Food Tests (gcse Biology)

This is an article recapping the Food tests for different biomolecules at the GCSE level.

Reducing sugars:

Add Benedicts Reagent and boil the solution. If a reducing sugar is present, the colour changes froms. blue solution to a red precipitate.

Proteins:

Add Biuret solution. If proteins are present, solution changes from blue to purple.

Starch:

Add iodine. If starch is present, the solution turns from Yellow/brown to Blue/black

Lipids:

Add ethanol. If lipids are present, the colourless solution forms a white emulsion.

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