what is reduced and oxidzed?

[DJPaulyDDS]

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hey all,

Does anyone mind posting a link or explaining what gets oxidized and reduced during glycolysis and the other reactions involved in respiration?

Im pretty sure that glucose is reduced but im unsure about other intermediates such as NAD+ etc.

And also interms of aldol condensations and reaction similar to it. how do we know when we loose a mole of h2o? is it always? or just when heat is applied.

Thanks guys,

 

[kcola]

hi, glucose is oxidized. fad/nad are reduced as they take high-E electrons from the breakdown of glucose and use them to power the H+ gradient in the inner mito membrane... here, the intermediates are oxidized as they give up these electrons.

http://www.khanacademy.org/video/oxidation-and-reduction-in-cellular-respiration?playlist=Biology

http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/C/CellularRespiration.html

remember, when one molecule is oxidized, the other must be reduced. (redox happens in pairs.)

 

[Kahr]

hey all,

Does anyone mind posting a link or explaining what gets oxidized and reduced during glycolysis and the other reactions involved in respiration?

Im pretty sure that glucose is reduced but im unsure about other intermediates such as NAD+ etc.

And also interms of aldol condensations and reaction similar to it. how do we know when we loose a mole of h2o? is it always? or just when heat is applied.

Thanks guys,

In regard to the aldol condensation. You will lose water when heat is added. When heat is not added, it will stop as a Beta-hydroxy ketone (still has the OH), whereas when heat is involved you will form an alpha-beta unsaturated ketone (double bond between alpha and beta carbon) with water liberated. Technically, the reaction is only an aldol condensation when water is liberated, without heat it can be called an aldol reaction.

Be forewarned though, it is possible that some evil test makers will simply leave out heat and based on the answers given, leave it to you to assume heat is there and that a condensation takes place. I'm sure it will be obvious when this is the case based on the possible answer choices.

 

[tendram]

Always remember OIL RIG: Oxidation Is Loss (of electrons), Reduction Is Gain (of electrons). Or you can look at it in organic reactions as oxidation=gain of oxygen and reduction=gain of hydrogen. If you keep these two rules in mind you wont have to memorize what is oxidized or reduced in a particular reaction so long as you know the reactants and products.