CIE A Level Biology復習筆記2.2.3 Reducing & Non-Reducing Sugars

Category: A-level課程, 教材筆記, 福利干貨 Date: 2022年8月10日上午10:51

Reducing & Non-Reducing Sugars

Sugars can be classified as reducing or non-reducing; this classification is dependent on their ability to donate electrons
Reducing sugars?can?donate electrons (the carbonyl group becomes?oxidised), the sugars become the?reducing agent
- Thus reducing sugars can be detected using the Benedict’s test as they reduce the soluble copper sulphate to insoluble brick-red copper oxide
- Examples:?glucose, fructose, maltose
Non-reducing sugars?cannot?donate electrons, therefore they cannot be oxidised
- To be detected non-reducing sugars must first be hydrolysed to break the disaccharide into its two monosaccharides before a Benedict’s test can be carried out
- Example:?sucrose

OILRIG

The mnemonic to remember the definitions for oxidation and reduction

Exam Tip

Become familiar with the OILRIG mnemonic to remember what happens to a molecule when electrons are lost from it (oxidation) or gained by it (reduction).

轉載自savemyexams

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