Figure 3.
MS/MS spectrum of the mono-deacetylated product (ADAAA) from the PcCDA reaction with (GlcNAc)5. The reaction mixture contained mainly mono-deacetylated product and traces of di-deacetylated product. The mixture was subjected to the procedure reported in40. After reducing-end labelling with H2(18O), the sample was analyzed by UHPLC-ESI-MS2. Fragmentation spectrum of the mono-deacetylated product (A4D118O): b-ions are fragments from the non-reducing end, and y-ions are fragments from reducing end with the 18O label.