El azúcar invertido es la disgregación por hidrolización de la sacarosa en glucosa y fructosa. Su nombre hace referencia a que el poder rotatorio de la solución frente a la luz polarizada es invertido por el proceso de hidrólisis que separará la sacarosa en sus dos subunidades.

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Inverted or invert sugar syrup is a mixture of glucose and fructose; it is obtained by splitting the disaccharide sucrose into these two components. Compared with its precursor, sucrose, inverted sugar is sweeter-tasting and its products tend to retain moisture and are less prone to crystallization. Inverted sugar is therefore valued by bakers, who refer to the syrup as invert syrup. Sucrose is a disaccharide, a molecule derived from two simple sugars (monosaccharides). In sucrose, the monosaccharide building blocks are fructose and glucose. The splitting of sucrose is a hydrolysis reaction. The hydrolysis can be induced simply by heating an aqueous solution of sucrose, but more commonly, catalysts are added to accelerate the conversion. The biological catalysts that are added are called sucrases (in animals) and invertases (in plants). Sucrases and invertases are types of glycoside hydrolase enzymes. Acid, such as lemon juice or cream of tartar, can also accelerate the conversion of sucrose to invert sugar.

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