Furanoses and Ketoses

[a_zed24]

Hello there,

I was wondering about the fact that fructose's chain rings up as a furanose...is there any correlation between ketose sugars and furanose rings in general? In other words, do all ketoses form a furanose ring?

Thanks!

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[NextStepTutor_4]

Hi @a_zed24! You may be comparing apples and oranges here. Furanose as you may know contain a 5-membered ring with 4 carbons and an oxygen. Of note, a furanose does not have any ketone groups. Furanose can be formed from an aldehyde (which does contain a ketone group) through a reduction reaction. A ketose is a term used to describe a simple carbohydrate (monosaccharide) and contains a ketone group. Examples of ketoses include dihydroxyacetone, ribulose, and fructose and those differ by the number of carbons each molecule contains. Pentoses such as ribulose can form a furanose but not all ketoses can form furanose.

Hope this helps!

 

[a_zed24]

Hi @a_zed24! You may be comparing apples and oranges here. Furanose as you may know contain a 5-membered ring with 4 carbons and an oxygen. Of note, a furanose does not have any ketone groups. Furanose can be formed from an aldehyde (which does contain a ketone group) through a reduction reaction. A ketose is a term used to describe a simple carbohydrate (monosaccharide) and contains a ketone group. Examples of ketoses include dihydroxyacetone, ribulose, and fructose and those differ by the number of carbons each molecule contains. Pentoses such as ribulose can form a furanose but not all ketoses can form furanose.

Hope this helps!

Thanks a lot, it has surely helped me!