Rapid Determination of Cocaine and Its Metabolite Benzoylecgonine in Hair by LC-MS/MS / 法医学杂志

OBJECTIVES@#To establish a rapid determination method with LC-MS/MS for cocaine and its metabolite benzoylecgonine in hair.@*METHODS@#Deuterated internal standards （cocaine-D₃ and benzoylecgonine-D₈） were added to the decontaminated hair. After the extraction by ultrasonication with methanol, the compounds were separated by the Restek Allure PFP propyl column, and cocaine and benzoylecgonine were simultaneously analysed in multiple reaction monitoring mode.@*RESULTS@#The cocaine and benzoylecgonine in hair showed a good linearity in the range of mass fraction between 0.02 and 10.00 ng/mg with the limits of detection of 0.01 ng/mg.@*CONCLUSIONS@#The developed method is simple and rapid with a good selectivity, which is suitable for the determination of cocaine and its metabolite benzoylecgonine in hair.

Detección de Benzoilecgonina en orina de consumidores de té de coca mediante métodos de inmunoensayo / Detection of Benzoilecgonine in urine of consumers of coca tea by immunoassay methods

Con el fin de detectar la presencia de benzoilecgonina en orina de consumidores de té de coca, se realizó un estudio piloto analizando muestras de orina a 10 voluntarios sanos, no consumidores de cocaína, antes de ingerir la infusión de té de coca (Nasa Esh´s Coca Nasa), y las recolectadas hasta las 48 horas después de la ingestión, de una toma única de 100 mL el mismo día. El análisis se realizó por métodos de inmunoensayo, cualitativo, mediante pruebas rápidas Acu-check, y semicuantitativo AxSYM Cocaine Metabolite, basado en In munoensayo de Fluorescencia Polarizada (FPIA). Antes de la ingestión de la infusión por los métodos cualitativos y semicuantitativos las muestras recolectadas resultaron negativas, después de haber ingerido la infusión, por ambos métodos se detectó concentraciones de benzoilecgonina desde la primera hasta las 48 horas con diversas variaciones entre las muestras, observándose excelente concordancia entre los métodos para la determinación de benzoilecgonina en orina. En este estudio, se concluyó que existe la presencia de benzoilecgonina en muestras de orina de consumidores de té de coca. Los métodos utilizados sólo proporcionan resultados preliminares, se recomienda utilizar unos más específicos a fin de encontrar parámetros que permitan discriminar individuos que hayan ingerido infusión de té de coca, de aquellos que son adictos a la cocaína. Además, es importante prevenir a los consumidores de té de coca sobre el riesgo de detección de benzoilecgonina en orina dentro de las primeras 24 a 48 horas y las implicaciones que trae consigo tales hallazgos de laboratorio.

In order to detect the presence of benzoylecgonine in urine of consumers of coca tea, a pilot study was conducted by analyzing urine samples from 10 volunteers not cocaine users, be fore drinking the coca tea infusion, and collected until 48 hours after ingestión of a single shot (100 mL) the same day, The analysis was performed by immunoassay qualitative methods, using fast Acu-check tests, and semi quantitative automated equipment Abbott Axsym System, based on fluorescence polarization immunoassay (FPIA). Before ingestion of the infusion for qualitative and semiquantitative methods for samples collected were negative, and after drinking the tea, for both methods, concentrations of benzoylecgonine was detected from the first to 48 hours with several variations between samples, observed excellent agreement between the methods for the determination of benzoilecgonine in urine. In this study, we concluded that there is the presence of benzoylecgonine in urine samples from consumers of coca tea. According to the methods used provide only preliminary results, we recommend using a more specific in order to find parameters to discriminate individuals who have ingested coca tea infusions of dose that are cocaine addicts, In turn, it is important to prevent cosumers coca tea on the risk of detection of benzoylecgonine in urine within the first 24 to 48 hours and the implications it brings such laboratory findings.

Determination of cocaine and benzoylecgonine in guinea pig's hair after a single dose administration by LC-MS/MS / 药学学报

A sensitive LC-MS/MS method to determine cocaine and its major metabolite benzoylecgonine in guinea pig's hair has been established. About 20 mg of decontaminated hair sample was hydrolyzed with 0.1 mol·L-1 HCl at 50 ℃ overnight, in the presence of cocaine-d3 and benzoylecgonine-d8 used as internal standards, and then extracted with dichlormethane. The analysis was performed by liquid chromatography-tandem mass spectrometry (LC-MS/MS). Positive electrospray ionization (ESI+) and multiple reactions monitoring (MRM) mode were used. The limit of detection (LOD) for cocaine and benzoylecgonine was 1 pg·mg-1. The calibration curves of extracted standards were linear over the range from 5 pg·mg-1 to 250 pg·mg-1 (r2≥0.999 7). The method was validated and applied to the analysis of guinea pig's hair after a single dose administration of cocaine hydrochloride. Cocaine and benzoylecgonine were not only detected, but also quantified in guinea pigs hair.