In vitro investigation on interaction of ranitidine hydrochloride in the presence of cross-linked carboxymethyl cellulose sodium

The adsorbance of ranitidine hydrochloride - drug selective H-2 histamine receptor inhibitor used in the treatment of gastric and duodenal ulcer was investigated in the presence of croscarmellose, a Cross- linked polymer of polysaccharide character used as a swelling additive in oral pharmaceutical formulations - capsules, tablets and granules. The evaluation of adsorbance capability was carried out by means of a statistical method in in vitro conditions, taking into account environmental pH, concentration of the investigated drug as well as the properties of the polymer. Obtained results prove that the analyzed active agent is adsorbed on polymer at all the investigated pH ranges and the capability of polymer binding depends on environmental pH. The highest binding capability was revealed in samples with pH Of 7.6, (adsorbance capacity k = 0.6958) while the lowest binding capability was observed at pH 1.5 (adsorbance capacity k = 0.0005) in the presence of croscarmellose sodium. Level of adsorption depends on the analyzed drug concentration and adsorption on polymer in increasing concentration and pH environment.