AssayIndex
Impurities & degradation

Sulfoxide

The +15.995 Da methionine oxidation product. Elutes earlier than the parent on reverse phase. A handling finding, not a synthesis finding.

Related terms

Oxidation
Addition of oxygen. Methionine to sulfoxide (+15.995) then sulfone (+31.990); tryptophan to oxindole and beyond; cysteine to sulfonic acid.

Where this term appears

The glossary exists to make record pages readable without a chemistry degree. Every technical term on a report resolves here.