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. 2013 Aug 10;19(5):448–464. doi: 10.1089/ars.2012.4565

FIG. 3.

FIG. 3.

ESI-MS spectra and Raman bands showing hydrogen sulfide-induced cleavage of the S–S bond in the model chemical of Cys–Cys. (A) ESI-MS spectra of Cys–Cys in the absence or presence of NaHS or ascorbic acid. (B) Raman spectroscopy showing the bands for the S–S bond and the SH group. (C, D) ESI-MS spectra showing the effect of hydrogen sulfide on the S–S bond at pH values of 7.0 or 5.5. (E) ESI-MS spectra showing a recovery of the S–S bond after washout of hydrogen sulfide. ESI-MS, Electrospray ionization mass spectrometry.