Inclusion Complexation of 4-Biphenylacetic Acid with β-Cyclodextrin

The preparation of an inclusion complex of 4-biphenylacetic acid (BPAA), a non-steroidal antiinflammatory drug, with β-cyclo-dextrin is described. The presumible structure of the inclusion system, the molar ratio, which was found 1:1, and the formation constant were calculated by the analysis of IR, UV, DSC, X-ray diffraction, and 1H-NMR. Dissolution rate and solubility were also studied. BPAA solubility in water resulted significantly (4,2-fold) increased by complexation, such as its dissolution rate which appears, in the first 12 min, 18 times greater for the complex than the drug alone.