“…Djordjevic et al43 also performed an investigation of water adsorption on ketotifen fumarate by IGC in the temperature range 343–383 K. The entropy of adsorption and the isoteric heats of adsorption indicated a specific interaction between water and ketotifen fumarate. The loss of more than one degree of freedom for the adsorbed water molecule on the solid surface, shown by the change in the standard entropy of adsorption (Δ S A 0 ) was thought by the authors to be clear evidence of a strong intermolecular interaction on the surface.…”