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The Analytical Scientist / Issues / 2022 / Dec / Speedy Dilute-and-Shoot
Chromatography Gas Chromatography Mass Spectrometry Cannabis Science

Speedy Dilute-and-Shoot

Liquid chromatography-tandem mass spectrometry assay rapidly quantifies cannabis metabolites in human urine

By Margot Lespade 12/12/2022 1 min read

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With cannabis one of the most commonly used psychoactive substances, researchers are constantly looking for new testing methods. In a recent study, researchers from the University of Rochester Medical Center, New York, USA, have developed a liquid chromatography-tandem mass spectrometry assay that quantifies cannabis metabolites THC-COOH and THC-COO in human urine.

The assay uses a direct “dilute-and-shoot” approach – in which urine samples are diluted 10 times before being directly injected onto the liquid chromatography and mass spectrometer – to simplify the sample preparation process and improve overall throughput. The turnaround time was five minutes, a significant improvement over existing dilute-and-shoot assays – that typically take 20 minutes.
 

Image Credit : Girl with red hat / Unsplash.com

One potential challenge of a direct dilute-and-shoot approach are matrix effects and ion suppression because of the limited sample cleanup; however, results indicated that the assay was minimally affected. 

According to the authors, the method also has a wide linear range – reducing the need for sample dilution and reanalysis. “This method can be easily implemented and has great potential to be routinely performed in any high-throughput clinical laboratory setting,” the authors wrote (1).

Image Credit : Girl with red hat / Unsplash.com

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References

  1. BL Young, YV Zhang, J Chromatogr B Analyt Technol Biomed Life Sci, 1211, 123495 (2022). DOI: 10.1016/j.jchromb.2022.123495.

About the Author(s)

Margot Lespade

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