B2 - Food tests Flashcards

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1
Q

How would you test for carbohydrates?

A

Add Benedict’s reagent to food and BOIL in water bath

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2
Q

How can you carry out a test for carbohydrates properly?

A

Boil the sample.

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3
Q

What is the initial colour of Benedict’s solution?

A

Blue

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4
Q

What will happen if carbohydrates are not present in the sample?

A

It’ll stay blue.

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5
Q

What will happen if carbohydrates are present in the sample?

A

It’ll turn brick red.

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6
Q

How would you test for starch?

A

Add iodine reagent to food

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7
Q

What is the initial colour of iodine?

A

Brown/orange

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8
Q

What will happen if starch is present in the sample?

A

It’ll turn blue black

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9
Q

What will happen if starch is not present in the sample?

A

It’ll stay brown/orange

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10
Q

How would you test for protein?

A

Add Biuret reagent to food

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11
Q

What is the initial colour of Biuret reagent?

A

Blue

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12
Q

What colour will the sample turn if protein is present?

A

Lilac/purple

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13
Q

How would you test for fat (lipids)?

A

Add ethanol to the food to dissolve the fat then add water

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14
Q

What will happen to the sample if fat is not present?

A

It will stay colourless

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15
Q

What will happen if fat is present in the sample?

A

White emulsion.

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