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Table 2 Typical peak absorption frequencies associated with cystine oxidation products [3, 10]

From: Developing a non-invasive tool to assess the impact of oxidation on the structural integrity of historic wool in Tudor tapestries

Chemical functional group Chemical names Wavenumber (cm−1)
–SO2–S– Cystine dioxide (CD) 1121
–SO–S– Cystine monoxide (CM) 1071
\({\text{SO}}_{3}^{ - }\) Cysteic acid (CA) 1040
–S–\({\text{SO}}_{3}^{ - }\) S-sulfonate 1022