Food Tests

Question 1

Test for starch

Answer 1

Procedure

1. Crush the food sample provided
2. Obtain the crushed food sample and put it in a test tube and add water to make a solution
3. Add a few drops of iodine solution and observe color change

Positive result&raquo_space; from brown to blue black

Question 2

Test for reducing sugars /glucose

Answer 2

1. Crush the food sample
2. Obtain thr crushed food sample, put in a test tube and add water to make a solution
3. Place the test tube in a hot water bath for heating
4. Add a few drops of Benedict solution and observe color changes

Positive results
From blue to to ROYBIV

Question 3

Test for proteins/buriet test

Answer 3

1
2
3. Hot water bath
4. Add copper 2 sulphate then sodium hydroxide, swirl to mix

Colour changes from blue to purple

Question 4

Test for fats

Answer 4

1.
2.
3. Add ethanol to make a solution
4. Add water and observe color change

Positive result&raquo_space; white emulsions