Food Tests

Question 0

What is used to indicate glucose and what will a positive and negative result show?

Answer 0

Benedict’s solution Positive result - bright orange/rust Negative result- no colour change

Question 1

What is used to indicate protein and what will a positive and negative result show?

Answer 1

NaOH and CuSO4 (Biuret test) Positive result- blue/purple Negative result-not blue or purple

Question 2

What is used to indicate starch and what will a positive and negative result show?

Answer 2

Iodine solution Positive result- purple Negative result - piss yello

Question 3

What is used to indicate lipid and what will a positive and negative result show?

Answer 3

Brown paper Positive result- paper turns transparent Negative result- no transparency

Question 4

What is used to indicate sodium chloride ions and what will a positive and negative result show?

Answer 4

AgNO3 (silver nitrate) Positive result- sperm precipitate Negative result - no precipitate

Question 5

What is used to indicate Lignin and what will a positive and negative result show?

Answer 5

Toluidine blue Positive result - blue/green Negative - pale blue/no colour change