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Updated: Feb 18, 2026

An HS-MRM Assay for the Quantification of Host-cell Proteins in Protein Biopharmaceuticals by Liquid Chromatography Ion Mobility QTOF Mass Spectrometry

An HS-MRM Assay for the Quantification of Host-cell Proteins in Protein Biopharmaceuticals by Liquid Chromatography Ion Mobility QTOF Mass Spectrometry

Published on: April 17, 2018

Improving the selectivity and sensitivity for quantifying 8-α-hydroxy-mutilin in rabbit tissues by using basic mobile

Aimin Tan¹, Guifen Gu¹, Xuan Gui¹

¹Nucro-Technics, Scarborough, ON, Canada.

Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences

|November 21, 2017

Summary

A new LC-MS/MS method improves quantification of 8-α-hydroxy-mutilin, a tiamulin residue marker, in rabbit tissues. This method uses a novel true MRM transition for enhanced selectivity and sensitivity in residue depletion studies.

Keywords:

8-α-hydroxy-mutilin LC–MS Rabbit Tiamulin Tissue

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Area of Science:

Analytical Chemistry
Pharmacokinetics
Veterinary Drug Residue Analysis

Background:

Quantifying 8-α-hydroxy-mutilin, a tiamulin marker residue, in tissues is crucial for food safety.
Previous LC-MS methods suffered from suboptimal selectivity and sensitivity due to pseudo MRM transitions.

Purpose of the Study:

To develop and validate a highly sensitive and selective LC-MS/MS method for quantifying 8-α-hydroxy-mutilin in rabbit tissues.
To establish a reliable analytical method for supporting residue depletion studies.

Main Methods:

Utilized electrospray negative ionization in a basic medium to discover a true MRM transition (m/z 335→179).
Developed and validated a liquid chromatography-tandem mass spectrometry (LC-MS/MS) method using pleuromutilin as an internal standard.
Quantified 8-α-hydroxy-mutilin in rabbit muscle, liver, kidney, and fat tissues.

Main Results:

A novel, highly selective and sensitive true MRM transition (m/z 335→179) was identified for 8-α-hydroxy-mutilin.
The developed LC-MS/MS method demonstrated significant improvements in selectivity and sensitivity compared to previous methods.
Validated method showed excellent accuracy (-5.0 to 3.1% bias) and precision (2.2 to 8.3% CV) within the 0.2-10 ppm range.

Conclusions:

The novel LC-MS/MS method provides a robust and sensitive approach for quantifying tiamulin residue marker 8-α-hydroxy-mutilin in rabbit tissues.
The validated method is suitable for supporting Good Laboratory Practice (GLP) tissue residue depletion studies.
This advancement enhances the reliability of analytical data in veterinary drug residue analysis.