Absorptive stripping voltammetry for cannabis detection

Chemistry Central Journal

Rita Nissim¹  Richard G Compton¹ 

[1] Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, UK

关键词: Liquid-liquid interfaces;    Carbon paste electrode;    THC detection;    Cannabis detection;    Δ9-tetrahydrocannabinol;    Absorptive stripping voltammetry;   

Others  :  1219941
DOI  :  10.1186/s13065-015-0117-0

 received in 2015-03-27, accepted in 2015-06-19,  发布年份 2015

【 摘 要 】

Background

Given that Δ ⁹ -tetrahydrocannabinol, the active constituent of cannabis, has been shown to greatly reduce driving ability, thus being linked to many drug driving accidents, its reliable detection is of great importance.

Results

An optimised carbon paste electrode, fabricated from graphite powder and mineral oil, is utilised for the sensitive detection of Δ ⁹ -tetrahydrocannabinol (THC) in both aqueous solutions of pH 10.0 and in synthetic saliva solutions. “Absorptive Stripping Voltammetry” is exploited to that effect and the paste is used to pre-concentrate the carbon paste electrode with the target molecule. Practical limits of detection of 0.50 μM and 0.10 μM are determined for THC in stationary and stirred aqueous borate buffer solutions, respectively. Theoretical limits of detection are also calculated; values of 0.48 nM and 0.41 nM are determined for stationary and stirred THC aqueous borate buffer solutions, respectively. THC concentrations as low as 0.50 μM are detected in synthetic saliva solutions. The sensitivity of the sensor was 0.12 μA μM ⁻¹ , 0.84 μA μM ⁻¹and 0.067 μA μM ⁻¹for the stationary buffer, the stirred buffer and the saliva matrix, respectively.

Conclusions

“Absorptive Stripping Voltammetry” can be reliably applied to the detection of Δ ⁹ -tetrahydrocannabinol, after suitable optimisation of the assay. Usefully low practical limits of detection can be achieved.

【 授权许可】

   
2015 Nissim and Compton.

【 图 表 】

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