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N ‐Methyl‐ D ‐glucamine improves the laser‐induced fluorescence capillary electrophoresis performance in the total plasma thiols measurement
Author(s) -
Zinellu Angelo,
Carru Ciriaco,
Galistu Franca,
Usai Maria Franca,
Pes Giovanni Mario,
Baggio Giovannella,
Federici Giorgio,
Deiana Luca
Publication year - 2003
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.200305570
Subject(s) - chemistry , chromatography , capillary electrophoresis , reagent , laser induced fluorescence , reproducibility , fluorescence , high performance liquid chromatography , fluorescence spectroscopy , analytical chemistry (journal) , sample preparation , organic chemistry , physics , quantum mechanics
We describe an ultrarapid capillary electrophoresis with laser‐induced fluorescence (CE‐LIF) method for total plasma thiols measurement. Reduced thiols by 10% tri‐ n ‐butylphosphine (TBP) were derivatized in 10 min at room temperature with 5‐iodoacetamidofluorescein (5‐IAF) as fluorescent reagent. We show that CE‐LIF allows a baseline separation of total plasma cysteinylglycine, homocysteine, cysteine, and glutathione in less than 5 min when N ‐methyl‐ D ‐glucamine in run buffer was added. CE was compared with high‐performance liquid chromatography (HPLC) with fluorescence detection. The Bland‐Altman test and Passing‐Bablok regression demonstrates that the results obtained by CE‐LIF and by HPLC are highly comparable. The simplified procedure of sample preparation, the short incubation and fast separation times, the high specificity, sensitivity and reproducibility, and the lower cost of analysis suggest that our proposed method can be considered valuable for the automation analysis in a routine laboratory.