Presentation is loading. Please wait.

Presentation is loading. Please wait.

Testing for Macromolecules. Why test for macromolecules?  It is important in the study of human health and diet as well as for the food processing industry.

Similar presentations


Presentation on theme: "Testing for Macromolecules. Why test for macromolecules?  It is important in the study of human health and diet as well as for the food processing industry."— Presentation transcript:

1 Testing for Macromolecules

2 Why test for macromolecules?  It is important in the study of human health and diet as well as for the food processing industry.  Foods are tested for the amount and type of carbohydrates, protein and lipids they contain so that that information can be placed on food labels.  The food industry would test newly developed food products to see if they meet the standards they want their food to be at.

3 Testing for complex carbohydrates (starch)  Testing for Complex Carbohydrates (starch)  Lugol's reagent ( iodine solution)is a yellowish brown colour and will change to dark purple/black in presence of starch

4 Testing for simple carbohydrates  Benedict’s solution is the colour blue and will change into an orange/red colour when heated in a water bath if simple carbohydrates (e.g. glucose) are present in the food source.

5 Testing for lipids  Sudan IV is fat soluble and it is the colour red and will stain lipids a redish orange colour if they are present in the food source.  OR grease spot test/Brown paper test, lipids leave translucent (grease spots) on unglazed brown paper bags

6 Testing for Proteins  Biuret solution is the colour blue and will change into a purple colour if proteins are present in the food source.

7 Identifying nutrients gizmo   Class code: UJVMRDR7NZ  Homework: Determine what foods are in the test tubes on worksheet


Download ppt "Testing for Macromolecules. Why test for macromolecules?  It is important in the study of human health and diet as well as for the food processing industry."

Similar presentations


Ads by Google