- Stearic acid
(IUPAC systematic name: octadecanoic acid) is a saturated fatty
acid that occurs in many animal and vegetable fats and oils.
- Stearic acid
is a waxy solid, and its chemical formula is C18H36O2 .
- The salts
and esters of stearic acid are called stearates.
- It is
practically insoluble in water], fairly soluble in chloroform and
decreasingly soluble in CS2, C6H6,CCl4,CH3CH2OH and CH3 – O – CH3.
acid occurs in most fruit flesh and seed fats and in marine
acid is prepared by treating animal fat with water at a high
pressure and temperature, leading to the hydrolysis of
- It can
also be obtained from the hydrogenation of some unsaturated
stearic acid is actually a mix of stearic acid and palmitic
acid, although purified stearic acid is available separately.
acid is used as plasticizer, softener, water – proofing agent,
polishing agent, oiling agent and antisatatic agent .
Potassium salts of fatty acids with excess stearic acid give a
slow drying lather for shaving soap.
Derivations of stearic acid are used in manufacture of
Soaps,Metallic salts, Stearoyl chlorides, Bromide, Steramide,
Stearonitrile, Stearyl alcohol.
fireworks, stearic acid is often used to coat metal powders
such as aluminium and iron.
acid is used along with simple sugar or corn syrup as a
hardener in candies.
Stearic acid undergoes the typical reactions of saturated
carboxylic acids, notably reduction to stearyl alcohol, and
esterification with a range of alcohols.
Stearic acid’s neutral effect on blood total and LDL
cholesterol levels implies that this long-chain SFA may not
increase the risk for cardiovascular disease.
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