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. 2011 Jul 13;3(3):425–439. doi: 10.3390/pharmaceutics3030425

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© 2011 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 9. — SERS of (a) 50 ng/mL cocaine in saliva as an unknown, (b) 0.1 mg/mL cocaine in the spectral library, and (c) ethylbenzoylecgonine as the second best match in the spectral library. The HQI scores were (b) 0.287 and (c) 0.348. Conditions as in Figure 4, except at indicated concentrations.