Carbamoylethylation of moghat mucilage

Abstract

Mucilage isolated from the grinded roots of Glossostemon bruguieri (Desf.) (moghat) was subjected to carbarnoylethylation, which involved the reaction of the moghat mucilage with acrylamide along with sodium hydroxide as a catalyst. The reaction was found to depend on the acrylarnide concentration as well as on temperature. While the extent of carbarnoylethylation increases by increasing acrylamide concentration from 20 to 100 g/lOO g mucilage, it decreases by raising the reaction ternperature from 25 "C to 75 "C. The carbamoylethylated moghat mucilage exhibits non-Newtonian pseudoplastic behaviour irrespective of the extent of carbamoylethylation. On the other hand, increasing the extent of carbarnoylethylation is accompanied by an enhancement in the apparent viscosity. This was evidenced by the direct relation of the apparent viscosity with the increase in acrylamide concentration and its inverse relation with the temperature. A 72 h storage of the pastes under investigation causes a considerable decrement in apparent viscosity only when the extent of carbamoylethylation is low. Higher extents of carbamoylethylation stabilised the molecular structure of the moghat mucilage.