When sour seasonings (acids) were added before gelatinization, the viscosity of cornstarch pastes increased by adjusting the pH between 5.5 and 3.6, while the viscosity of pastes with pH below 3.5 decreased further than that of the control (pH 6.3) in the steady shear and dynamic oscillatory measurements. The viscosity of starch pastes depended on the pH since similar tendencies were observed by adding various acids.
It is obvious from intrinsic viscosity measurements that the hydrolysis of glucose chains occurs by adding acid before gelatinization. However, increases in the viscosity could be seen by adding small amounts of acids (3.5!pH! 5.5), because many glucose chains leached out from starch granules, inducing entanglements of glucose chains. On the other hand, adding large amounts of acids (pH%3.5) leads to the collapse of starch granules and thus, decrease in the viscosity was observed.
No decrease in the viscoelasticity was noted for cornstarch pastes by adding acids after gelatinization. The hydrolysis of glucose chains could be prevented.
When sour seasonings (acids) were added before gelatinization, the viscosity of cornstarch pastes increased by adjusting the pH between 5.5 and 3.6, while the viscosity of pastes with pH below 3.5 decreased further than that of the control (pH 6.3) in the steady shear and dynamic oscillatory measurements. The viscosity of starch pastes depended on the pH since similar tendencies were observed by adding various acids.It is obvious from intrinsic viscosity measurements that the hydrolysis of glucose chains occurs by adding acid before gelatinization. However, increases in the viscosity could be seen by adding small amounts of acids (3.5!pH! 5.5), because many glucose chains leached out from starch granules, inducing entanglements of glucose chains. On the other hand, adding large amounts of acids (pH%3.5) leads to the collapse of starch granules and thus, decrease in the viscosity was observed.No decrease in the viscoelasticity was noted for cornstarch pastes by adding acids after gelatinization. The hydrolysis of glucose chains could be prevented.
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