Abstract
The reference material was prepared by freeze-drying pooled urine samples obtained from healthy persons occupationally exposed to styrene. The concentrations of mandelic acid (MA), phenylglyoxylic acid (PGA), and hippuric acid (HA) in urine were determined by three modes of high-performance liquid chromatography (HPLC). For isochronous stability testing the urinary mandelic acid and phenylglyoxylic acid concentrations were followed over a 24-month period for a preliminary batch by use of HPLC. No changes of the concentration values were found. The creatinine concentration was stable for more than five years. Standard Reference Material NIST 914a Creatinine was used for traceability purposes for creatinine. Pure chemicals MA and PGA were used for traceability purposes. Control material ClinChek-Urine Control (Recipe) was analyzed simultaneously. The mean values of MA and PGA compare well with the means and fall within the control range of control samples. Results from homogeneity, stability, and traceability testing were evaluated using the statistical program ANOVA. The certified values and their uncertainties were evaluated from the results of interlaboratory comparisons, and homogeneity and stability tests. The values are unweighed arithmetical averages of accepted results and their uncertainties are combined uncertainties (coverage factor=1).
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Abbreviations
- MA:
-
Mandelic acid
- HA:
-
Hippuric acid
- PGA:
-
Phenylglyoxylic acid
- 3-HBA:
-
3-Hydroxybenzoic acid
- ANOVA:
-
Analysis of variance
- CV:
-
Coefficient of variance
- NIST:
-
National Institute of Standards and Technology
- HPLC:
-
High-performance liquid chromatography
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Acknowledgement
This work was supported by the Internal Grant Agency of the Ministry of Health of the Czech Republic (Grant No. NJ/6784–3).
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Šperlingová, I., Dabrowská, L., Stránský, V. et al. Human urine certified reference material CZ 6009: creatinine, styrene metabolites (mandelic acid and phenylglyoxylic acid). Anal Bioanal Chem 378, 1208–1212 (2004). https://doi.org/10.1007/s00216-003-2222-5
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DOI: https://doi.org/10.1007/s00216-003-2222-5