Carnauba Wax
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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)
1 DEFINITION
Carnauba Wax is obtained from the leaves of Copernicia cerifera Mart. (Fam. Palmae).
2 IDENTIFICATION
A. SPECTROSCOPIC IDENTIFICATION TESTS (197), Infrared Spectroscopy: 197F ог 197A
3 IMPURITIES
RESIDUE ON IGNITION (281)
Sample: 2 g
Analysis: Heat the Sample in an open porcelain or platinum dish over a flame; it volatilizes without emitting an acrid odor. Ignite.
Acceptance criteria: The weight of the residue is NMT 5 mg, corresponding to NMT 0.25%,
4 SPECIFIC TESTS
MELTING RANGE OR TEMPERATURE (741), Procedures, Procedure for Class II: 80°-86°
4.1 ACID VALUE
Sample: 3 g
Analysis: Weigh the Sample into a 250-mL ask attached to a reux condenser. Add 50 mL of a mixture of isopropyl alcohol and toluene (5:4), and boil gently until the wax is completely dissolved. Remove the ask from the condenser, add 1 mL of phenolphthalein TS, and immediately titrate with 0.5 N alcoholic potassium hydroxide VS to a faint, reddish-yellow color. [Note—Do not allow the solution to cool. Titrate at warm temperature after reuxing.]
Calculate the acid value as the number of milligrams of potassium hydroxide required to neutralize the free acids in 1 g of Carnauba Wax
Acceptance criteria: 2-7
Change to read:
4.2 FATS AND FIXED OILS (401), Saponification Value
Sample: Use the solution from the test for Acid Value.
Analysis: To the Sample add 15.0 mL of 0.5 N alcoholic potassium hydroxide VS, reflux for 3 h, and titrate the excess alkali with 0.5 N hydrochloric acid VS to a yellow-amber color. Perform a blank determination (see Titrimetry (541), Types of Titrations, Blank Corrections, (CN 1-Aug-2024)).
Calculate the ester value. The saponification value is the sum of the ester value and the acid value.
Acceptance criteria: 78-95
5 ADDITIONAL REQUIREMENTS
PACKAGING AND STORAGE: Preserve in well-closed containers.
USP REFERENCE STANDARDS (11)
USP Camauba Wax RS
