AMPPD (Lumi-Phos Plus; Lumigen PPD) is a chemiluminescent substrate for alkaline phosphatase (APase). AMPPD is hydrolyzed by APase to generate an unstable dioxetane intermediate, and the intermediate releases a chemiluminescent signal when it decomposes. The luminescent signal of AMPPD can be detected by highly sensitive equipment, thereby achieving quantitative analysis of the target molecule. AMPPD can be used in ultrasensitive enzyme-linked immunosorbent assays (such as quantitative detection of human tissue kininogen), chemiluminescent detection of proteins and nucleic acids, and other fields.