@article{ref1,
title="Solid-phase extraction, identification, and quantitation of 11-nor-delta-9-tetrahydrocannabinol-9-carboxylic acid",
journal="Journal of forensic sciences",
year="1990",
author="Nakamura, G. R. and Meeks, R. D. and Stall, W. J.",
volume="35",
number="4",
pages="792-796",
abstract="A procedure has been developed to extract and recover minute amounts of delta-9-carboxytetrahydrocannabinol (THC-COOH) from urine. A new non-isotopic internal standard is introduced to permit a chromatographic assay of the metabolite. The method affords a 91% recovery of 20 ng/mL of the THC-COOH acid from spiked urine with the assurance of a 3.8% coefficient of variation.<p /> <p>Language: en</p>",
language="en",
issn="0022-1198",
doi="",
url="http://dx.doi.org/"
}