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Updated: May 18, 2026

Characterization of Synthetic Polymers via Matrix Assisted Laser Desorption Ionization Time of Flight (MALDI-TOF) Mass Spectrometry
Published on: June 10, 2018
Structural characterization of polyketides using high mass accuracy tandem mass spectrometry
Rebecca H Wills1, Manuela Tosin, Peter B O'Connor
1Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK.
Electron-induced dissociation (EID) and collision-activated dissociation (CAD) mass spectrometry techniques provide detailed structural insights into polyketides. EID generates more fragment ions than CAD, offering greater structural information for these important natural products.
Area of Science:
- Analytical Chemistry
- Natural Product Chemistry
- Mass Spectrometry
Background:
- Polyketides are a crucial class of natural products with significant therapeutic applications.
- Detailed structural characterization is essential for identifying and understanding polyketides and their derivatives.
Purpose of the Study:
- To compare electron-induced dissociation (EID) and collision-activated dissociation (CAD) for polyketide structural analysis.
- To investigate the influence of different cations on fragmentation patterns.
- To explore the utility of combined MS(3) experiments for isomer differentiation.
Main Methods:
- Tandem mass spectrometry techniques: EID and CAD.
- Analysis of polyketide natural products: erythromycin A, lasalocid A, and iso-lasalocid A.
- Investigation of precursor ions with various bound cations ([M + H]+, [M + Na]+, [M + Li]+, [M + NH4]+).
Main Results:
- EID produced a greater number of fragment ions compared to CAD, yielding more structural information.
- Lithium adducts ([M + Li]+) exhibited the highest degree of fragmentation, facilitating detailed isomer analysis.
- Multistage mass spectrometry (MS(3)) experiments on lithiated species successfully distinguished between isomers.
Conclusions:
- EID offers enhanced structural information for polyketides compared to CAD.
- The choice of cation significantly impacts fragmentation, with lithium adducts being particularly informative.
- Combining EID and CAD in MS(3) is a powerful strategy for distinguishing polyketide isomers and characterizing novel compounds.
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