Starch, Iodide-Free, TS
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This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
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—Mix 1 g of soluble starch with sufficient cold water to make a thin paste. While stirring, add 100 mL of boiling water, and allow to cool.
Prepare this solution immediately before use. Iodide-free starch TS shows a blue color when 20 mL of potassium iodide solution (1 in 400) and 0.05 mL of an iodine–potassium iodide solution (prepared by dissolving 127 mg of iodine and 800 mg of potassium iodide in water and diluting with water to 100 mL) are added to 1 mL of the iodide-free starch TS.
