Treatment of a peptide which contains disulfide linkages with peroxyformic acid yields a peptide which contains what new amino acid residue?

Question

Quizplus · Accepted Answer

Peroxyformic acid can oxidize cysteine residues in a peptide to cysteic acid, which contains a carboxylic acid group in addition to the thiol group present in cysteine. Therefore, the treatment would result in the addition of cysteic acid residues to the peptide, not a new amino acid residue.

Treatment of a Peptide Which Contains Disulfide Linkages with Peroxyformic