Testing for biological molecules

Need to know

What you need to know

• 2.1 Testing for biomolecules Food tests 1) Reducing sugars.
• reduce soluble blue copper sulphate containing copper (II) ions to insoluble brick-red copper oxide, containing copper (I).
• the copper oxide is seen as a brick-red ppt.
• add equal volumes of Benedict’s reagent and the food sample to a test tube.
• heat in a water bath at 80°C.
• if reducing sugars are present, the following colour changes are observed: 2) Non-reducing sugars.

Explanation

Testing for biological molecules

1. 2.1 Testing for biomolecules Food tests 1) Reducing sugars.
2. reduce soluble blue copper sulphate containing copper (II) ions to insoluble brick-red copper oxide, containing copper (I).
3. the copper oxide is seen as a brick-red ppt.
4. add equal volumes of Benedict’s reagent and the food sample to a test tube.