- Free Essays, Term Papers, Research Papers and Book Reports


By:   •  October 10, 2016  •  Study Guide  •  298 Words (2 Pages)  •  817 Views

Page 1 of 2


Hexoses + 6 carbons eg. Glucose, Galactose


Can form a 6 membered pyranose ring, or

5 membered furan ring, eg. Fructose

Pentoses + 5 carbons eg. Xylose, Arabinose

“Anomeric” carbon in the ring form

Can form the glycosidic bond with another sugar molecule

Glycosidic Bond

Formed between 1 carbon of one sugar ring

& any other carbon with a free hydroxyl group

The 2 rings become linked through an Oxygen

Most common combinations with 3 or 4 carbon

1-3, or 1-4 glycosidic bond


2 sugar units joined together by a glycosidic linkage

Common disaccharides


Glucose 1-2 fructose


Galactose 1-4 glucose


Glucose 1-4 glucose

Polysaccharide S tarch

Food = Starch?

What is it?

Where do we find it?

What does it do there?

How is it produced?


Relatively short chains

Molecular weight up to 5000 d.p. = ?

Polysaccharide chain length not fixed

Easily soluble in water

Adopts a helical conformation

Two chains can intertwine to form a double helix


What determines solubility?

Requires close interaction between solute and solvent, so solute behaves just like a solvent molecule.

Why are large molecules less soluble?

Ordering of solvent molecules around solute incurs a decrease in entropy of the system.

From 2nd law of thermodynamics, the entropy of any spontaneous process must increase


Download:  txt (2.3 Kb)   pdf (44.6 Kb)   docx (9.3 Kb)  
Continue for 1 more page »