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Published on: May 19, 2012
A high-performance liquid chromatography method for the detection of diaminopimelic acid in urine
G Borruat1, C A Roten, L B Fay
1Institut de Génétique et de Biologie Microbiennes, Rue César-Roux 19, CH-1005 Lausanne, Switzerland.
Abstract:
We describe a quantitative assay for diaminopimelic acid (DAP) in urine. It involves (i) hydrolysis of urine samples, (ii) purification by several different liquid chromatography steps, and (iii) analysis by high-performance liquid chromatography on a reversed-phase C18 column. Tritiated-DAP, the internal standard, allows one to precisely follow the DAP-containing fractions and to determine the yield during purification. Sensitive and relatively accurate quantification of DAP, with a threshold of 50 fmol, is based on ion-pairing properties of eluants and ortho-phthaldialdehyde derivatization. The presence of DAP in relevant fractions was confirmed by combined gas chromatography and mass spectrometry. The DAP concentration in adult human urine pooled over 24 h ranges from 0.69 to 2.01 microM, a result in fair agreement with previously published values obtained by ninhydrin derivatization or gas chromatography.
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