Construct · 3 fields · 4 citations
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Saponification is the base-catalysed hydrolysis of a fat or oil: a triglyceride reacts with a strong alkali such as sodium or potassium hydroxide to yield glycerol and the alkali salts of its fatty acids, the carboxylate salts we call soap. Dunn's Scientific soapmaking sets out the stoichiometry, the per-oil alkali requirement, and the kinetics that govern a cold-process batch. The referent is the conversion of esterified fat into fatty-acid soap, the same reaction that recurs when oil paint degrades and when chemists assay a fat's saponifiable content.[1]
In fats-and-oils analysis the same reaction is run deliberately to characterise a material: the saponification value is the milligrams of potassium hydroxide needed to saponify one gram of fat, which rises as the average fatty-acid chain length falls, giving a quick index of molecular weight and composition. Christie and Han's Lipid analysis describes the method and its place among the classic oil indices. Here saponification is not an end product but a measuring stick, the identical chemical reaction harnessed to quantify a fat.[2]
Conservation scientists find the same reaction at work inside ageing oil paintings: free fatty acids released from the drying-oil binder react with metal ions from pigments such as lead white or zinc white to form metal soaps, which aggregate, migrate, and erupt as protrusions or hazes that disfigure the paint. Casadio, Keune, and colleagues' Metal soaps in art and Hermans and colleagues' spectroscopic work document how these carboxylate salts form and behave. It is saponification again (fatty acids converted to carboxylate soaps), here an unwanted degradation rather than a product or an assay.[3][4]
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