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USP

Stearic acid

United States Pharmacopeia (USP) Reference Standard

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Synonym(s):
1-Heptadecanecarboxylic acid, C18:0, Cetylacetic acid, NSC 25956, NSC 261168, Octadecanoic acid, Stearophanic acid
Linear Formula:
CH3(CH2)16COOH
CAS Number:
57-11-4
Molecular Weight:
284.48
Beilstein:
608585
MDL number:
MFCD00002752
UNSPSC Code:
41116107
PubChem Substance ID:
329751146
NACRES:
NA.24

grade

pharmaceutical primary standard

vapor pressure

1 mmHg ( 173.7 °C)

API family

stearic acid

manufacturer/tradename

USP

bp

361 °C (lit.)

mp

67-72 °C (lit.)

solubility

acetone: soluble
benzene: freely soluble
chloroform: freely soluble
ethanol: soluble
ether: freely soluble
propylene glycol: soluble
water: practically insoluble

density

0.845 g/cm3

application(s)

pharmaceutical (small molecule)

format

neat

SMILES string

CCCCCCCCCCCCCCCCCC(O)=O

InChI

1S/C18H36O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20/h2-17H2,1H3,(H,19,20)

InChI key

QIQXTHQIDYTFRH-UHFFFAOYSA-N

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General description

This product is provided as delivered and specified by the issuing Pharmacopoeia. All information provided in support of this product, including SDS and any product information leaflets have been developed and issued under the Authority of the issuing Pharmacopoeia. For further information and support please go to the website of the issuing Pharmacopoeia.

Application

Stearic acid USP reference standard for use in specified quality tests and assays.

Also used to prepare standard solution for assay and impurity analysis according to the given below monographs of United States Pharmacopeia (USP):
  • Stearic acid
  • Palmitic Acid
  • Sodium Stearate
  • Aluminum Monostearate

Analysis Note

These products are for test and assay use only. They are not meant for administration to humans or animals and cannot be used to diagnose, treat, or cure diseases of any kind.  ​

Other Notes

Sales restrictions may apply.

WGK

nwg

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Sodium Stearate
United States Pharmacopeia, 39(3), 6024-6024 (2023)
Aluminum Monostearate
United States Pharmacopeia, 44(4), 5612-5612 (2019)
Stearic acid
United States Pharmacopeia, 34(5), 3146-3146 (2020)
Palmitic Acid
United States Pharmacopeia, 42(3), 5918-5918 (2019)
S M Grundy
The American journal of clinical nutrition, 60(6 Suppl), 986S-990S (1994-12-01)
Stearic acid is a long-chain saturated fatty acid. However, in contrast with other saturated fatty acids, stearic acid apparently does not raise serum cholesterol concentrations. Studies carried out three decades ago provided strong suggestive evidence that this was the case.
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