Survey of peptide quantification methods and comparison of their reproducibility: A case study using oxytocin

USP’s peptide reference standards content is typically determined using an HPLC assay against an external standard for which the purity was determined by a mass balance approach. To explore the use of other analytical methods, the USP Biologics Department conducted a multi-laboratory collaborative s...

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Bibliographic Details
Published in:Journal of pharmaceutical and biomedical analysis 2019-03, Vol.166, p.105-112
Main Authors: Li, Chensheng, Bhavaraju, Sitaram, Thibeault, Marie-Pier, Melanson, Jeremy, Blomgren, Andreas, Rundlöf, Torgny, Kilpatrick, Eric, Swann, Carolyn J., Rudd, Timothy, Aubin, Yves, Grant, Kevin, Butt, Margaret, Shum, WaiKei, Kerim, Tursun, Sherwin, William, Nakagawa, Yukari, Pavón, Sergi, Arrastia, Silvia, Weel, Tim, Pola, Arunima, Chalasani, Dinesh, Walfish, Steven, Atouf, Fouad
Format: Article
Language:English
Subjects:
Amino acid analysis (AAA)
Amino Acids - analysis
Chemistry Techniques, Analytical - methods
Chromatography, High Pressure Liquid
HPLC
Magnetic Resonance Spectroscopy
NMR
Oxytocin - analysis
Peptide
Quantification
Reference Standards
Reproducibility of Results
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Summary:USP’s peptide reference standards content is typically determined using an HPLC assay against an external standard for which the purity was determined by a mass balance approach. To explore the use of other analytical methods, the USP Biologics Department conducted a multi-laboratory collaborative study. The study determined the inter-laboratory variability for peptide quantitation using the following methods: HPLC assay, quantitative nuclear magnetic resonance (qNMR) spectroscopy, or amino acid analysis (AAA). The three methods were compared with regard to their suitability for quantitation of the nonapeptide oxytocin. In this study, the HPLC assay method using the same peptide bulk material as the standard showed the lowest inter-lab variability. The coefficient of variation (%CV) was calculated without counting the uncertainty associated with the purity assignment of the standard with mass balance. The proton qNMR method is a direct measurement of the peptide against an internal standard, which is not difficult to perform under common laboratory conditions. Because of the simpler operation and shorter analytical time, qNMR as a primary method for peptide reference standard value assignment deserves further exploration.
ISSN:0731-7085
1873-264X
DOI:10.1016/j.jpba.2018.12.028