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MALDI-TOF Mass Spectrometry01:19

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Characterization of Synthetic Polymers via Matrix Assisted Laser Desorption Ionization Time of Flight MALDI-TOF Mass Spectrometry
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Quantitative Analysis of Polymers by MALDI-TOF Mass Spectrometry: Correlation Between Signal Intensity and Arm

Mete-Sungur Dalgic1, Sourabh Kumar1, Steffen M Weidner1

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Journal of Mass Spectrometry : JMS
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Polymer architecture significantly impacts ionization in MALDI-TOF mass spectrometry. Star-shaped polymers show higher signal intensities than linear ones, with more arms leading to greater ionization.

Keywords:
MALDI TOF MSpolymersquantificationtopology

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Area of Science:

  • Polymer Chemistry
  • Analytical Chemistry
  • Mass Spectrometry

Background:

  • Understanding polymer ionization is crucial for accurate mass spectrometry analysis.
  • Polymer architecture, including branching and shape, can influence ionization efficiency.
  • Matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) is a key technique for polymer characterization.

Purpose of the Study:

  • To investigate the effect of polymer architecture (linear vs. star-shaped) on ionization efficiency in MALDI-TOF.
  • To determine how the number of arms in star-shaped polymers influences their signal intensity.
  • To compare the ionization behavior of poly(L-lactides) (PLA) and poly(ethylene oxides) (PEO) with varying architectures.

Main Methods:

  • Preparation and analysis of binary and ternary polymer blends (PLA and PEO).
  • Comparison of signal intensities between linear and star-shaped polymers of similar molecular masses.
  • Investigation of polymers with different numbers of arms (e.g., three-arm vs. four-arm PLA).
  • Computational calculation of binding energies for polymer-K+ adduct ions.

Main Results:

  • Star-shaped polymers consistently exhibited higher signal intensities than linear counterparts in equimolar blends.
  • Increased number of arms in star-shaped PLA led to higher signal intensities (four-arm > three-arm).
  • Ionization differences were attributed to polymer architecture rather than end-group modifications.
  • Calculated binding energies indicated slightly higher values for star-shaped lower mass oligomers.

Conclusions:

  • Polymer architecture, specifically the number of arms, is a significant factor affecting ionization in MALDI-TOF.
  • Star-shaped polymers are preferentially ionized over linear ones due to their architecture.
  • These findings provide insights into optimizing MALDI-TOF analysis for complex polymer structures.