Iodine solution or Lugol's reagent has yellowish brown color. Iodine interacts with and binds to a structure in thestarchmolecule, forming a structure that transmits a dark bluish black color.

Figure 1.(-) is negative result;(+) is positive result.

Monosaccharides一个nd otherpolysaccharidescause no color changes.

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• 食物biohemistry测试