If the hydrolysis of glucose chains were to occur by adding acid, the degree of polymerization (DP) for glucose chains should decrease. Intrinsic viscosity ([h]) was then measured to confirm that the hydrolysis of glucose chains did occur. Since [h] depends on DP, the size of glucose chains can be estimated from changes in [h]. Fig. 3 shows the results of intrinsic viscosity measurements. The pH of the x-axis is equivalent to the pH in the preparation for cornstarch pastes. The pH was adjusted by adding citric acid before gelatinization. [h] decreased slightly with acidification at pHR4.0. This decrease indicates that few glucose chains were hydrolyzed by adding acid. However, increases in the viscosity were observed, where the pH is between 5.5 and 3.6 as shown in Fig. 1. It is thought that acids enter the starch granules, causing the hydrolysis of glucose chains inside starch granules, which then makes many glucose chains leach out into the starch pastes. Therefore, the entanglements of glucose chains increase further than those of the control. [h] decreased sharply at pH!4.0. This indicates that hydrolysis of glucose chains occurred by adding acid and DP decreased further than that at pHR4.0. Decreases in the viscosity were observed, where the pH is below 3.5, since the entanglements of glucose chains were less than those at pHR4.0. Precipitation of starch in starch pastes occurred at pH!2.7 (Figs. 1 and 3). The precipitation of starch is thought to be caused by many glucose chains with low DP in starch pastes. Burchard (1963) and