Three-Dimensional High-Performance Liquid Chromatographic Determination of Asn, Ser, Ala, and Pro Enantiomers in the Plasma of Patients with Chronic Kidney Disease

Aogu Furusho, Reiko Koga, Takeyuki Akita, Masashi Mita, Tomonori Kimura, Kenji Hamase

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The concentrations of several d-amino acids have been reported to significantly increase in the plasma of patients with chronic kidney disease (CKD). However, the amounts of these d-amino acids are low (around 1% of the l-form or lower), and their analyses were complicated by various interfering compounds in many clinical samples. A highly selective analytical method is thus required to perform the accurate and precise determination of these d-amino acids in the plasma of CKD patients. In the present study, a selective 3D-HPLC system equipped with reversed-phase, anion-exchange, and enantioselective columns has been designed and developed for the determination of the asparagine, serine, alanine and proline enantiomers. For the sensitive analysis, amino acids were precolumn derivatized with 4-fluoro-7-nitro-2,1,3-benzoxadiazole and detected by their fluorescence. The system was validated by using human plasma in addition to the standard amino acids, and results with a sufficient linearity, precision, and accuracy were obtained. The 3D-HPLC system was applied to the plasma of patients with different stages of CKD and all of the target d-amino acids were clearly observed without interferences for all 25 tested patients. Good correlations were shown between the kidney function of the patients and the %d values of the target analytes, especially d-Asn and d-Ser, indicating that the present 3D-HPLC method is useful for the sensitive diagnosis of CKD.

Original languageEnglish
Pages (from-to)11569-11575
Number of pages7
JournalAnalytical chemistry
Volume91
Issue number18
DOIs
Publication statusPublished - Sep 17 2019

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

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