How do you test for glucose in food?

Answer 1

In order to see if biscuits have glucose in them, take a pea size sample of your food.

put it in a test tube, and add 2 ml of water. add five drops of Benedicts solution.

heat over a Bunsen burner, DO NOT BOIL.

watch the colour change from blue to green to yellow to orange. this will show that it has glucose in it.

a negative test will stay slightly blue.

(you may need to ask your science teacher at school for the chemicals)

:) hope that answers your question

not sure of an easier way.

Answer 2

How to test for glucose:

1. If the food you want to test is solid, grind it and add it to a test tube

2. Add Benedict's solution to the test tube

3. Heat this by placing the test tube in boiling water

4. The solution will turn clear blue, then cloudy green, then yellow and finally a red precipate of copper (1) oxide will be produced, showing that glucose is present

Answer 3

A Benedict's test should be done to determine whether a sample contains glucose.

Added:

This also goes for other reducing sugars like galactose, maltose, honey sugar and even fructose. So, it is not a specific test on only glucose.

Cited from Wikipedia:

Benedict's is a test for the presence of reducing sugars. This includes all monosaccharides and the disaccharides, lactose and maltose. Even more generally, Benedict's test will detect the presence of aldehydes (except aromatic ones), and alpha-hydroxy-ketones, including those that occur in certain ketoses. Thus, although the ketose fructose is not strictly a reducing sugar, it is an alpha-hydroxy-ketone, and gives a positive test because it is converted to the aldoses glucose and mannose by the base in the reagent.