B2.1.2 - Food Tests Flashcards

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1
Q

Which solution do we use to test for sugars?

A

Benedict’s solution

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2
Q

Which solution do we use to test for starch?

A

Iodine solution

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3
Q

What colour is Benedict’s solution when it contains no simple sugars?

A

Blue

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4
Q

What colour is iodine solution when there is no starch present?

A

Orange

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5
Q

What colour is iodine solution in the presence of starch?

A

Blue/Black

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6
Q

How do we prepare a food sample?

A
  1. Crush the food with a pestle and mortar.

2. Add a few drops of distilled water and mix well.

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7
Q

What is distilled water?

A

Pure water (it contains no other chemicals)

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8
Q

How do you test for starch?

A
  1. Add a few drops of iodine solution to a food sample.

2. If solution turns blue/black starch is present.

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9
Q

How can you test for SOLID lipids?

A
  1. Rube the piece of food on filter paper.
  2. Hold paper to light source.
  3. If paper turns translucent - lipids are present.
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10
Q

What does translucent mean?

A

Slightly see-through

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11
Q

How can you test for lipid in a food solution (LIQUID)

A
  1. Add a few drops of ethanol to the food solution.
  2. Shake tube and leave for 1 minute.
  3. Pour ethanol into a tube of water.
  4. If solution turns cloudy - lipids are present.
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12
Q

How do you test for simple sugars?

A
  1. Add a few drops of Benedict’s solution to the food sample.
  2. Heat the test tube in a water bath.
  3. If the solution turns orange/red the food contains simple sugars.
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13
Q

How do you test for protein?

A
  1. Add a few drops of copper sulfate to food solution.
  2. Add a few drops of sodium hydroxide.
  3. If solution turns purple - proteins are present.
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14
Q

What colour is copper sulfate solution?

A

Blue

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