Fig. 4. Specific detection of Amadori-DPPE, CM-DPPE and CE-DPPE standards using MS/MS. (A) Product ion spectrum of the [M + H]⁺ ion at m/z 854.1 of Amadori-DPPE. (B) Product ion spectrum of the [M + H]⁺ ion at m/z 750.1 of CM-DPPE. (C) Product ion spectrum of the [M + H]⁺ ion at m/z 764.0 of CE-DPPE.