Gly-Pro-pNA is a chromogenic substrate specifically cleaved by dipeptidyl peptidase IV (DPP IV), an enzyme present in circulation. The enzymatic activity can be measured colorimetrically by detecting the release of p-nitroanilide at 405 nm. DPP IV plays a critical role in inactivating two key peptides, glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide 1 (GLP-1), which are essential for nutrient-stimulated insulin secretion. This substrate is particularly useful for screening DPP IV inhibitors, which are being explored as potential antidiabetic therapeutics.

Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to 24 months.
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20°C. Generally, these will be useable for up to one month. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.