Volume 49, Issue 3 (May 2004)

    Evaluation of 5-(4-Nitrophenyl)-2,4-pentadien-1-al (NPPD)as a Tracer for Shadowing Pursuits

    (Received 28 October 2003; accepted 16 January 2004)

    Published Online: March

    CODEN: JFSOAD

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    Abstract

    The chemical compound 5-(4-Nitrophenyl)-2,4-pentadien-1-al (NPPD), called “spy dust”, was usedin the Soviet Union as a shadowing pursuit, the act of following someone secretly, for investigating the activities of diplomatic personnel. It is also useful for counter-terrorism, and some criminal cases in the forensic science field. In this paper, it was synthesized and evaluated as a tracer for shadowing pursuits. The method for utilizing this reagent was very simple: it was dissolved in methanol (1 mg/mL) and sprayed on the restricted area. If the suspect was to enter this area or touched the sprayed material, NPPD was attached to the suspect's shoe surface or hands. The color examination was a two-steps process: first was the addition of 1 mL of a 0.1% naphthoresorcinol methanol solution to the methanol extracts of a methanol-contained cotton swab used to smear some surfaces of the suspect, and second, the addition of 1 mL of concentrated hydrochloric acid, which turned the solution dark red. The λmax of the colored solution was 510 nm, measured by ultraviolet-vis spectroscopy. Detection limits for three methods were determined: a visual method (detection limit 100 ng/3 mL), an ultraviolet-visible spectrometric method (detection limit 10 ng/3 mL), and a selected-ion-monitoring gas chromatographic/mass spectrometric method (detection limit 300 pg/injection). The forensic utility of NPPD was demonstrated for two simulated cases: a theft case and a case where NPPD was used as a tracer to prove that an automobile had entered a restricted area.

    These examinations prove NPPD is a useful shadowing pursuit (spy dust) for the forensic science field.


    Author Information:

    Ohta, H
    National Research Institute of Police Science, Kashiwa-shi, Chiba

    Kasamatsu, M
    National Research Institute of Police Science, Kashiwa-shi, Chiba

    Sugita, R
    National Research Institute of Police Science, Kashiwa-shi, Chiba

    Suzuki, S
    National Research Institute of Police Science, Kashiwa-shi, Chiba

    Marumo, Y
    National Research Institute of Police Science, Kashiwa-shi, Chiba

    Suzuki, Y
    National Research Institute of Police Science, Kashiwa-shi, Chiba


    Stock #: JFS2003360

    ISSN: 0022-1198

    DOI: 10.1520/JFS2003360

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    Title Evaluation of 5-(4-Nitrophenyl)-2,4-pentadien-1-al (NPPD)as a Tracer for Shadowing Pursuits
    Symposium , 0000-00-00
    Committee E30