Figure 5.

(A) LDI/MALDI–FTICR MS spectrum of AuNP functionalized with tetramannoside-based ligand. The tetramannoside-based ligand was detected as [M + H]⁺, and [M + Au]⁺ at low intensity, and detected as [M + Na]⁺, [M–SH₂ + Na]⁺ and [M–S + O + Na]⁺ at higher intensities. (B) Structure characterization performed by CID confirmed the identity of these species. Fragmentation of [M + Au]⁺ allowed characterization of the carbohydrate moiety of the ligand, whereas CID analysis of [M + Na]⁺ provided more information on the structure of the linker. Yellow circles indicate gold-linked fragment ions.