Identification and Quantification of Structurally Related Peptide Impurity in Linaclotide by Liquid
Jinlan Cheng1,2, Tianji Zhang2, Xinling Cui2
1School of Pharmacy, China Medical University, Shenyang, China.
Rapid Communications in Mass Spectrometry : RCM
|January 15, 2026
Summary
A new liquid chromatography-high resolution mass spectrometry (LC-HRMS) method detects impurities in linaclotide, a drug for irritable bowel syndrome with constipation (IBS-C). This sensitive method ensures the quality and safety of peptide therapeutics.
Area of Science:
- Analytical Chemistry
- Pharmaceutical Science
- Biochemistry
Background:
- Linaclotide is a crucial peptide therapeutic for treating irritable bowel syndrome with constipation (IBS-C).
- Structurally related impurities can arise during linaclotide synthesis, storage, or transport, potentially compromising drug quality and patient safety.
- Sensitive detection methods are vital for ensuring the purity and efficacy of peptide therapeutics like linaclotide.
Purpose of the Study:
- To develop and validate a highly sensitive analytical method for identifying and quantifying structurally related peptide impurities in linaclotide.
- To apply the developed method for characterizing impurities in linaclotide samples from various manufacturers.
- To enhance quality control strategies for peptide therapeutics through accurate impurity profiling.
Main Methods:
- Development of a liquid chromatography-high resolution mass spectrometry (LC-HRMS) method.
- Direct analysis of linaclotide samples using an Orbitrap mass spectrometer with an electrospray ionization (ESI) source in positive ion mode.
- Utilization of tandem mass spectrometry with collision-induced dissociation and high mass accuracy for impurity identification and quantification.
Main Results:
- The LC-HRMS method successfully characterized peptide impurities in linaclotide samples.
- In manufacturer A's linaclotide, [Des-Tyr14]-linaclotide was quantified at 0.453 mg/g.
- Manufacturer B's linaclotide contained [Des-Tyr14]-linaclotide (0.768 mg/g) and [endo-Ala9]-linaclotide (0.555 mg/g).
Conclusions:
- The developed LC-HRMS method effectively addresses the challenge of detecting structurally related peptide impurities in linaclotide.
- The method's capability in characterizing specific impurities offers a significant advancement for quality control in peptide drug manufacturing.
- This analytical approach provides a valuable tool for ensuring the safety and quality of linaclotide and similar peptide therapeutics.
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