Rheology of Sesame Pastes with Different Amounts of Water Added

الملخص EN

Sesame paste, usually served as a dressing in some local dishes and the desserts in Southeast Asia and the Middle East, requires mixing with water before consumption to form a thin emulsion of the oil-in-water type.

Usually water addition is performed empirically and it is difficult to keep the quality of water-mixed sesame paste consistent.

In this study, the rheological behavior of sesame paste with different ratios of sesame paste to added water was investigated.

The sesame paste tested contains 59.71% of crude fat and 17% of protein.

The ratios of sesame paste to added water (w/v) were 1 : 0.75 (T1), 1 : 1 (T2), 1 : 1.25 (T3), and 1 : 1.5 (T4), respectively.

All the samples showed the properties of the viscoelastic solids.

The samples T1 and T2 behaved as a pseudoplastic material, whereas the apparent viscosity of T3 and T4 remained almost unchanged with the shear rate increasing.

T2 had the moderate area of thixotropy loop (57.32 Pa/s) among the tested samples and scored the highest in the sensory evaluation.

Therefore, our study suggested that ratio of sesame paste to added water of 1 : 1 (w/v) is suitable for preparing dressings for different dishes.