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

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