Development, validation and clinical evaluation of a dried urine spot method for determination of hippuric acid and creatinine.
Clin Biochem
; 46(13-14): 1276-80, 2013 Sep.
Article
em En
| MEDLINE
| ID: mdl-23868019
OBJECTIVES: The purpose of this study was to develop and validate a HPLC-DAD method for determination of creatinine and hippuric acid in dried urine spots (DUS), evaluating its clinical applicability. DESIGN AND METHODS: Sample preparation was based on a simple one step extraction with water. Analysis was performed in a reversed phase column Hypersil Gold C18 (150 × 4.6 mm, 3 µm) with isocratic elution. Mobile phase was a mixture of triethylammonium phosphate buffer 5 mM, pH 3.3 and acetonitrile (90:10, v/v). RESULTS: Total analytical run time was 6 min. Precision assays presented CV% lower than 11.8%. Accuracy was 96.0-103%. The lower limit of quantitation was 50 mg L(-1). Mean extraction yields were 99% for CR and 79.3% for HA. Analytes were stable in DUS up to 11 days at 40 °C. The method was tested in 49 paired DUS and urine samples, with acceptable agreement. HA-CR concentration ratios in DUS were in the range of 0.06 to 2.74, being in average 100.7% from those values found in urine. CONCLUSIONS: DUS samples are a useful alternative for biological monitoring of toluene occupational exposure, especially in Developing Countries where sample logistics could be an important concern.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cromatografia Líquida de Alta Pressão
/
Exposição Ocupacional
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Creatinina
/
Hipuratos
Limite:
Humans
Idioma:
En
Revista:
Clin Biochem
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Estados Unidos