Home › Analytical Chem › Characterization of Synthetic Polymers via Matrix Assisted Laser Desorption Ionization Time of Flight (MALDI-TOF) Mass Spectrometry
Analytical Chem JoVE (Open Access) Citable · DOI

Characterization of Synthetic Polymers via Matrix Assisted Laser Desorption Ionization Time of Flight (MALDI-TOF) Mass Spectrometry

DOI: 10.3791/57174-v
What you'll learn
  • ✓ Prepare polymer samples and optimize MALDI-TOF matrix selection for analysis
  • ✓ Configure mass spectrometry acquisition parameters for synthetic polymer characterization
  • ✓ Calibrate MALDI-TOF instrument and interpret molecular weight data
Protocol

A protocol for the matrix-assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF MS) characterization of synthetic polymers is described including the optimization of sample preparation, spectral acquisition, and data analysis.

Difficulty
intermediate
Total time
~2–3 hours per sample (including instrument setup and data acquisition)

Steps

1
Prepare polymer sample and optimize matrix

Dissolve synthetic polymer sample in appropriate solvent and select or optimize matrix compound for MALDI sample preparation. Mix polymer solution with matrix solution in optimal ratio on target plate.

▶ 00:33
2
Optimize data acquisition parameters

Configure laser power, ion source voltage, detector sensitivity, and other spectral acquisition settings to maximize signal-to-noise ratio and resolution for polymer molecular weight determination.

▶ 01:22
3
Calibrate MALDI-TOF mass spectrometer

Perform internal or external calibration using reference standards to ensure accurate mass-to-charge ratio (m/z) measurements across the relevant mass range for polymer analysis.

▶ 03:01
4
Analyze spectral data and interpret results

Process acquired mass spectra, identify molecular ion peaks, determine polymer molecular weight distribution, and extract structural information from fragmentation patterns.

▶ 04:14
5
Characterize poly(L-lactide) polymer by MALDI-TOF

Apply complete protocol to thiol-terminated poly(L-lactide) sample to demonstrate end-group identification and molecular weight determination in a real experimental example.

▶ 04:45
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