enviPat

enviPat calculates theoretical isotope patterns for mass spectrometry by computing exact masses and probabilities of isotopologues and pruning low-probability candidates to support interpretation of high-resolution experiments.

Key Features:

• Treelike structure: Derives subisotopologue sets for each element via transitions of single replacements of the most abundant isotope, organized into separable tree branches.
• Redundancy prevention: Prevents redundant isotopic replacements and enables initial detection of the most probable isotopologue to reduce unnecessary calculations.
• Parallelized prepruning: Applies a parallelized second phase with a relative-threshold mechanism to preprune large fractions of subisotopologues early.
• Exact mass and probability calculation: Computes exact masses and probabilities of relevant isotopologues across polyisotopic compounds.
• Validation and benchmarking: Benchmark simulations involving several thousand molecular formulas demonstrated that relative thresholds reduce distortion compared with absolute thresholds.

Scientific Applications:

• High-resolution mass spectrometry interpretation: Enables generation of theoretical isotope patterns for interpretation of high-resolution MS data.
• Proteomics: Supports isotope-pattern–based analyses in proteomics.
• Metabolomics: Supports isotope-pattern–based analyses in metabolomics.

Methodology:

Uses a treelike algorithm that generates subisotopologue sets by single-isotope replacements, detects the most probable isotopologue in an initial phase, then performs a parallelized second phase with relative-threshold prepruning; validation employed benchmark simulations of several thousand molecular formulas.