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Summary AQA A Level Biology- Food tests Unit 1
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Notes on the tests for carbohydrates, lipids and proteins sub-topic within AQA A Level Biology Unit 1- Biological Molecules. These notes contain sub headings with different methods of note taking like tables, images from online videos and concise bullet points.

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  • September 7, 2024
  • 5
  • 2024/2025
  • Summary

Subjects

  • biology
  • biological
  • molecules
  • biological molecules
  • tests
  • carbohydrates
  • lipids
  • proteins
  • food tests
  • aqa
  • a level

Written for

  • A/AS Level
  • AQA
  • A Level Biology
  • Unit 1 - Biological molecules
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⚪
Tests for Carbohydrates, Lipids
and Proteins

Tests for carbohydrates:
Benedict’s test- reducing sugars:

Tests for reducing sugars- carbohydrates.
A reducing sugar is a sugar that can give electrons to (reduce) other molecules.
They include all monosaccharides and most disaccharides like maltose and
lactose.




The sample to be tested is placed in a clean test tube

An equal volume of Benedict’s reagent (copper (||) sulfate) is added using a
pipette




Tests for Carbohydrates, Lipids and Proteins 1

, The solution is then heated in a boiling water bath for 3-5 minutes.




If reducing sugars are present, they will reduce the Cu2+ ions in copper (||)
sulfate to Cu+ ions, forming the orange-red precipitate copper (|) oxide.




Tests for Carbohydrates, Lipids and Proteins 2

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