(Solved) In a disulfide bridge hydrogenation or formation what is oxidized or reduced?

BossMan300

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9 years ago

In a disulfide bridge hydrogenation or formation what is oxidized or reduced?

I have been searching on this for a while. Reduction is gain. Oxidation is loss.
In this reaction, I am having a hard time determining which one is which, because each atom shares one electron from its adjacent atom in every step.

Here is where I was reading:
Although the hydrogenation of disulfides is usually not practical, the equilibrium constant for the reaction provides a measure of the standard redox potential for disulfides:
RSSR + H2 → 2 RSH

http://en.wikipedia.org/wiki/Disulfide_bond

I read a bunch of other places, but I thought this illustrated my situation well.
Thanks.

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bio_man

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9 years ago

Quote from: BossMan300 (9 years ago)

Reduction is gain. Oxidation is loss.

It gains an electron, right? Not necessarily does it gain a hydrogen.

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BossMan300 Author

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9 years ago Edited: 9 years ago, BossMan300

What is "it"? Sulfur. The electron configuration in the SH and SS case shares 1 electron. I don't see electrons gained or lost. Does that make sense?

Post Merge: 9 years ago

Here is another source: http://csrri.iit.edu/~howard/biochem/lectures/proteinstructure.html

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bio_man

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9 years ago

If something gains an electron (reduced), it now has an empty slot for a hydrogen to bond. The opposite is true if it becomes oxidized.

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BossMan300 Author

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9 years ago

In each situation: RSSR, H2, or RSH
Every atom has the same number electrons that it is sharing.
Each Hydrogen in HH, shares one electron with the other hydrogen, the same thing happens in RSH, H shares one electron with S and S shares one electron with H.
Similarly, in RSSR each R shares one electron to each S and each S shares one electron with each R. I don't see any net charge changes on either side of this equation.

Who lost electrons who gained?
RSSR + H2 → 2 RSH

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ortho2122

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9 years ago

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In a disulfide bridge hydrogenation or formation what is oxidized or reduced?

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