Required practicle 4 - Food tests Flashcards

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1
Q

What is required for all food tests?

A

• Grind food sample with water to make paste
• Transfer to beaker, add more distilled water and stir so food dissolves

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2
Q

What is the test for starch?

A

• Add iodine
• Turns from orange to blue/black if present

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3
Q

What is the test for glucose?

A

• Add 2cm^3 sugar solution and10 drops benedicts solution
• Place test tube in beaker half-filled with boiling water and leave for around 5 minutes
• If present turns from blue to green/yellow/brick-red depending on amount present

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4
Q

What is the test for protein?

A

• Add biuret solution
• If present turns from blue to purple/lilac

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5
Q

What is the test for lipids?

A

• dont filter solution as lipid molecules can get stuck to filter paper
• add few drops of distilled water and ethanol then gently shake
• If present solution forms white cloudy emulsion

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6
Q

What is a hazard when testing for lipids?

A

• Ethanol is highly flammable
• So ensure no naked flames are present

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