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Analytical Chemistry
Cool Science

Improving Hair Testing For Drug Abuse

31 Aug 2020
- by Dr Alison Halliday

Microscopic picture (400x magnification) of roots of hair in human head skin. Hair follicles.

Forensic laboratories could benefit from a simple, robust new analytical method for the routine screening of hair samples for the presence of illicit drugs.

Establishing a person’s exposure to drugs is a crucial aspect of forensic testing. Traditionally, ‘toxicological screening’ has usually been performed on blood or urine samples. But in recent years, hair testing has become a well-established technique. As well as being easy to collect, hair samples can also provide information about a person’s historic exposure that can extend to several months beforehand.

Other the past few decades, remarkable advances in mass spectrometry has led to the technique becoming established as the gold standard in forensic hair analysis. However, the technology has not yet been widely adopted for the broad preliminary screening of samples, which is still largely based on antibody-based assays.

A New Instrumental Approach

In a new study, published in the Journal of Chromatography B, scientists test a novel mass spectrometry approach that was recently developed for the routine analysis of drugs of abuse applied to hair toxicological screening.1

The researchers carried out the new instrumental procedure based on UHPLC–Ion Trap-MS and involving a simple pre-treatment of hair samples in acid overnight followed by direct injection after neutralisation. In parallel, they analysed all samples using the routine mass spectrometry techniques that were already established in their laboratory. They found the new method had limits of detection ranging between 0.01 and 0.09 ng/mg of hair matrix for a panel of 16 drugs of abuse (except for MDA, morphine, 6–MAM and norketamine).

Good Analytical Performance

The researchers first tested 40 hair samples collected from volunteers with no history of drug abuse, detecting no false positives. They then moved on to assess 968 real hair samples from forensic cases, finding that the new method corresponded well with results obtained from the routine procedure in terms of positive and negative samples.

Finally, the researchers analysed 12 proficiency test samples, finding that the new method was not only limited to screening for common drugs of abuse but could also successfully test for new psychoactive substances, including fentanyls and cathinones. The team used an ELGA PURELAB® laboratory water purification system to obtain ultrapure water that they used in their experiments, minimising the risk of adding contaminants that might affect their results.

A Simple and Robust Technique

This study demonstrates the usefulness of a new mass spectrometry approach for qualitative toxicological screening applied to hair analysis in a routine context. The results show that is possible to obtain sensitive and reliable information using the procedure, which was confirmed using a validated testing method.

The accuracy of this analytical tool was further verified by analysing test samples that contained not only traditional narcotics but also some of the so-called new psychoactive substances. The system also proved to be very robust, showing no need for any repair even after as many as 5000 sample injections. The new procedure could provide forensic laboratories with a simple, robust high–throughput alternative to antibody-based tests for the preliminary broad toxicological screening of hair samples.

Why Choose ELGA LabWater?

At ELGA LabWater, our expert engineers, chemists and scientists are at the forefront of technological innovation. They continue to introduce game-changing features to the lab water market. 

 

Reference:

1. Musile. G. et al. A simple and robust method for broad range screening of hair samples for drugs of abuse using a high–throughput UHPLC–Ion Trap MS instrument. Journal of Chromatography B 2020; 1152:122263.

 

Dr Alison Halliday

After completing an undergraduate degree in Biochemistry & Genetics at Sheffield University, Alison was awarded a PhD in Human Molecular Genetics at the University of Newcastle. She carried out five years as a Senior Postdoctoral Research Fellow at UCL, investigating the genes involved in childhood obesity syndrome. Moving into science communications, she spent ten years at Cancer Research UK engaging the public about the charity’s work. She now specialises in writing about research across the life sciences, medicine and health.

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Highlights

22 Feb 2021
Challenges in the Purification of Drinking Water Part 2
15 Feb 2021
Challenges in the Purification of Drinking Water Part 1
8 Feb 2021
Exploring the Ancient Hair Proteome
25 Jan 2021
Could Hemp Seeds Provide A Natural Sleep Aid?
18 Jan 2021
Forensic Toxicological Analysis Of Cannabinoids In Blood
14 Dec 2020
Developing Batteries Powered by Human Urine 
23 Nov 2020
Improving the Treatment of Diabetic Foot Infections
16 Nov 2020
Does The Type Of Wine Fermentation Vessel Matter?

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