Abstract
Various additives viz. hydrotropes, bile salts, fatty acid and cyclodextrin effect on the cloud point (CP) behavior of amphiphilic drug promazine hydrochloride (PMZ) in 1mmoldm−3 14-4-14+10mmoldm−3 sodium phosphate (SP) buffer solutions have been investigated in the present study. These various additives are usually used as pharmaceutical excipients. The additives like anionic hydrotropes, bile salts and fatty acid salts increase the CP of PMZ, when added in low concentrations, whereas at high concentration, decrease it. Cationic and nonionic hydrotropes increase the CP of PMZ solutions at all concentration. Cyclodextrin behave like simple sugar is found to decrease the CP of the drug solutions at all concentrations. Gemini surfactant (14-4-14) has been found a better surfactant that can prevent clouding under physiological condition. It can thus be used as a drug-carrier system that increases the storage stability. The thermodynamic parameters are also evaluated: where ΔGco is found to be negative and ΔHco and TΔSco values are negative as well as positive depending upon type and nature of additive.
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