Pectin is an important polysaccharide with applications in food industry, cosmetics and pharmacy. In recent years, there has been an increased use of hydrogels in pharmaceutical formulations in connection with drug-delivery administration. In this study of aqueous pectin systems, association and gelation have been accomplished by changing pH of the samples to an acidic pH. This is carried out by adding glucono-delta-lactone (GDL), which will gradually reduce the pH of the system. As the pH is reduced, the carboxyl acid groups on the pectin chains are neutralized, and the polyelectrolyte character of the polymer is reduced promoting association and gelation of the system. The viscoelastic properties of the system are monitored by oscillatory shear measurements as a function of time after the addition of GDL. The system exhibits very long gelation times and a pronounced viscosity increase in the vicinity of the gel points.