Hard Fat
If you find any inaccurate information, please let us know by providing your feedback here
Tóm tắt nội dung
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
Hard Fat is a mixture of glycerides of saturated fatty acids.
2 IMPURITIES
Residue on Ignition 〈281〉: NMT 0.05%
Alkaline Impurities
Sample: 2.0 g
Analysis: Dissolve the Sample in a mixture of 1.5 mL of alcohol and 3.0 mL of ether. Add 0.05 mL of bromophenol blue TS, and titrate with 0.01 N hydrochloric acid to a yellow endpoint.
Acceptance criteria: NMT 0.15 mL of 0.01 N hydrochloric acid
3 SPECIFIC TESTS
Melting Range or Temperature, Class II〈741〉: The melting temperature does not differ by more than 2° from the nominal value given in Labeling.
Fats and Fixed Oils, Acid Value〈401〉: NMT 1.0
Fats and Fixed Oils, Hydroxyl Value〈401〉: NMT 70
Fats and Fixed Oils, Iodine Value〈401〉: NMT 7.0
Fats and Fixed Oils, Saponification Value〈401〉: 215–255
Fats and Fixed Oils, Unsaponifiable Matter〈401〉: NMT 3.0%
4 ADDITIONAL REQUIREMENTS
Packaging and Storage: Preserve in tight containers at a temperature that is 5° or more below the melting range stated in the labeling.
Labeling: The labeling includes the nominal melting temperature, which is 27°–44°.
