| Abstract: | CONCLUSION. An improved procedure for the production of CMS has been developed, giving degrees of substitution up to 1.5 connected with yields higher than 70% in one step. This investigation is seen as a basis for an industrially applicable methodology. An advantage of the developed sequence of adding the reagents is the possibility to control the water content in the reaction mixture in orderto prevent agglomeration of the formed starch derivative. Furthermore, considering the costs this method allows to use free monochloroacetic acid as etherification agent instead of the more expensive sodium salt. The products on the basis of an amylose-free starch, e.g. waxy corn starch, are good viscosity regulators and they are completely soluble in cold water to form clear solutions. With the increase in the number of carboxyl groups the calcium-binding capacity increases, too. At a degree of substitution of about 2 the binding capacity is as high as that of di-/tricarboxyl starch. The biodegradability of highly substituted products (DS > 1) lies in the range of 5 to 20%. |
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