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Short Communication Open Access
The present study was undertaken to examine the effect of pH and concentration of hydroxypropyl-β -cyclodextrin on the solubility of carvedilol as it shows pH-dependent solubility. The equilibrium solubility of carvedilol in a series of solutions of varying pH (from 1.2 to 11) was determined and compared with the equilibrium solubility of carvedilol in the presence of 20% hydroxypropyl-β -cyclodextrin at same pH values. It was observed that solubility of protonated form is more than neutral molecule. Hydroxypropyl-β -cyclodextrin resulted in increased solubility at all the pH. But inclusion in the cavity of hydroxypropyl-β -cyclodextrin might depend upon charge state of the molecule. So it can be concluded that solubility of carvedilol, can be increased either by the addition of hydroxypropyl-β -cyclodextrin or by adding pH lowering agents. But both these methods if are to be used together, pH should be selected carefully.
Carvedilol, hydroxypropyl-Î² -cyclodextrin, solubility, bioavailability, pH