 The study determined the solubility of citagliptin phosphate in SCCO2 at different temperatures and pressures, finding solubilities ranging from 3.02 times 10 to 5 to 6.98 times 10 to 5 mole fraction. The data was correlated with existing density models and a new association model. This article was authored by Nadasadat Sardati Adasthani, Seda Lisa Jadian, Nadia Esfandiari, and others.