RESUMO
Hippuric acid is the primary metabolite of toluene, a solvent widely used in industrial processes with considerable toxic effects, a fact which justifies regularly monitoring individuals with occupational exposure to this solvent. This work aims at evaluating urinary hippuric acid levels found in workers subject to biological monitoring. A retrospective study was carried out with data referring from 2002 to 2005, in which exams results and employment status were analyzed (periodic, post-employment, and pre-employment exams). Results indicate a significant reduction in hippuric acid levels for 2005. Periodic exams presented higher results than pre-employment and post-employment exams. No significant difference was found in individuals grouped according to their status in each of the established intervals, their reference numbers, and maximum biological levels allowed. Hippuric acid levels detected indicate low risk of toluene exposure for the population under evaluation, probably due to a growing concern with the deployment of measures regarding occupational hygiene.
Assuntos
Hipuratos/urina , Exposição Ocupacional , Humanos , Estudos RetrospectivosRESUMO
O ácido hipúrico é o principal metabólito do tolueno, solvente amplamente utilizado em processos industriais e com importantes efeitos tóxicos, fato que justifica a preocupação em monitorar regularmente sujeitos com risco de exposição ocupacional a este solvente. O objetivo deste trabalho foi avaliar os níveis de ácido hipúrico encontrados em trabalhadores submetidos à monitorização biológica. Foi realizado um estudo retrospectivo com dados dos anos de 2002 a 2005, no qual foram analisados os resultados e a situação do empregado na oportunidade do exame (periódico, demissional e admissional). Os resultados indicam uma redução significativa nos níveis de ácido hipúrico em 2005. Exames periódicos obtiveram resultados superiores aos exames admissionais e demissionais, e não foi verificada diferença significativa nas proporções dos sujeitos agrupados de acordo com a situação funcional em cada um dos intervalos estabelecidos segundo o valor de referência e o índice biológico máximo permitido. Os níveis de ácido hipúrico detectados indicam um baixo de risco de exposição ao tolueno na população avaliada, provavelmente em decorrência da preocupação crescente com a implantação de medidas de higiene ocupacional.
Hippuric acid is the primary metabolite of toluene, a solvent widely used in industrial processes with considerable toxic effects, a fact which justifies regularly monitoring individuals with occupational exposure to this solvent. This work aims at evaluating urinary hippuric acid levels found in workers subject to biological monitoring. A retrospective study was carried out with data referring from 2002 to 2005, in which exams results and employment status were analyzed (periodic, post-employment, and pre-employment exams). Results indicate a significant reduction in hippuric acid levels for 2005. Periodic exams presented higher results than pre-employment and post-employment exams. No significant difference was found in individuals grouped according to their status in each of the established intervals, their reference numbers, and maximum biological levels allowed. Hippuric acid levels detected indicate low risk of toluene exposure for the population under evaluation, probably due to a growing concern with the deployment of measures regarding occupational hygiene.
Assuntos
Humanos , Hipuratos/urina , Exposição Ocupacional , Estudos RetrospectivosRESUMO
Tobacco dependence reaches nearly one third of the world population, and is the second leading cause of deth around the world. Cotinine, a major metabolite of nicotine, is conssidered the most appropriate parameter to evaluate tobacco exposure HLPC (High Performance Liquid Chromatography) was choses to analyze cotinine concentrations in urine. Aiming at validating this method of analysis, urine samples with added cotinine were submitted to liquid-liquid extractions using2-phenylimidazole as the internal standard. After evaporation, residue was injected in HLPC with ultraviolet detection and C8 column. The following parameters were stabilishe: linearity, precision, detection and qualification limit, accuracy, ans stability. The calibration curve, determined ian a interval of 10ng/mL and 1000ng/mL, presented linearity (R2 = 0,09979). The method limit of detection was of 5ng/mL, and the limit of quantification was of 10ng/mL. In 50, 500, and 1000ng/mL concentrations, the precision was of 11.2; 12.3, and 8.1 per cent, accuracy found was of 107.0; 101.7, and 97.0 per cent, and loss during the stability test was of 8.1...
