What are the heavy amino acid residues in the PTMScan® Control Peptides?

The stable isotope is Carbon 13 and Nitrogen 15 in the carbon and nitrogen molecules of the bracketed Lysine (or Arginine) in the sequence.  Specifically the heavy lysine will be 13C6,15N2 for a 8.014199 Da mass shift from "normal" Lysine.  The heavy arginine will be 13C6,15N4 for a 10.00827 Da mass shift from "normal" Arginine.
 

Last updated: September 12, 2024