esimsa

esimsa deconvolutes complex electrospray ionization (ESI) mass spectrometry spectra from Fourier transform ion cyclotron resonance (FTICR) instruments to extract isotopic clusters and accurate monoisotopic masses for analysis of biological samples.

Key Features:

• High-Resolution Data Handling: Processes data acquired on a 9.4 Tesla FTICR mass spectrometer with ultra-high resolving power and mass accuracy.
• Automated Deconvolution: Employs algorithms to deconstruct complex spectra, reducing thousands of peaks into distinct isotopic clusters and unique masses.
• Precision Mass Measurement: Reports mass measurements with errors typically distributed normally around a standard deviation of 1.7 ppm.
• Tryptic Digest Analysis: Supports analysis of tryptic digests from protein mixtures, including equine cytochrome c, equine myoglobin, and bovine serum albumin.
• Complex Matrix Handling: Capable of processing spectra derived from complex biological matrices such as human plasma.
• Mass Matching: Matches observed masses to known tryptic fragments to support protein identification and sequence coverage assessment.

Scientific Applications:

• Protein Analysis: Analysis of tryptic digests of protein mixtures for identification and characterization of component proteins.
• Complex Biological Matrices: Deconvolution of FTICR spectra from human plasma to reduce peak complexity and recover isotopic clusters and unique masses.
• Protein Identification: Matching observed monoisotopic masses with known tryptic fragments to achieve high sequence coverage in proteomics studies.
• Proteomics Research: Enables detailed mass spectrometry–based analysis of complex biological samples for molecular-level investigations.

Methodology:

Data are acquired using FTICR mass spectrometry; computational algorithms deconvolute spectra into isotopic clusters and unique masses; identified masses are matched to known protein tryptic fragments.