| 释义 |
sorbitan Chem.|ˈsɔːbɪtæn|
[f. sorbitol + anhydride.]
Any of a number of cyclic ethers which are monoanhydrides of sorbitol; spec. the 1,4-anhydride, CH2OH·CHOH·CH·(CHOH)2·CH2O, a colourless crystalline solid. Freq. attrib. in names of fatty-acid esters of these compounds, which are used as emulsifiers and surfactants.
1938Industr. & Engin. Chem. Nov. 1222/2 The inner ether hypothesis was further tested by substituting a mixture of preformed sorbitol inner ethers, or sorbitans, for the sorbitol. 1950Kirk & Othmer Encycl. Chem. Technol. V. 688 Anhydrides of certain hexahydric alcohols and their derivatives, as sorbitan and polyoxyethylene sorbitan esters of fatty acids, are used as emulsifiers and also possess emollient properties. 1958Martindale's Extra Pharmacopœia (ed. 24) 696 The ether-esters, such as sorbitan oleate, are active water-in-oil emulsifying agents, while the polyoxyethylene derivatives mostly produce oil-in-water emulsions. 1969tr. Schönfeldt's Surface Active Ethylene Oxide Adducts iv. 607 A composition containing glycine, phosphoric acid, and, e.g...ethoxylated sorbitan monolaurate as adduct, or sorbitan mono-oleate, is recommended as an antioxidant for fats. 1976Nature 26 Aug. 777/2 By use of surfactants such as sorbitan stearates, water can be emulsified in hydrocarbon solvents and then readily supercooled. |