Drugs at your fingertips


An international team of scientists has developed a new glove-based sensor for detecting cocaine quickly and easily. The device could benefit security staff in ports and airports who need on-the-spot results.

Building the fingertip sensor into a wearable nitrile glove makes it easy to use

The researchers, led by Karolien De Wael at the University of Antwerp in Belgium, and Joseph Wang at the University of California in the US, have expanded the horizons of their forensic finger technology for detecting explosives with their new target: illegal drugs. Their sensor can screen suspicious powders on-site and works for cocaine, as well as cutting agents, including caffeine and paracetamol. The tester wearing the glove touches the sample with their index finger, before rubbing the powder into a gel on their thumb, which connects the circuit and produces the results as an electrochemical signal.

The group tested authentic street cocaine samples provided by the National Institute of Criminalistics and Criminology (NICC) in Belgium that were found to contain between 30–76% cocaine mixed with other white powders such as boric acid and lidocaine.

Traditional cocaine screening methods rely on cobalt thiocyanate-based colour-change tests, which suffer from poor selectivity and require complicated and expensive laboratory techniques such as GC–MS to confirm the results. This new technique has a significantly lower limit of detection than both colour screening tests and the accredited GC–MS technique used by the NICC. 

References

This paper is open access

M de Jong et al, Chem. Sci., 2016, DOI: 10.1039/c5sc04309c


Related Content

Cocaine users sweat over fingerprint analysis

19 May 2015 Research

news image

Surface mass spectrometry quickly detects cocaine metabolites in fingerprints

Extent of Massachusetts lab’s forensics failure revealed

13 May 2016 News and Analysis

news image

State chemist stole from reference standards to feed a habit, raising doubts over thousands of criminal cases

Most Commented

Sweet tear sensor could ease pain of diabetes

29 June 2016 Research

news image

New non-invasive sensor could check blood glucose levels using tears

The next generation

24 June 2016 Premium contentFeature

news image

Elinor Hughes catches up with some of the latest materials and processes in photovoltaics research