@article{ref1,
title="Analysis of the major metabolite of delta 9-tetrahydrocannabinol in urine II. A HPLC procedure",
journal="Journal of analytical toxicology",
year="1983",
author="Wells, K. E. and Dimson, P. A. and Jones, A. B. and ElSohly, H. N. and ElSohly, M. A.",
volume="7",
number="6",
pages="262-264",
abstract="A high performance liquid chromatographic (HPLC) procedure was developed for the analysis of 11-nor-delta 9-tetrahydrocannabinol-9-carboxylic acid in urine. Hydrolyzed urine samples were cleaned up using Bond-Elut columns. 11-Nor-cannabinol-9-carboxylic acid was used as internal standard. The analysis was carried out using a C8 reversed-phase column with acetonitrile:50 mM phosphoric acid (65:35) as the solvent. Detection was done by ultraviolet detector at 214 nm. The minimum detectable level of 11-nor-delta 9-tetrahydrocannabinol-9-carboxylic acid was 25 ng/mL.<p /><p>Language: en</p>",
language="en",
issn="0146-4760",
doi="",
url="http://dx.doi.org/"
}