Abstract
Peptidomics has emerged as a new discipline in recent years. Mass spectrometry (MS) is the most universal and efficient tool for structure identification of proteins and peptides. However, there is a limitation for the identification of peptides with the same amino acid composition but different sequences because these peptides have identical mass spectra of molecular ions. This paper presents a high performance liquid chromatography-electrospray ionization-mass spectrometry (HPLC-ESI-MS) method for the separation of small molecular peptides with the same amino acid composition but different sequences. Two tripeptides of Gly-Ser-Phe and Gly-Phe-Ser were used as a model sample. The separation behavior has been investigated and the separation conditions have been optimized. Under the optimum conditions, good repeatability was achieved. The developed method could provide a helpful reference for the separation of other peptides with the same amino acid composition but different sequences in the study of proteomics and peptidomics.
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Supported by the National Natural Science Foundation of China (Grant Nos. 20775055 & 90817103) and the Start-up Funding for ZC’s Luojia Chair Professorship of Wuhan University (Grant No. 306276216)
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Liu, L., Chen, Z. Separation of small molecular peptides with the same amino acid composition but different sequences by high performance liquid chromatography-electrospray ionization-mass spectrometry. Sci. China Ser. B-Chem. 52, 2264–2268 (2009). https://doi.org/10.1007/s11426-009-0232-7
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DOI: https://doi.org/10.1007/s11426-009-0232-7