Abstract
Edman degradation is a well-known method for obtaining amino acid (AA) sequences from a peptide by means of sequential reactions that release the N-terminal AAs from the peptide as a phenylthiohydantoin (PTH) derivative. Because of unexpected loss during the reaction and handling, there are few reports of use of this reaction for quantification. This manuscript describes the development of isotope-dilution liquid chromatography–electrospray ionization tandem mass spectrometry for 20 PTH-AA derivatives, and long-term stability testing of PTH-AAs to ensure quantitative quality in the reaction. The 20 corresponding [13C6]-PTH-AAs were prepared by use of a one-pot reaction involving a mixture of [13C6]-Edman reagent and 20 AAs. Good linearity was observed for standard curves for the PTH-AAs, using the corresponding [13C6]-PTH-AAs as internal standards (1–100 pmol per injection, r 2 = 0.989–1.000). Serum albumin (human), pepsin (porcine stomach mucosa), α-casein (bovine milk), ribonuclease A (bovine), lysozyme (chicken egg white), and insulin (bovine) subjected to Edman degradation were examined as model proteins and peptides for N-terminal AA analysis. The results of the impurity test were satisfactory. Yield from the entire reaction with human serum albumin was estimated to be at least 75 %, indicating great potential for absolute quantification of proteins without protein standards.

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Acknowledgments
This work was supported in part by the Asahi Glass Foundation through a grant to T.O. (2010–2011, “Novel analytical platform to enable both absolute quantification and identification of unknown proteins in biological samples”) and through their continuing support for the restoration of our laboratories damaged by the Great East Japan Earthquake. The authors also thank Shionogi & Co., Ltd. (Osaka, Japan), Astellas Pharma Inc. (Tokyo, Japan), and Professor Ian A. Blair (University of Pennsylvania, Philadelphia, PA) for donating two used TSQ 7000 s and an LCQ Deca, respectively.
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Published in the topical collection Amino Acid Analysis with guest editor Toshimasa Toyo’oka.
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Satoh, R., Goto, T., Lee, S.H. et al. Can Edman degradation be used for quantification? Isotope-dilution liquid chromatography–electrospray ionization tandem mass spectrometry and the long-term stability of 20 phenylthiohydantoin-amino acids. Anal Bioanal Chem 405, 8001–8010 (2013). https://doi.org/10.1007/s00216-013-6901-6
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DOI: https://doi.org/10.1007/s00216-013-6901-6


