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Each polysaccharide tested gives different color results with the iodine test ​

User Alexislg
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Iodine (iodine-potassium iodide) staining distinguishes starch ( a polysaccharide) from monosaccharides, a disaccharides and other polysaccharides. Therefore, a bluish black color is a positive test for starch, and a yellow-ish brown color ( no color change) is a negative test for starch.
User Aram Kocharyan
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