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Sorbitan monostearate (also known as Span 60) is an ester of sorbitan (a sorbitol derivative) and stearic acid and is sometimes referred to as a synthetic wax. It is primarily used as an emulsifier to keep water and oils mixed. Sorbitan monostearate is used in the manufacture of food and healthcare products, and is a non-ionic surfactant with emulsifying, dispersing, and wetting properties.
Sorbitan fatty acid esters are prepared by forming anhydro sorbitol (a mixture of sorbitans, isosorbide, and unreacted sorbitol) by acid-catalyzed anhydrization, then reacting the resulting anhydro sorbitol with a fatty acid in the presence of a base at a temperature not exceeding about 215° C. Use of temperatures not over 215° C. results in products having substantially less color than .
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The Food and Drug Administration (FDA) is amending the food additive regulations to provide for the safe use of sorbitol anhydride esters, an emulsifier blend of sorbitan monostearate, polyoxyethylene (20) sorbitan monostearate (polysorbate 60) and polyoxyethylene (20) sorbitan monolaurate (polysorbate 20) as an anticorrosive agent in boilers where steam may contact food.
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The invention discloses a preparation technique of sorbitan monooleate, which comprises the following steps: sequentially adding oleic acid, sorbitol and a composite catalyst into a vacuum reaction kettle, and starting a material circulating pump when the material temperature is greater than 165 DEG C; reacting for 8.5-9 hours, taking samples every other 15-30 minutes, observing the product .
Mixtures of sorbitol fatty acid esters useful as low calorie fat substitutes are prepared through a direct esterification process. The process entails the direct esterification of sorbitol with free fatty acids, optionally in the presence of an esterification catalyst. The resulting sorbitol esters have an average degree of hydroxyl substitution ranging from about 3 to about 5.5.