ABSTRACT
OBJECTIVE@#To establish a new method for the analysis of paraquat in blood and urine by sodium borohydride/nickel chloride chemical reduction-gas chromatography/thermionic specific detector.@*METHODS@#An initial procedure of precipitation was performed by adding hydrochloric solution with sodium chloride and a mixture of chloroform and ethanol. Then the analyte contained in supernatant was reduced by a reduction system of sodium borohydride and nickel chloride and extracted by acetic ether. Ethyl paraquat (EPQ) was used as internal standard. GC/TSD was used to identify and quantify the analyte.@*RESULTS@#The limits of detection (S/N=3) in blood and urine were 0.002 and 0.004 microg/mL, respectively. The linear ranges were 0.050-30.0 microg/mL. Correlation coefficients in blood and urine were 0.999 and 0.998, respectively. The recoveries exceeded 80% both in blood and urine.@*CONCLUSION@#This method is applicable for quantification of paraquat in biological fluids.
Subject(s)
Humans , Borohydrides/chemistry , Chromatography, Gas/methods , Forensic Toxicology , Herbicides/urine , Nickel/chemistry , Oxidation-Reduction , Paraquat/urine , Sensitivity and SpecificityABSTRACT
Se efectúa el estudio de la reacción de reducción del 15-acetato PGA2 metil éster con borohidruro de sodio, el cual provoca la pérdida del doble enlace C10-C11 al seguir un mecanismo de adición 1,4 de acuerdo con nuestras condiciones de trabajo y se demuestra que es un reactivo no estereoespecífico. Esto se comprueba mediante el análisis espectroscópico IR y UV, así como por cromatografía de capa delgada de los productos obtenidos y verificados por el posterior producto de oxidación