a strong oxidizing agent, useful in protein chemistry for cleavage of any disulfide bond, R−S−S−R′, to the corresponding pair of sulfonic acid groups, R−SO3H + R′−SO3H, e.g. of a cystine residue to two cysteic‐acid residues, an organic peracid used in cleaving disulfide links in peptides by oxidizing cysteine and cystine to cysteic acid
