Loading…
GC–MS quantification of ketamine, norketamine, and dehydronorketamine in urine specimens and comparative study using ELISA as the preliminary test methodology
An automated solid-phase extraction procedure combined with the gas chromatography–mass spectrometry (GC–MS) methodology, without derivatization, has been developed for the determination of ketamine (K), norketamine (NK), and dehydronorketamine (DHNK) in urine. The analytical approach is simple and...
Saved in:
Published in: | Journal of chromatography. B, Analytical technologies in the biomedical and life sciences Analytical technologies in the biomedical and life sciences, 2007-06, Vol.852 (1), p.443-449 |
---|---|
Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | An automated solid-phase extraction procedure combined with the gas chromatography–mass spectrometry (GC–MS) methodology, without derivatization, has been developed for the determination of ketamine (K), norketamine (NK), and dehydronorketamine (DHNK) in urine. The analytical approach is simple and rapid, yet reliable, achieving good linearity (
r
2
>
0.999 over the concentration range of 30 to 1000
ng/mL), sensitivity (limits of quantification
=
15, 10, and 20
ng/mL for K, NK, and DHNK, respectively), accuracy (90–104%), and precision (RSD
<
8.1%) for all analytes. Two hundred and six urine specimens collected from suspected drug users were analyzed by this protocol and also screened by Neogen ELISA method to evaluate the efficiency as well as the compatibility of these two methods. Neogen ELISA showed high efficiency (98.1%), high sensitivity (90.9%), high specificity (98.9%), low false-positive rate (1.1%), and moderate false-negative rate (9.1%), adopting 10
ng/mL K as the cutoff. Neogen ELISA screening followed by GC–MS analysis appeared to be a good screening-confirmation test scheme for the analysis of K in urine. Twenty of the 22 positive urine specimens contained all three analytes simultaneously, with DHNK showing the highest and K the lowest concentrations. |
---|---|
ISSN: | 1570-0232 1873-376X |
DOI: | 10.1016/j.jchromb.2007.02.005 |