Zinellu, Angelo and Sotgia, Salvatore and Deiana, Luca and Carru, Ciriaco (2013) Quantification of arginine and dimethylated arginines in human plasma by field-amplified sample injection capillary electrophoresis UV detection. In: Volpi, Nicola and Maccari, Francesca (eds). Capillary electrophoresis of biomolecules: methods and protocols. [S.l.], Humana Press. p. 131-138. (Methods in molecular biology, 984). ISBN 978-1-62703-295-7. eISBN 978-1-62703-296-4. Book Section.
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We report a capillary electrophoresis method by field-amplified sample injection (FASI) for the separation and detection of free plasma arginine and dimethylated arginines. Protein elimination from plasma was performed by acetonitrile/ammonia precipitation. Supernatants were dried, reswollen in water, and directly injected on capillary without complex cleanup by solid-phase extraction and/or tedious sample derivatization procedures. Analytes were baseline-separated within 22 min by using 50 mmol/L Tris phosphate pH 2.3 as running buffer. Due to the stacking effects of electrokinetic injection, it is possible to perform a considerable on-line preconcentration of the analytes before running the electrophoresis. This procedure allows to reach a detection limit in real sample of 10 nmol/L for dimethylated arginines and 20 nmol/L for arginine. Recovery of plasma ADMA was 99–104 % and inter-day CV was less than 3 %.
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