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Specialty Chemistry Forums => Biochemistry and Chemical Biology Forum => Topic started by: megarushan on January 15, 2015, 12:55:08 PM

Title: why is that sucrose is a non reducing suger
Post by: megarushan on January 15, 2015, 12:55:08 PM

(https://www.chemicalforums.com/proxy.php?request=http%3A%2F%2Fwww.wpclipart.com%2Fscience%2Fatoms_molecules%2Fmolecules%2Fsucrose.png&hash=64f1fb321ebaadcf5b57e8eaa3db99c32b8c75fb)

sucrose doesn't have free anomeric c .it is ok..but it have hydroxyl group..why is that hydroxyl group can't oxidize..

Title: Re: why is that sucrose is a non reducing suger
Post by: kriggy on January 15, 2015, 01:04:36 PM

Because it cant be easily reduced. If you reduce OH group, then you are left with CH3. THis reaction is not that easy

Title: Re: why is that sucrose is a non reducing suger
Post by: megarushan on January 15, 2015, 02:18:11 PM

Quote from: kriggy on January 15, 2015, 01:04:36 PM

Because it cant be easily reduced. If you reduce OH group, then you are left with CH3. THis reaction is not that easy

yes it can't be easily reduce , but i think it can be easily oxidize to carboxyl group...
my question is why sucrose (hydroxyl group) cant be oxidize by benedict reagent..

Title: Re: why is that sucrose is a non reducing suger
Post by: Babcock_Hall on January 15, 2015, 03:30:43 PM

@OP, Your first post mentioned something about the anomeric position, which is worth keeping in mind.  Let's do this step-by-step.  What functional groups are oxidized in typical monosaccharides, such as glucose or fructose?  Hydroxyl groups do not oxidize under these conditions (or sucrose would react).

@Kriggy, It is because sucrose cannot be easily oxidized, but other sugars can be.