Required practical - Food testing (AQA GCSE Biology Combined Science): Flashcards
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Practise the cards
10 cards from this deck
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Practise the cards
10 cards from this deck
What do qualitative food tests show?
What do qualitative food tests show?
Whether a nutrient is present or absent (not the exact amount)
Benedict's solution tests for
Benedict's solution tests for
Reducing sugars (e.g., glucose and fructose)
Iodine solution tests for
Iodine solution tests for
Starch
Sudan III stain tests for
Sudan III stain tests for
Lipids (fats and oils)
Biuret reagent tests for
Biuret reagent tests for
Proteins
Benedict's test positive result colour
Benedict's test positive result colour
Blue → green → orange → red
Iodine test positive result colour
Iodine test positive result colour
Orange-brown → blue-black
Sudan III test positive result
Sudan III test positive result
Red layer appears on top
Biuret test positive result colour
Biuret test positive result colour
Blue → pink or purple
Benedict's test heating time required
Benedict's test heating time required
5 minutes in hot water bath