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Analytical and Bioanalytical Chemistry

, Volume 405, Issue 25, pp 8063–8072 | Cite as

Amino acid analysis of dried blood spots for diagnosis of phenylketonuria using capillary electrophoresis-mass spectrometry equipped with a sheathless electrospray ionization interface

  • Ji-Seon Jeong
  • Sook-Kyung Kim
  • Sang-Ryoul ParkEmail author
Research Paper
Part of the following topical collections:
  1. Amino Acid Analysis

Abstract

We describe a capillary electrophoresis-mass spectrometry (CE-MS) method for newborn screening of a representative amino acid metabolic disease, namely, phenylketonuria (PKU). Underivatized phenylalanine and tyrosine in a dried blood spot (DBS) were simultaneously determined by CE-MS equipped with an ionophore membrane-packed sheathless electrospray ionization interface, which was developed by our group. The method was optimized for rapid determination of the underivatized amino acids, phenylalanine and tyrosine extracted from a DBS. Under the optimized conditions, the limit of detection of phenylalanine and tyrosine (signal-to-noise ratio, 3) was 0.03 and 0.07 mg/L in DBS, respectively, with a CE run time of less than 3 min. For repeated runs of a sample, coefficients of variation (CVs) for migration time were less than 3.7 %, whereas CVs for the area ratio under the curve were 2.1 and 2.9 % for 20 consecutive runs of 49.5 mg/kg Phe and 36.2 mg/kg Tyr, respectively. However, the relative standard deviations of intra- and interday assays for DBS samples were <6.2 and <5.8 %, respectively, which were substantially due to sample extraction from DBS. The analytical method was applied to real clinical samples of Korean neonates, and results were compared with those of conventional methods for PKU diagnosis, which required reference analytical methods such as isotope dilution CE-MS or high-performance liquid chromatography-mass spectrometry for quality assurance of the conventional kit-based assays. The distinct advantages of high sensitivity and extremely low sample volume, as well as a simple, easy, and economic sample pretreatment, were demonstrated for the proposed method.

Keywords

Sheathless CE/ESI-MS Amino acid Isotope dilution Newborn screening Dried blood spot Phenylketonuria 

Notes

Acknowledgment

This work was supported by the Korea Research Institute of Standards and Science under the project “Development of Protein Measurement Standards,” Grant 13011017.

Supplementary material

216_2013_6999_MOESM1_ESM.pdf (402 kb)
ESM 1 (PDF 401 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Ji-Seon Jeong
    • 1
  • Sook-Kyung Kim
    • 1
  • Sang-Ryoul Park
    • 1
    Email author
  1. 1.Center for Bioanalysis, Division of Metrology for Quality of LifeKorea Research Institute of Standards and ScienceYuseong-guRepublic of Korea

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