Hair testing for cocaine and metabolites by GC/MS: criteria to quantitatively assess cocaine use.
J Appl Toxicol
; 33(8): 838-44, 2013 Aug.
Article
em En
| MEDLINE
| ID: mdl-22407992
ABSTRACT
A simple, rapid and sensitive method has been developed and validated for the determination of cocaine and its main metabolites (benzoylecgonine and cocaethylene) in human hair. The method involved solid-phase extraction with an Oasis HLB extraction cartridge and subsequent analysis by GC/MS. The limit of detection was 0.01 ng mg(-1) for cocaine, 0.04 for benzoylecgonine and 0.03 for cocaethylene. The method validation included linearity (with a correlation coefficient >0.99 over the range 0.2-50 ng mg(-1) ), intra- and inter-day precision (always lower than 12%) and accuracy (mean relative error always below 17%) to meet the bioanalytical acceptance criteria. The procedure was further applied to 40 hair samples from self-reported cocaine users arrested by the police who provided a positive urine-analysis for cocaine, and was demonstrated to be suitable for its application in forensic toxicology. New approaches were raised to detect false-negative results that allow a better interpretation of hair testing results.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cocaína
/
Cabelo
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Cromatografia Gasosa-Espectrometria de Massas
Limite:
Female
/
Humans
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Male
Idioma:
En
Revista:
J Appl Toxicol
Ano de publicação:
2013
Tipo de documento:
Article