A new derivatization procedure for the analysis of hippuric acid and m-methyl-hippuric acid by gas chromatography |
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| Authors: | D de Carvalho V L Lanchote P S Bonato R H C Queiroz A C Santos S A C Dreossi |
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| Institution: | (1) Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brasil |
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| Abstract: | Summary The industrial solvents, toluene and xylene, have physicochemical properties that can be hazardous to the workers exposed. Since hippuric acid and m-methyl-hippuric acid represent the products of toluene and xylene biotransformation in urine, they are used as biological markers in studies on occupational exposure to these solvents. Several methods have been used to determine hippuric acid and m-methyl-hippuric acid —either based on gas chromatography or on high-performance liquid chromatography. In this study we propose the derivatization of hippuric acid and methyl-hippuric acid using methanol in acid medium (HCl), a low-cost reagent with a low level of toxicity. The method has been routinely used in our laboratory for 1 year and has proven to be a reliable procedure for the biological control of occupational exposure to toluene and/or xylene. |
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| Keywords: | Toluene Xylene Occupational exposure Hippuric acid m-Methyl-hippuric acid Biological markers Methanol in acid medium |
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