How do you test for presence of reducing sugar in fruit juice?

To test for reducing sugars in fruit juice, you can use Benedict's test. First, mix equal volumes of the juice and Benedict's reagent in a test tube, then heat the mixture in a boiling water bath for about 5-10 minutes. If reducing sugars are present, the solution will change color, typically from blue to green, yellow, or brick-red, indicating the presence and concentration of reducing sugars.