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- W1999664013 abstract "A new method for the determination of the peptide hormones and their fragments by capillary electrophoresis (CE) with laser-induced fluorescence (LIF) detection and transient pseudo-isotachophoresis (pseudo-tITP) preconcentration was established in this study. The LIF detector used an argon ion laser with excitation wavelength at 488 nm and emission wavelength at 535 nm. Fluorescein isothiocyanate (FITC) was used as precolumn derivatization reagent to label cholecystokinin tetrapeptide (CCK-4), neurotensin (NT), neurotensin hexapeptide (NT8–13), and neurokinin B (NKB). Borate (10 mmol/L, pH 9.0) was selected as derivatization medium to get the high efficiency. When the addition of 70% (v/v) methanol and 1% (m/v) sodium chloride (NaCl) to the sample matrix, and with borate buffer (110 mM, pH 9.5) and 20% (v/v) methanol as running buffer, a preconcentration based on the pseudo-tITP afforded 100-fold improvement in peak heights compared with the traditional hydrodynamic injection (2.3% capillary volume). The detection limits (signal/noise = 3) based on peak height were found to be 0.04, 0.1, 0.2, and 0.08 nmol/L for NT8–13, NT, NKB, and CCK-4, respectively. The method was validated and applied to qualitative analysis of NT and NT8–13 in human cerebrospinal fluid sample." @default.
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- W1999664013 date "2008-09-01" @default.
- W1999664013 modified "2023-10-16" @default.
- W1999664013 title "Separation and determination of peptide hormones by capillary electrophoresis with laser-induced fluorescence coupled with transient pseudo-isotachophoresis preconcentration" @default.
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- W1999664013 doi "https://doi.org/10.1016/j.ab.2008.06.002" @default.
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