Servicios Personalizados
Revista
Articulo
Indicadores
Citado por SciELO
Accesos
Links relacionados
Citado por Google
Similares en SciELO
Similares en Google
Compartir
Revista de la Universidad Industrial de Santander. Salud
versión impresa ISSN 0121-0807
Resumen
MEDINA P, Olga M; SANCHEZ R, Luz H y FLOREZ-VARGAS, Oscar. Cholinesterase enzyme activity in human blood samples: effects of the store conditions. Rev. Univ. Ind. Santander. Salud [online]. 2015, vol.47, n.2, pp.151-158. ISSN 0121-0807.
Introduction: Determination of cholinesterase (ChE) enzyme activity is the main biomarker of exposure to pesticides organophosphorus and carbamate. Therefore, the enzyme stability of ChEsin blood samples is an important pre-analytical factor to take into account in the diagnosis. Objective: To determine the effect of storage time and temperature on ChEs enzyme activity in human blood samples. Methodology: Whole-blood samples and erythrocyte suspensions (erythrocyte + 0.9% saline solution; ratio 1:1) were stored at -20°C, 4°C and 25°C. Enzyme activity measurements were performed at one hour after the blood samples have been obtained and then were repeated between days 1 and 90. Total ChE and Acetyl-ChE activities were determined using the Limperos & Ranta colorimetric method and the potentiometric method of Michel respectively. Results: The maximum stability of the total ChE enzyme activity was achieved at -20°C for 60 days and, in the case of Acetyl-ChE, at 4°C for the time the study was conducted. A decrease of Acetyl-ChE activity was shown after 7 days at 25°C and 4 days at -20°C. Conclusion: In terms of diagnosis, we recommend that in order to measure the total ChE activity the wholeblood samples should be stored at -20°C for 30 days, whereas to measure the Acetyl-ChE activity the erythrocyte suspensions in 0.9% NaCl at 4°C for 14 days.
Palabras clave : Cholinesterases; Pesticides; Blood; Enzyme stability.