A Level Biology - Carbohydrate Tests | Test For Reducing & Non-Reducing Sugars | Starch

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*** WHAT'S COVERED ***
1. Definition and examples of reducing sugars
* Ability to donate electrons
* Includes all monosaccharides (e.g., glucose) and some disaccharides (e.g., maltose, lactose)
2. Definition and examples of non-reducing sugars and carbohydrates
* Inability to donate electrons without prior hydrolysis
* Includes most disaccharides (e.g., sucrose) and all polysaccharides (e.g., starch)
3. How to test for reducing sugars (Benedict's Test)
* Procedure involving Benedict's reagent and heating
* Interpretation of results based on colour changes (blue, green, orange, brick-red)
4. How to test for non-reducing sugars
* Requirement for acid hydrolysis and neutralisation before performing the Benedict's test
* Interpretation of results after the hydrolysis step
5. Quantitative methods for measuring sugar concentration
* Using a colorimeter to measure light absorbance
* Filtering and weighing the mass of the precipitate formed
6. How to test for starch (Iodine Test)
* Procedure involving iodine solution
* Interpretation of results based on colour change (orange/brown to blue-black)

*** CHAPTERS ***
0:00 Introduction
0:25 Reducing & Non-Reducing Sugars
1:32 Test for Reducing Sugars (Benedict's Test)
2:31 Test for Non-Reducing Sugars
3:39 Quantitative Sugar Measurement
4:15 Test for Starch (Iodine Test)

*** PLAYLISTS ***






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