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author:

Chen, Ying (Chen, Ying.) [1] | Xu, Liangjun (Xu, Liangjun.) [2] | Zhang, Lan (Zhang, Lan.) [3] | Chen, Guonan (Chen, Guonan.) [4]

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EI

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. © 2008 Elsevier Inc. All rights reserved.

Keyword:

Argon lasers Capillary electrophoresis Cerebrospinal fluid Endocrinology Fluorescence Hormones Laser excitation Laser optics Laser produced plasmas Methanol Peptides Sodium chloride

Community:

  • [ 1 ] [Chen, Ying]Ministry of Education, Key Laboratory of Analysis and Detection Technology for Food Safety, Department of Chemistry, Fuzhou, Fujian 350002, China
  • [ 2 ] [Chen, Ying]Analytical and Testing Center, Fuzhou University, Fuzhou, Fujian 350002, China
  • [ 3 ] [Xu, Liangjun]Analytical and Testing Center, Fuzhou University, Fuzhou, Fujian 350002, China
  • [ 4 ] [Zhang, Lan]Ministry of Education, Key Laboratory of Analysis and Detection Technology for Food Safety, Department of Chemistry, Fuzhou, Fujian 350002, China
  • [ 5 ] [Chen, Guonan]Ministry of Education, Key Laboratory of Analysis and Detection Technology for Food Safety, Department of Chemistry, Fuzhou, Fujian 350002, China

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Source :

Analytical Biochemistry

ISSN: 0003-2697

Year: 2008

Issue: 2

Volume: 380

Page: 297-302

3 . 0 8 8

JCR@2008

2 . 6 0 0

JCR@2023

JCR Journal Grade:1

Cited Count:

WoS CC Cited Count: 0

SCOPUS Cited Count: 21

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 2

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