography and Detector-Dog Response to Isolated Compounds Spiked on U.S. Paper Currency

Kenneth G. Furton, Yi-cheng Hong, Ya-Li Hsu, Tianying Luo, Stefan Rose, and John Walton
Department of Chemistry and the International Forensic Research Institute (IFRI), Florida International University, University Park, Miami, FL 33199

Solid-phase microextraction (SPME) combined with gas chromatography (GC) is optimized and applied to the analysis of street-cocaine samples followed by the field-testing of isolated chemicals using certified detector dogs. SPME proves to be a very sensitive and rapid method for isolating odor chemicals from street-cocaine samples. SPME–GC and activated charcoal strip (ACS)–SPME–GC signature profile methods are developed for the detection and quantitation of cocaine-odor chemicals, including the optimization of controllable variables such as fiber chemistry, extraction time, and desorption time. The volatile odor chemicals in representative illicit cocaine samples are identified and quantitated by the ACS–SPME–GC signature profile method and direct injection. Field tests with drug detector dogs show methyl benzoate to be the dominant signature odor chemical along with cocaine on U.S. currency at a threshold level of approximately 1–10 µg when spiked or when 10 ng/s methyl benzoate is diffused from polymer bottles, which is required in order to initiate an alert. No other substance studied initiated consistent responses by the drug dogs. The results indicate that the microgram levels of cocaine that have been reported on circulated U.S. currency are insufficient to signal an alert from law-enforcement trained drug detector dogs.

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