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Stearin / ˈ s t ɪər ɪ n /, or tristearin, or glyceryl tristearate is an odourless, white powder. It is a triglyceride derived from three units of stearic acid . Most triglycerides are derived from at least two and more commonly three different fatty acids . [ 7 ]
The triglyceride derived from three molecules of stearic acid is called stearin. [9] Stearic acid is a prevalent fatty-acid in nature, found in many animal and vegetable fats, but is usually higher in animal fat than vegetable fat. It has a melting point of 69.4 °C (156.9 °F) °C and a pKa of 4.50. [11]
Palm stearin is the solid fraction of palm oil that is produced by partial crystallization at controlled temperature. [1] It is a stearin in the sense of stearins and oleins being the solid and liquid fractions respectively of fats and oils; not in the sense of glyceryl tristearate.
Skeletal formula of stearin, a triglyceride that is converted by saponification with sodium hydroxide into glycerol and sodium stearate. Fat in a corpse converts into adipocere, often called "grave wax". This process is more common where the amount of fatty tissue is high and the agents of decomposition are absent or only minutely present.
The lower legs of slaughtered cattle (less the hooves) are boiled, skin and all.The fat that is released (as an oil) is skimmed off, filtered, and pressed.The first pressing is the highest grade; the second produces both a lower grade and a solid press cake or stearin product used, among other things, to make soap.
Shea butter is composed of five principal fatty acids: palmitic, stearic, oleic, linoleic, and arachidic (see Table below). About 85 to 90% of the fatty acid composition is stearic and oleic acids.
Industrially-produced lard, including much of the lard sold in supermarkets, is rendered from a mixture of high and low quality fat from throughout the pig. [19] Lard is often hydrogenated to improve its stability at room temperature. Hydrogenated lard sold to consumers typically contains fewer than 0.5 g of transfats per 13 g serving. [20]
Sodium stearate is produced as a major component of soap upon saponification of oils and fats. The percentage of the sodium stearate depends on the ingredient fats. Tallow is especially high in stearic acid content (as the triglyceride), whereas most fats only contain a few percent. The idealized equation for the formation of sodium stearate ...