Food Tests - Starch And Sugars Flashcards

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1
Q

Explain the process for test for starch

A
  1. Test solution in test tube
  2. Iodine in potassium iodide solution
  3. Gently mix by swirling
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2
Q

What is the positive result for the starch test?

A

Browny orange to blue-black

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3
Q

Explain the test for reducing sugars

A
  1. Test solution in boiling tube
  2. Equal volume of Benedict’s reagent
  3. Heat for 5 mins
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4
Q

What is the positive result for reducing sugars?

A

Blue to orangey red

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5
Q

Explain the test for non reducing sugars

A
  1. Test solution in boiling tube
  2. Equal volume of Benedict’s reagent
  3. Heat mixture
  4. Record colour - not a reducing sugar if remains blue
  5. Test solution in boiling tube
  6. Add hydrochloric acid
  7. Heat
  8. Sodium hydroxide to neutralise
  9. Add Benedict’s reagent
  10. Heat for 5 mins
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6
Q

What is the positive result for non reducing sugar test?

A

Blue to orangey red

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