Sodium starch glycolate is the sodium salt of carboxymethyl ether. It is white to off-white, odorless, tasteless, and free-flowing powder. It is produced by cross-linking and carboxy methylation of potato starch. It can also be manufactured from other starch foods such as corn, wheat, and rice. Sodium starch glycolate is practically insoluble in water and insoluble in most organic solvents. It exists in the form of oval, rounded, irregularly shaped, or spherical granules. These granules exhibit considerable swelling upon contact with water. Based on the empirical formula and molecular weight, sodium starch glycolate can be classified into two types: type A and type B. Based on pH value, it is classified into three types that include type C.
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