Liquid chromatographic determination of the adenosine receptor agonist CGS 21680 in blood using on-line solid-phase extraction on a phenylboronic acid support and fluorescence detection

H. Irth, A. Cleton, R. A. Mathôt, M. Danhof, A. P. IJzerman, U. R. Tjaden, J. van der Greef

Research output: Contribution to JournalComment / Letter to the editorAcademic

1 Citation (Scopus)


An analytical method is described for the selective determination of A1 or A2 adenosine receptor agonists in blood. By implementing solid-phase extraction using immobilized-phenylboronic acid (PBA) in sample pretreatment, all adenosine derivatives are retained via their intact cis-diol group. On-line desorption of the analytes from the PBA support to the C18 analytical column is performed by injection of a small plug of perchloric acid. Fluorescence and UV detection are employed for the different adenosine derivatives. The method is applied to the determination of 2-[p-(2-carboxyethyl)phenylethylamino]-5'-N- ethylcarboxyamidoadenosine (CGS 21680, I) in blood using fluorescence detection. The only off-line sample handling step is the extraction of blood with ethyl acetate and subsequent evaporation of the extraction solvent. The detection limit of the method was 0.25 ng (signal-to-noise ratio 3:1) and the determination limit for I in blood (pretreatment of 100 microliters) was 5 ng/ml. The method was validated and used to study the pharmacokinetics of I in rats
Original languageEnglish
Pages (from-to)207-212
JournalJournal of chromatography. B, Biomedical applications
Issue number1
Publication statusPublished - 1994

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