The test that is commonly used to determine the presence of fructose is the Benedict’s test. Benedict’s test is a chemical test used to detect the presence of reducing sugars, including fructose. The test involves adding Benedict’s reagent (a solution of copper sulfate, sodium carbonate, and sodium citrate) to the sample solution and then heating it. If fructose is present, it will reduce the copper ions in the Benedict’s reagent, causing a color change from blue to green, yellow, orange, or red, depending on the concentration of fructose.
It’s worth noting that the Benedict’s test is not specific to fructose and can also detect other reducing sugars such as glucose and maltose. If you specifically want to test for fructose, additional tests like the Seliwanoff’s test or chromatographic techniques may be used