Simultaneous determination of phenylalanine and tyrosine levels in human blood obtained by the dried spot technique for monitoring of patients with phenylketonuria

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F25%3A39922832" target="_blank" >RIV/00216275:25310/25:39922832 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.jpba.2025.116831" target="_blank" >https://doi.org/10.1016/j.jpba.2025.116831</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jpba.2025.116831" target="_blank" >10.1016/j.jpba.2025.116831</a>

Result language

angličtina

Original language name

Simultaneous determination of phenylalanine and tyrosine levels in human blood obtained by the dried spot technique for monitoring of patients with phenylketonuria

Original language description

Monitoring patients with phenylketonuria (PKU) requires accurately measuring phenylalanine and tyrosine levels in a small volume of blood samples obtained by the dried blood spot (DBS) technique. The aim was to study selected parameters influencing the quantitative results. Phenylalanine and tyrosine were extracted from DBS samples with methanol, and 5 internal standard introduction techniques were tested. Phenylalanine and tyrosine levels were measured in 6-mm discs punched from DBS, pre-punched 9-mm discs containing the entire DBS sample, and liquid blood by HPLC-MS-MS. Levels in 6-mm discs punched from DBS measured by HPLC-MS/MS were compared with those measured by the HPLC-FLD. The analytical parameters of the method are satisfactory, linearity in the range of 25–1200 μmol/L (LOD, LOQ and LLOQ values 0.2 μmol/L, 0.5 μmol/L and 3.8 μmol/L for phenylalanine, 0.5 μmol/L, 1.5 μmol/L and 5.1 μmol/L for tyrosine), within-run precision 1.8 %–3.7 % for phenylalanine, 1.9 %–2.7 % for tyrosine, between-run precision 4.7 %–5.9 % for phenylalanine, 4.1 %–5.4 % for tyrosine, recovery 93.8 %–100.4 % for phenylalanine and 93.7 %–99.1 % for tyrosine. Good agreement was found between phenylalanine and tyrosine concentrations in 6-mm discs punched from DBS (R = 0.896, p &lt; 0.001, and R = 0.907, p &lt; 0.001, respectively), pre-punched 9-mm discs containing the entire DBS sample (R = 0.960, p &lt; 0.001, and R = 0.950, p &lt; 0.001, respectively) and liquid blood, as well as between phenylalanine and tyrosine concentrations obtained by HPLC-MS/MS and HPLC-FLD (R = 0.968, p &lt; 0.001, and R = 0.984, p &lt; 0.001, respectively). The presented method is suitable for monitoring patients with PKU.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10406 - Analytical chemistry

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Pharmaceutical and Biomedical Analysis

ISSN

0731-7085

e-ISSN

1873-264X

Volume of the periodical

260

Issue of the periodical within the volume

August 2025

Country of publishing house

US - UNITED STATES

Number of pages

10

Pages from-to

116831

UT code for WoS article

001454117200001

EID of the result in the Scopus database

2-s2.0-105000487145