Fig. 3

MS and MS/MS spectra collected in negative ion mode showing the ionization and fragmentation of cellobiose (A) and 2³-(4-O-methyl-α-D-glucuronyl)-xylotriose (U^4m2XX) (B) after oxidation by TmXdhA. A1. Negative MS spectra of solely cellobiose, A2. Negative MS spectra of the reaction products from TmXdhA cellobiose reaction, and A3. MS/MS 357 of TmXdhA oxidized cellobiose. B1. MS spectra of U^4m2XX, B2. MS spectra of TmXdhA U^4m2XX reaction products, B3. MS/MS 619 of TmXdhA oxidized U^4m2XX, and B4. MS/MS 309 of TmXdhA oxidized U^4m2XX