Mass spectrometry

Mass Spectrometry

The mass spectrometry group at the MPI for Polymer Research operates state-of-the-art instruments for sensitive detection of intact organic molecules, peptides, synthetic polymers and biopolymers with the emphasis on soft ionization techniques, such as ESI (electrospray ionization) and MALDI (matrix-assisted laser desorption/ionization). Besides characterization of intact molecules, the range of techniques includes proteomics, ion mobility separations and high-performance liquid chromatography as well as the investigation of organic materials using time-of-flight secondary ion mass spectrometry (ToF-SIMS).

Structure elucidation of complex macrocycles by collision induced dissociation ion mobility mass spectrometry
Structure elucidation of complex macrocycles by collision induced dissociation ion mobility mass spectrometry

The group performs institutional scientific service as well as research and method developments.

Service measurements are provided by ESI and MALDI and rapid reaction analysis can be done with user-friendly mass spectrometers in self-service after introductory training.

Analytical questions beyond routine are solved in scientific collaborations with internal and external partners.

Research and method developments comprise in particular fields, where mass spectrometry produces unique results or even acts as a stand-alone method. Examples are the development of solvent-free sample preparation for the analysis of insoluble and nonvolatile samples, such as giant PAHs (polycyclic aromatic hydrocarbons), soft-landing mass spectrometry of intractable compounds for STM (scanning tunneling microscopy) investigations beyond the existing limits, or structural elucidation of macrocycles and catenanes by ion mobility mass spectrometry.

Current research focuses on the development of methods for the detection and analysis of nanodiamonds as drug carriers in cells and tissue sections by mass spectrometric imaging with MALDI- and ToF-SIMS.

 

Instrumentation and Key Features

- rapifleX (Bruker) MALDI-ToF/ToF

soft ionization by matrix assisted laser desorption/ionization (MALDI)

mass range 100 - 500 000 Da

analysis of intact organic molecules and narrow dispersed polymers

fragment ion analysis

exact mass measurements < 20 ppm

MALDI imaging (lateral resolution up to 20 um)

- Synapt G2-Si (Waters) Q-IMS-ToF with MALDI and ESI

soft ionization by electrospray (ESI) and

matrix assisted laser desorption/ionization (MALDI)

analysis of intact organic molecules and monodisperse biomolecules by ESI > 100 000 Da

analysis of intact organic molecules and low molecular weight polymers by MALDI < 10 000 Da

exact mass measurements < 5 ppm

- Expression L CMS (Advion) Quadrupole MS with APCI

self service instrument for rapid measurements and reaction control

mass range 10 - 2000 Da

ionization by atmospheric pressure chemical ionization (APCI)

sample feeding by:

direct injection of dissolved samples

atmospheric pressure solids analysis probe (ASAP)

thin layer chromatography (TLC) plate reader

- Expression L CMS (Advion) Quadrupole MS with ESI

self service instrument for rapid measurements and reaction control

mass range 10 - 2000 Da

soft ionization by electrospray (ESI)

sample feeding by:

direct injection of dissolved samples

syringe pump

thin layer chromatography (TLC) plate reader

- TOF.SIMS NCS (ION-TOF) ToF-SIMS with integrated SPM Module

Surface spectrometry, mass resolution up to 10.000, mass range: sample dependent (standard 2000 m/z)

Detection of inorganic and organic components via ionized atoms, clusters, fragments, molecules

Surface mass spectrometric imaging (chemical mapping) of surfaces from 10x10 µm² up to 10x10 cm² @ lateral resolution from 0.1-5 µm

Depth profiling, layer elucidation @ nanometer depth resolution for predominantly organic layer systems

3D microarea analyses of 3D structured organic sample @ high lateral and vertical resolution

Low/high temperature measurements (150 – 700 K)

Conductive and non-conductive samples in UHV conditions

Typical applications:  surface characterization, layer structure elucidation, mapping of chemical distributions

 

Selected Publications

Zhang, W.; Chen, Z. P.; Yang, B.; Wang, X. Y.; Berger, R.; Narita, A.; Barin, G. B.; Ruffieux, P.; Fasel, R.; Peng, X. L.; Rader, H. J.; Mullen, K., Monitoring the On-Surface Synthesis of Graphene Nanoribbons by Mass Spectrometry. Analytical Chemistry 2017, 89 (14), 7485-7492.

Zhang, W.; Quernheim, M.; Rader, H. J.; Mullen, K., Collision-Induced Dissociation Ion Mobility Mass Spectrometry for the Elucidation of Unknown Structures in Strained Polycyclic Aromatic Hydrocarbon Macrocycles. Analytical Chemistry 2016, 88 (1), 952-959.

Zhang, W.; Andersson, J. T.; Rader, H. J.; Mullen, K., Molecular characterization of large polycyclic aromatic hydrocarbons in solid petroleum pitch and coal tar pitch by high resolution MALDI ToF MS and insights from ion mobility separation. Carbon 2015, 95, 672-680.

Przybilla, L.; Brand, J. D.; Yoshimura, K.; Rader, H. J.; Mullen, K., MALDI-TOF mass spectrometry of insoluble giant polycyclic aromatic hydrocarbons by a new method of sample preparation. Analytical Chemistry 2000, 72 (19), 4591-4597.

 
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