Adsorption of naringin on nonionic (neutral) macroporus adsorbent resin from its aqueous solutions

Naringin, a flavonoid, is major bittering principal in citrus juices. Adsorption studies were carried out with aqueous solutions of naringin on polymeric non-ionic (neutral) macroporus adsorbent resin (which are exploited for debittering of citrus juices) to know adsorption behavior of above bittering principal. It was found that at solution concentration 1.25 kg/m3, 0.15 kg naringin can be picked up by 1 kg dry resin. Most of the adsorption takes place during the first 90 min. The naringin picked up by the adsorbent at equilibrium is not affected appreciably by the presence of citric acid. Adsorption of naringin is somewhat slower in the presence of citric acid i.e. it would take somewhat more time for saturation of adsorbent with naringin in the presence of citric acid. The data could be correlated satisfactorily with adsorption shell model with adjusted concentration which takes into account the sharp drop into concentration of solution during early period. From the initial condition i.e. initial concentration and volume of solution and amount of adsorbent the concentration history with time could be predicted.