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Studies on the Dry Preparation, Properties and Application of Carboxymethyl Starch

Author: ZhangHui
Tutor: DongHaiZhou
School: Shandong Agricultural University
Course: Agricultural Products Processing and Storage
Keywords: carboxymethyl starch dry preparation property application
CLC: TS239.6
Type: Master's thesis
Year: 2005
Downloads: 645
Quote: 3
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Abstract


With cornstarch as material, carboxymethyl starch was prepared by drypreparation method. Then the granules properties and paste properties ofcarboxymethyl starch were studied. Fertherly, the application of carboxymethylstarch to paper-making was studied. The main results were as follows:1. The dry preparation conditions of carboxymethyl starch. At first,the factors which affect dry preparation of carboxymethyl starch were studiedby single factor experiment, such as: the mole ratio of CH2ClCOOH/starch, themole ratio of NaOH/CH2ClCOOH, moisture content, reaction temperature andreaction time.Then by using quadratic general rotary design, we got the optimumtechnique parameters: NaOH/CH2ClCOOH mole ratio is 3.2, 20% moisturecontent, reaction temperature is 66℃, reaction time is 3.6h.2. Properties of carboxymethyl starch. Properties of granules and pasteof native starch and carboxymethyl starch were compared, the conclusionswere as follows:Carboxymethylation occurred not only in the amorphous regions but alsoin the crystalline regions. At the same time starch granules swelled, caves andcracks appeared on the surface of granules. With DS increased, granules werefurther destroyed.Carboxymethylation decreased pasting temperature of native starch, thecarboxymethyl starch with high DS could gelatinise at room temperature.Compared with native starch, the paste viscosity of carboxymethyl starchdecreased and the paste cold viscosity stability increased. Carboxymethylstarch paste had better stability against acid and alkali, high temperature andshearing, and had better freeze-thaw stability, higher clarity. Aftercarboxymethylation the hardness and adhesiveness of starch gel decreased.The rheological properties of carboxymethyl starch paste and the effect ofconcentration and DS on them have been studied. The results showed that:

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