... understanding life in molecular detail

Chemical Modification Mass Calculator

This calculator will calculate and present the molecular masses of the various protein species along the path to protein containing unnatural amino acids using the double alkylation-elimination method using DiBr.

Molecular mass of native protein:
Chose which residue type is mutated to cysteine:
Enter the empirical formula of the modifying thiol:
No of C atoms
No of H atoms
No of O atoms
No of N atoms
No of P atoms
No of S atoms