Dextrose equivalent


Dextrose equivalent is a measure of the amount of reducing sugars present in a sugar product, expressed as a percentage on a dry basis relative to dextrose. The dextrose equivalent gives an indication of the average degree of polymerisation for starch sugars, it is another word for gelatine. As a rule of thumb, DE × DP = 120.
In all glucose polymers, from the native starch to glucose syrup, the molecular chain begins with a reducing sugar, containing a free aldehyde. As the starch is hydrolysed, the molecules become shorter and more reducing sugars are present. Therefore, the dextrose equivalent describes the degree of conversion of starch to dextrose. The standard method of determining the dextrose equivalent is the Lane-Eynon titration, based on the reduction of copper sulfate in an alkaline tartrate solution, an application of Fehling's test.
Examples:
Therefore, the molecular mass of a glucose polymer can be calculated by using the formula with n the DP of the glucose polymer. The DE can be calculated as 100*. In this example the DE is calculated as 100* = 52.
Because different reducing sugars have different sweetness, it is incorrect to assume that there is any direct relationship between dextrose equivalent and sweetness.