Use of cation exchange chromatography for human C-peptide isotope dilution - mass spectrometric assay.

Use of cation exchange chromatography for human C-peptide isotope dilution - mass spectrometric assay.
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DOI:
10.1016/j.chroma.2011.10.080
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发表时间:
2011-12-23
期刊:
Journal of chromatography. A
影响因子:
--
通讯作者:
Little RR
Little RR
中科院分区:
其他
文献类型:
--
作者:
Stoyanov AV;Rohlfing CL;Connolly S;Roberts ML;Nauser CL;Little RR

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An application of ion exchange chromatography for C-peptide analysis is described here. At the stage of C-peptide isolation, a strong cation exchanger (SP HP or MonoS) was used to purify the analyte from ballast proteins and peptides. The conditions of ion-exchange chromatographic separations were optimized using theoretical modeling of the net surface electric charge of the peptide as a function of pH. The purified and concentrated sample was further subjected to LC-MS/MS. In order to improve the reliability of analysis, two fragment ions were monitored simultaneously both for native C-peptide and internal standard, isotopically labeled C-peptides analogues (fragments with m/z of 927.7 and 147.2). Using ion-exchange chromatography, it became possible to process larger sample volumes, important for testing patients with very low C peptide levels, compared to currently used solid phase extraction methods.
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发表时间: 1978-01-01
期刊: DIABETES
影响因子: 7.7
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