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Electrophoresis. 2014 Apr;35(7):1050-9. doi: 10.1002/elps.201300426. Epub 2014 Jan 13.

Derivatization strategies for CE-LIF analysis of biomarkers: Toward a clinical diagnostic of familial transthyretin amyloidosis.

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Faculté de Pharmacie, Université Paris-Sud, Châtenay-Malabry, France; CNRS, Institut Galien Paris-Sud, UMR 8612, Châtenay-Malabry, France.


We report three derivatization strategies for CE analysis with LIF detection (CE-LIF) of two synthetic peptides mimicking the wild and mutated fragments of interest for the diagnosis of familial transthyretin amyloidosis. The precapillary derivatization of the peptides with three optical tags, 5-carboxytetramethylrhodamin succinimidyl ester (TAMRA-SE), naphtalene-2,3-dicarboxyaldehyde (NDA), and 3-(2-furoyl)quinoline-2-carboxyaldehyde (FQ) has been investigated by CE-LIF detection and MS. Results provide evidence that high reaction yields have been reached whereas the multitagging phenomenon has occurred for both NDA and TAMRA-SE labeling procedures. The derivatization and electrokinetic separation of a mixture of the two peptides of interest for the pathology diagnosis (22-aa peptides that differ only from one amino acid) were achieved using both approaches. The highest resolution with a value of 2.5 was obtained with TAMRA-SE labeled derivatives whereas NDA gave the best detection sensitivity (LOD of 2.5 μM). The validation of the developed methods showed a good linearity (R ≥ 0.997) between the peak area of the labeled derivatives and the peptide concentration for both NDA and FQ labeling procedures. The intraday RSDs of A and the migration times were less than 3.8 and 2.2%, respectively.


CE; Familial transthyretin amyloidosis; LIF; MS; Peptide labeling

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