题目内容
Trans fats do not occur naturally in food products.
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Trans fats are an impurity of the hydrogenation process. The momentary addition of one hydrogen atom to the double bond followed by a rotation of the chain about the temporary single bond linkage in the fat molecule and loss of this hydrogen atom back to the catalyst permits the reformation of a double bond in the trans arrangement.
During the process of hydrogenation, hydrogen is added to the unsaturated fat to convert some of the "double bonds" into "single bonds" of saturated fat.
Carbon chains can rotate around a double bond (carbon=carbon or C=C).
Margarines can be made by the hydrogenation of liquid, unsaturated fats creating a product with a spreadable consistency.
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