ArticleRSC advances2025
Photochemically-made gold nanorods for adsorption and SERS detection of cocaine and benzoylecgonine in latent fingerprints.
Article in RSC advances, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors.
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Abstract
Detection of illegal drugs in fingermarks is a routine activity of the scientific police and it can be better carried out with the help of more sensitive and faster analytical tools. In this regard, this contribution proposes and tests a SERS-based method for the rapid detection of cocaine hydrochloride (COC) in latent fingerprints (LFP) using photochemically-made CTAB-coated gold nanorods (AuNRs) as SERS-active substrates. As a key point, removal of excessive CTAB from the AuNR colloids is essential to achieve the largest Raman signal enhancement. The method is capable of detecting COC in dried solutions (∼1 nM) and in either male or female COC-doped LFPs (∼60 µM). The latter corresponds to ∼300 ng, which falls within the range reported for COC excreted through sweat. The method was also tested for its predominant metabolite, benzoylecgonine (BENZ), which exhibited a similar performance. Adsorption of analytes on AuNRs was investigated with the aid of different isotherm models. Freundlich and Frumkin models were the best and revealed that COC and BENZ are equally physiosorbed (Δ
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