DPP4 and Alzheimer disease: Inhibitory activities against the key enzymes relevant to obesity (lipase), diabetes (α-amylase, α-glucosidase, and DPP-IV), Alzheimer’s disease (AChE, BChE, and BACE-1), and hypertension (ACE) were investigated using the fresh sample and OCPs extracted under the optimal extraction condition, as shown in Table 7.