Fig. 6

Negative ion mode CID-MS/MS fragmentation patterns of C4-oxidized tamarind seed xyloglucan (TXG) oligosaccharides present in the NcLPMO9C-TXG-digest annotated as _O=GGXXX (m/z 1059.4, a) and _O=GGXLX (m/z 1221.5, b). _O=G indicates that the oxidation is on the glucosyl unit in keto-form. Oxidation of the C4-carbon position is indicated in red. The fragments are annotated according to the nomenclature proposed by Domon and Costello [49]. The m/z-values shown in grey in b are from the other co-eluted isomers