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Four types of information have been taken into account to calculate delta m/z in PRIDE Inspector:

The calculation can be broken down into the following steps:

1. Calculate peptide mass: simply sum the masses of all the amino acids in the peptide.

2. Calculate PTM mass: simply sum the masses of all the post translational modifications in the peptide.

3. Calculate theoretical mass: [Peptide mass - PTM mass - 18 dalton].

4. Calculate precursor mass: [(Precursor m/z * Precursor charge) - (Precursor charge * 1 dalton)].

5. Calculate detla m/z: [(Precursor mass - Theoretical mass)/Precursor charge].

See Also

Other topics: