ATP

Question 1

What are the 4 food tests?

Answer 1

Iodine for starch
Benedict for reducing sugars
Biuret for Protein
Ethanol for Lipids

Question 2

What is the negative color for Iodine test for starch

Answer 2

Yellow/Brown

Question 3

What is the positive color for Iodine test for starch

Answer 3

Black

Question 4

What is the negative color for Benedict test for sugar/glucose

Answer 4

light blue

Question 5

What is the positive color for Benedict test for sugar/glucose

Answer 5

Range of colors
green- trace
yellow- low
orange- moderate
brick red- high

Question 6

What is the negative color for Ethanol test for Lipids

Answer 6

colorless

Question 7

What is the positive color for Ethanol test for Lipids

Answer 7

cloudy emulsion

Question 8

What is the negative color for Biuret test for Protein

Answer 8

blue

Question 9

What is the positive color for Biuret test for Protein

Answer 9

Purple

Question 10

What does Iodine test for?

Answer 10

Starch

Question 11

What does Biuret test for?

Answer 11

Protein

Question 12

What does Emulsion (ethanol) test for?

Answer 12

Lipids (fats)

Question 13

What does Benedict test for?

Answer 13

Reducing Sugar/ Glucose (concentration)

Question 14

Method for Iodine test for starch

Answer 14

1. Place food samples on spotting tile
2. Number each sample
3. Add two drops of iodine solution to each sample
4. Record color of solution
   -safety: safety goggle + lab coat

Question 15

Method for Biuret test for Protein

Answer 15

1. Place sample food in test tubes and number them
2. Add 2 cm^3 (20 drops) of biuret reagent to samples
   (if food is dry add 5 drops of distilled water
3. Record color of reagent
   -safety: safety goggles + lab coat

Question 16

Method for Emulsion (ethanol) test for Lipids (fats)

Answer 16

1. Place food samples in a test tube and number them
2. Add 2 cm^3 (20 drops) of ethanol to the food samples
3. Shake the tube for 10 seconds
4. Pour sample into tube of distilled water
5. Record the color of reagent
   safety: safety goggles + lab coat

Question 17

Method for Benedict’s test for reducing sugars

Answer 17

1. Place food samples in a boiling tube and number them
2. Add 2 cm^3 (20 drops) of Benedict reagent to food samples
3. Place the tube into a boiling water bath (carefully)
4. Leave for 3-4 minutes
5. Remove carefully with a test tube holder
6. Record color of the reagent
   -safety: safety goggles + lab coat + avoid contact with skin