MobCal-MPI

MobCal-MPI calculates collision cross sections (CCS) of ions and molecules using parallel computation to enable structural elucidation of gas-phase ions and characterization of complex mixtures.

Key Features:

• Parallel Computing: MobCal-MPI leverages parallelized computing to accelerate CCS calculations, achieving up to 64-fold speed improvements compared to traditional packages.
• Atom-Specific Parameters: It employs atom-specific parameters derived from the MMFF94 forcefield to tune ion-nitrogen van der Waals potentials for CCS computations.
• Calibration and Validation: The method was calibrated on 162 molecules with a root mean square error (RMSE) of 2.60% and externally validated on 50 compounds with an RMSE of 2.31%.
• Extensibility: Based on MMFF94, it can be extended to include additional elements including Li, Na, K, Si, Mg, Ca, Fe, Cu, and Zn.

Scientific Applications:

• Theoretical–Experimental CCS Comparison: Bridging theoretical modeling of chemical structures with experimental collision cross section determinations.
• Structural Studies with IMS–MS: Supporting structural elucidation of gas-phase ions using ion mobility spectrometry coupled to mass spectrometry.
• Complex Mixture Characterization: Facilitating characterization of complex molecular mixtures through rapid and precise CCS predictions.
• Omics and Pharmaceutical Research: Applied in proteomics, metabolomics, and pharmaceutical research for structural and compositional analyses.

Methodology:

Parallelized computation (MPI) with atom-specific parameters from the MMFF94 forcefield to model ion–nitrogen van der Waals interactions, calibrated on 162 molecules and externally validated on 50 compounds.