Abstract
We applied the metabolomic analysis of comprehensive small-molecular metabolites using liquid chromatography/electrospray ionization-tandem mass spectrometry (LC/ESI-MS/MS) and principal component analysis to identify uremic toxins accumulated in the serum of chronic renal failure (CRF) rats. CRF rats were produced by 5/6-nephrectomy. Indoxyl sulfate was demonstrated to be the first principal serum metabolite which differentiates CRF from normal, followed by phenyl sulfate, hippuric acid and p-cresyl sulfate. Then, we measured the serum levels of indoxyl sulfate, phenyl sulfate, hippuric acid and p-cresyl sulfate by the selected reaction monitoring (SRM) of LC/ESI-MS/MS, and demonstrated that these serum levels were markedly increased in CRF rats as compared with normal rats. As creatinine clearance decreased, the serum levels of the metabolites increased.
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