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Updated: Mar 25, 2026

MALDI-ToF MS Method for the Characterization of Synthetic Polymers with Varying Dispersity and End Groups
Published on: October 3, 2025
Quantification of permanent positively charged compounds in plasma using one-step dilution to reduce matrix effect in
Wei Zhou1, Xiaoli Wu1, Jing Li1
1Drug Development Core, Faculty of Health Sciences, University of Macau, Macau SAR, PR China.
Background:
Bioanalysis of conventional methods for compounds with permanent positive charge leads to peak tailing in separation and matrix effects in MS. This study describes a novel, rapid and sensitive method for quinolinium-containing compounds quantification. Results & methodology: A charged surface hybrid chromatography-tandem MS/MS using one-step protein precipitation dilution technique has been developed for determining analytes in plasma. We found symmetric peak and high recoveries for the analytes without matrix effect. All calibration curves had good linearity (r 0.991). The intra- and inter-assay precision was within 15% and the accuracy ranged from 88 to 103%. The method has been successfully applied to the PK study.
Conclusion:
The proposed method was sensitive, reproducible and applicable to other permanent positively charged compounds.
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