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Tandem Mass Spectrometry Reflects Architectural Differences in Analogous, Bis-MPA-Based Linear Polymers,
Kayla Williams-Pavlantos1, McKenna J Redding2, Oluwapelumi O Kareem2
1Department of Chemistry, University of Akron, Akron, Ohio 44325, United States.
Journal of the American Society for Mass Spectrometry
|November 8, 2024
Summary
Tandem mass spectrometry (MS/MS) effectively distinguishes between dendrimers, hyperbranched polymers, and linear polymers. Unique fragmentation patterns reveal distinct macromolecular structures, aiding in polymer characterization.
Area of Science:
- Polymer Chemistry
- Analytical Chemistry
- Materials Science
Background:
- Branched polymers are increasingly utilized in diverse industrial and technological fields.
- Accurate determination of macromolecular structure is crucial for understanding polymer properties.
- Distinguishing between different polymer architectures (linear, hyperbranched, dendrimer) is challenging.
Purpose of the Study:
- To investigate and compare the tandem mass spectrometry (MS/MS) fragmentation patterns of dendrimers, hyperbranched polymers, and linear polymers.
- To establish MS/MS fragmentation as a reliable method for differentiating these macromolecular architectures.
- To correlate specific fragmentation behaviors with the unique structural characteristics of each polymer type.
Main Methods:
- Synthesis of linear, hyperbranched, and dendrimeric polymers utilizing analogous 2,2-bis(hydroxymethyl)propionic acid (bis-MPA) backbone groups.
- Analysis of synthesized polymers using tandem mass spectrometry (MS/MS) to study fragmentation pathways.
- Comparative analysis of fragment ion distributions and patterns specific to each polymer architecture.
Main Results:
- Linear polymers exhibited random backbone cleavages, yielding diverse fragment ion distributions.
- Hyperbranched polymers preferentially fragmented at branching sites, resulting in multiple isomer-dependent distributions.
- Dendrimers displayed a unique fragmentation pattern characterized by high molecular weight fragment ions, serving as a structural signature.
Conclusions:
- Dendrimers, hyperbranched polymers, and linear polymers exhibit distinct and individualized MS/MS fragmentation behaviors.
- These differences in fragmentation are directly attributable to variations in their primary structures and architectures.
- Tandem mass spectrometry is a powerful and effective analytical tool for distinguishing between these complex macromolecular architectures.
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