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Strategy for peptide quantification using LC-MS in regulated bioanalysis: case study with a glucose-responsive
Yang Xu1, Dina Goykhman1, Ming Wang1
1Pharmacokinetics, Pharmacodynamics & Drug Metabolism, Regulated Bioanalysis, Merck & Co., Inc., 770 Sumneytown Pike, WP75B-300, West Point, PA 19486, USA.
Liquid chromatography-tandem mass spectrometry (LC-MS/MS) offers advanced peptide quantification but faces challenges. This study presents a validated LC-MS/MS strategy for hybrid assays, exemplified by glucose-responsive insulin (MK-2640).
Area of Science:
- Analytical Chemistry
- Biotechnology
- Pharmacology
Background:
- Traditional ligand-binding assays are being replaced by LC-MS/MS for peptide quantification.
- LC-MS/MS presents challenges in sensitivity, specificity, and ruggedness, particularly for hybrid assay formats.
- Regulatory guidance for LC-MS/MS hybrid assays is lacking.
Purpose of the Study:
- To present a robust strategy for LC-MS/MS method development and assay validation.
- To address the challenges associated with hybrid assay formats in peptide quantification.
- To provide a case study using MK-2640, a glucose-responsive insulin, in various matrices.
Main Methods:
- Method development and assay validation strategy for LC-MS/MS.
- Application of immunoaffinity purification for rat/dog GLP studies.
- Solid-phase extraction (SPE) for clinical studies.
- Quantification of intact MK-2640.
Main Results:
- Successful development and validation of an LC-MS/MS method for MK-2640.
- Demonstrated applicability of the strategy across multiple biological matrices.
- Immunoaffinity purification and SPE effectively supported different study types.
Conclusions:
- The presented strategy provides a framework for developing and validating LC-MS/MS assays for peptide quantification.
- The approach is suitable for hybrid assay formats and complex matrices.
- This work aids in navigating regulatory challenges for advanced peptide analysis.
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