pyMacroMS

High performance quantification of complex high resolution polymer mass spectra

The purpose of this program is to identify and quantify macromolecular species in high resolution mass spectra based on the used monomer(s), possible end-groups and the adduct ion. Experimental spectra are imported as a centroided peaklist from a comma-separated values (csv) file or directly from a Thermo RAW file (from v1.0.0). Please find code for example usage on our webpage.

From version 1.0.0, pyMacroMS requires a 64-bit version of Python.

Dependencies

pyMacroMS requires the following modules to be installed:

• IsoSpecPy for the generation of isotopic patterns
• numpy and pandas for data processing
• sklearn for quantification via linear regression
• matplotlib for quick representation of results
• progressbar2 for feedback during the more time consuming steps
• reportlab and svglib for the generation of a PDF report
• pythonnet for the interface with Thermo's RawFileReader

Citation

Please refer to our publication for more details about the algorithm and cite us when using pyMacroMS in your work:

K. De Bruycker, T. Krappitz, C. Barner-Kowollik, ACS Macro Lett. 2018, 1443-1447.

License

• pyMacroMS is available free of charge under an MIT License. See the LICENCE file for more details.
• pyMacroMS uses the RawFileReader reading tool. Copyright © 2016 by Thermo Fisher Scientific, Inc. All rights reserved. If you use pyMacroMS, you agree to the license agreement of RawFileReader, of which a copy is provided when installing pyMacroMS.

Changelog

1.1.7

• Now works with IsoSpecPy 2.x, tested with 2.1.4, but does not work with IsoSpecPy 1.x any more. Special thanks to the developers, Mateusz Lacki and Michal Startek, for their help with the implementation.
• Further speed improvements
• Minor bugfixes

1.1.0

• Speed improvements for assembling the possible monomer combinations in the polymer simulation. Special thanks to Matthieu Soete for sharing his insights.
• Preparations for a GUI

1.0.9

• Introduced basic support for Scan Filters (limit the imported data to 1 type of scan). Different scan types are detrimental for the averaging algorithm and probably don't make much sense anyway (?)
• Increase compatibility with Unix systems, installation of pythonnet package seems to be the major struggle though
• MSData class now takes the argument mzOffset, an offset that is added to every m/z value when reading the spectrum.
• Speed improvements for a large amount of possible compositions
• Minor bugfixes

1.0.0

• Thermo RAW files can now be used as input without any pre-processing
  • By default, all scans are imported separately
  • Scans can be averaged by providing a range of scans or retention times
• New MSData class introduced
  • Handles reading of csv files (previously Spectrum class) and Thermo RAW files
  • Stores all imported spectra and corresponding processed results to allow for batch processing of multiple scans
  • Post-processing of results still in Spectrum class, so on a per-scan base... Future problem
• Version 1.0.0 and onwards are licensed under an MIT License (rather than a GNU GPL v3.0 for older versions) to comply with the license requirements of Thermo's RawFileReader

0.2.0

• Isobaric species are now pre-filtered, which leads to a significantly improved calculation time
• Introduced the option to define a custom database of monomers/endgroups (with a higher priority than the built-in database)
• Introduced the option to save the output as a PDF report

0.1.2

• Update code to use the new IsoSpecPy 1.9.X API

0.1.1

• Minor fixes to the interfacing with IsoSpecPy
• Fixed compatibility with IsoSpecPy 1.9.X

0.1.0

• Initial release