Food Tests - Practical Skills Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

Describe how you would prepare a sample of food to be tested

A
  • Grind up food samples using pestle and mortar
  • Mix with water
  • Filter with funnel and filter paper
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Describe how you would test for the presence of starch in a sample

A
  • Add iodine solution to the sample
  • If starch is present, solution turns from brown to blue-black
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Describe how you would test for the presence of a reducing sugar in a sample (Glucose)

A
  • Add Benedict’s reagent to sample
  • Boil test tube in a hot water bath
  • If reducing sugar is. present, a brick red precipitate forms. If not, the solution remains blue
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Describe how you would test for the presence of protein in a sample

A
  • Add Biuret reagent (potassium hydroxide and copper (II) sulphate)
  • Shake mixture
  • If protein is present, solution turns from blue to purple
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Describe how you would test for the presence of lipids in a sample

A
  • Add ethanol to the sample
  • Add water to sample
  • Shake test tube
  • White emulsion formed if lipid is present
How well did you know this?
1
Not at all
2
3
4
5
Perfectly