Research Article

Surface Characterization of Phenylpropanolamine Drug by Inverse Gas Chromatography

Table 4

The specific component of the surface free energy (kJ/mol) for polar solutes on PPA.

Solute318.15 K323.15 K328.15 K333.15 K

DCM4.433.803.613.46
TCM2.071.411.321.50
AC3.263.313.273.21
THF2.702.041.531.65
EA4.082.362.352.44