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Biology > Food tests > Flashcards

Food tests Flashcards

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1
Q

What is the test for sugars?

A

Benedicts test

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2
Q

What is the test for Starch?

A

Iodine test

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3
Q

Biuret is used to test for what?

A

Proteins

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4
Q

the Emulsion test is used to test for what?

A

Lipids

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5
Q

For food tests, how would you prepare your food sample?

A

Break it up using a mortar and pestle.
Put the crushed food into a beaker with distilled water
Stir it with a glass rod until some of it dissolves
Filter out the solution using a funnel that has been lined with filter paper

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6
Q

All carbohydrates are made of what?

A

Sugars

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7
Q

What are the two types of sugar?

A

Reducing and non reducing sugars

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8
Q

What type of sugar does the benedicts test ONLY test for?

A

Reducing sugars

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9
Q

What temperature do you set the water bath for in the test for sugar?

A

75 degrees

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10
Q

How many drops of benedicts solution do you add?

A

10 drops

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11
Q

How long do you place the test tube in the water bath for when doing the test for sugars?

A

5 minutes

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12
Q

If reducing sugars aren’t present what colour will the solution turn to?

A

Blue

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13
Q

If reducing sugars are present what colour will the solution turn?

A

.Green
.Yellow
.Brick red (depending on the concentration)

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14
Q

What colour will your solution turn to after adding a few drops of iodine solution?

A

Browny-orange colour

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15
Q

If your solution does contain starch what will it change colour to?

A

Blue/black

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16
Q

If your sample contains protein it will turn from blue to what colour?

A

Pink/Purple

17
Q

What do you add during the biuret test?

A

Potassium Hydroxide and Copper Sulfate

18
Q

You add an equal volume of what to your emulsion test AFTER you have added ethanol and have shook it.

A

Distilled water

19
Q

If Lipids are present what colour will your solution go?

A

Cloudy White

Biology (22 decks)

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