Fig. 2.

Metal-enhanced multidimensional epimeric monomer discrimination. Group 1 (a–c): short neuropeptides 1–5; Group 2 (d–f): long neuropeptides 6–10; Group 3 (g–i): Aβ N-terminal fragments 11–12 and Group 4 (j–l): Aβ C-terminal fragments 13. With the increase of separation dimensions (sequential binding with Cu²⁺), significantly improved separation efficiency is achieved for a wide range of neuropeptides and Aβ fragments (30 in total). All CCS data denote average values (n = 3). Source data are provided as a Source Data file