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RELEVANT LEARNING OUTCOME:
(a) Describe the structure and properties of the following monomers: alpha-glucose and beta-glucose.
Structure of Monosaccharides
Structure of Monosaccharides
Watch the video from 0:00 to 1:55 to learn more about the structure and some properties of monosaccharides.
💡α-glucose and β-glucose
💡α-glucose and β-glucose
α-glucose
α-glucose
α-(alpha)-glucose has the hydroxyl group BELOW the plane of the ring.
β-glucose
β-glucose
β-(beta)-glucose has the hydroxyl group ABOVE the plane of the ring.
Use the following acronym to help you with remembering the above: ABBA (Alpha is below, Beta is above)
Alpha-glucose (left) has its hydroxyl group on C1 below the plane, while beta-glucose (right) has its hydroxyl group on C2 above the plane.
Watch the video below to understand the difference between the two glucose isomers.
🕹️Simulation!
🕹️Simulation!
Explore the structure of α and β-glucose using the simulation below.
Identify carbon 1
Compare how the OH group at carbon 1 is different for α and β-glucose
(we will come back to amylose and cellulose in the following sections)
🖊️Check Your Understanding: Learning Goals Checkpoint
🖊️Check Your Understanding: Learning Goals Checkpoint
How is α-glucose different from β-glucose?
Alpha glucose has its hydroxyl group on C1 below the plane of the ring.
Beta glucose has its hydroxyl group on C1 above the plane of the ring.
Properties and Roles of Monosaccharides
Properties and Roles of Monosaccharides
Physical properties
Physical properties
Small, sweet, crystalline in appearance, and readily soluble in water (i.e. form favourable interactions with water)
Chemical properties
Chemical properties
All monosaccharides are reducing sugars (see Benedict's Test under 'Disaccharides').
The sugar you put into your foods and drinks is a type of monosaccharide and has a crystalline appearance (looks like crystals).
🖊️Check Your Understanding
🖊️Check Your Understanding
Attempt Qns 1 to 3 of the Carbohydrates Learning Goals.
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