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stearin(stēr`ĭn), fat that is the triglyceridetriglyceride,
ester formed from glycerol and one to three fatty acids. Fats and oils are triglycerides. In a simple triglyceride such as palmitin or stearin, all three fatty-acid groups are identical.
..... Click the link for more information. of stearic acid, CH3(CH2)16CO2H, i.e., the tristearate ester of glycerol. It is a white crystalline solid at ordinary temperatures and is insoluble in water and very slightly soluble in alcohol. It is found (often mixed with palmitinpalmitin
, fat that is the triglyceride of palmitic acid, CH3(CH2)14CO2H, i.e., the tripalmitate ester of glycerol. It is a white crystalline solid at ordinary temperatures, insoluble in water but soluble in ethanol and ether.
..... Click the link for more information. ) in many hard fats and oils, e.g., in tallow, suet, butterfat, cottonseed oil, and olive oil. It is used in making soap and candles.
technical-grade stearic acid; a mixture of the higher fatty carboxylic acids, mainly stearic and palmitic acids. Stearin is a semitransparent white or yellowish substance that is greasy to the touch. Depending on the source, it has a melting point between 53° and 65°C; its density is 0.92 g/cm3 (20°C). It is obtained by the distillation of hydrolysates of animal fats with subsequent crystallization and pressing or by the hydrogenation of unsatu- rated acids from vegetable oils. Stearin is used in the production of candles, usually in a mixture with paraffin.