Combining isoelectric point-based fractionation, liquid chromatography and mass spectrometry to improve peptide detection and protein identification.

Combining isoelectric point-based fractionation, liquid chromatography and mass spectrometry to improve peptide detection and protein identification.
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DOI:
10.1016/j.jasms.2010.04.010
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发表时间:
2010-09
影响因子:
3.2
通讯作者:
Russell DH
Russell DH
中科院分区:
化学3区
文献类型:
--
作者:
Cologna SM;Russell WK;Lim PJ;Vigh G;Russell DH

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The off-line coupling of an isoelectric trapping device termed membrane separated wells for isoelectric focusing and trapping (MSWIFT) to mass spectrometry-based proteomic studies is described. The MSWIFT is a high capacity, high-throughput, mass spectrometry compatible, isoelectric trapping device that provides isoelectric point (pI) based separations of complex mixtures of peptides. In MSWIFT, separation and analyte trapping are achieved by migrating the peptide ions through membranes having fixed pH values until the peptide pI is bracketed by the pH values of adjacent membranes. The pH values of the membranes can be tuned, thus affording a high degree of experimental flexibility. Specific advantages of using MSWIFT for sample pre-fractionation include: (i) small sample volumes (~200 μl), (ii) customized membranes over a large pH range, (iii) flexibility in the number of desired fractions, (iv) membrane compatibility with a variety of solvents systems and (v) resulting fractions do not require sample cleanup prior to MS analysis. Here, we demonstrate the utility of MSWIFT for mass spectrometry-based detection of peptides in improving dynamic range and the reduction of ion suppression effects for high-throughput separations of tryptic peptides.
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