Studies on interaction between starches and surfactants. Part 3. Effects of sodium dodecyl sulfate on the viscosity of dilute waxy corn starch paste.

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  • 澱粉と界面活性剤との相互作用に関する研究　ＩＩＩ　モチトウモロコシ澱粉希薄糊の粘度に及ぼすドデシル硫酸ナトリウムの影響

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The effect of sodium dodecyl sulfate (SDS) on the viscosity of a dilute waxy corn starch paste was measured with a B (Brookfield) type viscometer. The addition of SDS to the paste increased the viscosity. The increase in the viscosity of the paste was inhibited by an increase in the ionic strength and was influenced by heating temperatures or times . Although the binding isotherm of SDS to gelatinized starch had almost the same degree as that to dispersed starch, an increase in the viscosity might be essentially caused by the interaction between swollen starch granules and SDS. Pretreatment of the paste with j3-amylase resulted in the disappearance of the increase in the viscosity. We concluded that an interaction between amylopectin and SDS leads to a further expansion of the swollen granules due to an electrostatic repulsion between adjacent branches of amylopectin molecules, holding sulfate ions, which may be attributed to the increase in the viscosity of the paste.

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