Dextrin,

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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(C₆H₁₀O₅)₂ · xH₂O       CAS RN^®: 9004-53-9.-A white amorphous powder. Slowly soluble in cold water, more readily soluble in hot water; insoluble in alcohol.

INSOLUBLE MATTER: Boil 1 g with 30 mL of water in a small flask: the solution is colorless and clear, or not more than opalescent.

LOSS ON DRYING (731): Dry it at 105° to constant weight: it loses not more than 10.0% of its weight.

RESIDUE ON IGNITION (Reagent test): Ignite 1 g with 0.5 mL of sulfuric acid; the residue weighs not more than 5 mg (0.5%).

CHLORIDE (Reagent test): Dissolve 3 g in 75 mL of boiling water, cool, dilute with water to 75 mL, and filter if necessary. To 25 mL of the filtrate add 2 mL of nitric acid and 1 mL of silver nitrate TS, and allow to stand for 5 minutes: any turbidity produced is not greater than that of a control containing 0.02 mg of added CI (0.002%).

SULFATE (Reagent test, Method I): To a 25-ml. portion of the filtrate from the preceding test add 0.5 mL of diluted hydrochloric acid and 2 mL of barium chloride TS, and allow to stand for 10 minutes: any turbidity produced is not greater than that of a control containing 0.2 mg of added SO, (0.02%).

ALCOHOL-SOLUBLE SUBSTANCES: Boil 1 g with 20 mL of alcohol for 5 minutes under a reflux condenser, and filter while hot. Evaporate 10 mL of the filtrate on a steam bath, and dry at 105°: the residue weighs not more than 5 mg (1%).

REDUCING SUGARS: Shake 2 g with 100 mL of water for 10 minutes, and filter until clear. To 50 mL of the filtrate add 50 mL of alkaline cupric tartrate TS, and boil for 3 minutes. Filter through a tared filtering crucible, wash with water, then with alcohol, and finally with ether, and dry at 105° for 2 hours: the precipitate of cuprous oxide weighs not more than 115 mg (corresponding to about 5% of reducing sugars as dextrose).