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Author Topic: What can chloroplasts reduce?  (Read 66 times)

Vesp

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What can chloroplasts reduce?
« on: May 02, 2009, 09:55:30 PM »
the dark blue DCPIP can be reduced by chloroplasts and light (photosynthesis) to form a colorless solution of DCPIPH2. While DCPIP can be reduced by other things such as vitamin C, it made me wonder what else chloroplasts can reduce? I haven't been able to find any information on the ability for chloroplasts to reduce other substances, but I'm sure it can reduce others. Does anyone know the reduction potential (if that is the right term) for chloroplasts?

I highly doubt this would be useful for reducing P2NP, or anything like that, this is just a little curiosity of mine, and it would be interesting to maybe try and make something from sunlight and a solution with chloroplasts suspended in it.

Quote
The energized electrons are replaced by oxidizing water to form hydrogen ions and molecular oxygen. By obtaining these electrons from water, photosystem II provides the electrons for all of photosynthesis to occur. The hydrogen ions (protons) generated by the oxidation of water help to create a proton gradient that is used by ATP synthase to generate ATP. The energized electrons transferred to plastoquinone are ultimately used to reduce NADP+ to NADPH or are used in Cyclic Photophosphorylation.
---http://en.wikipedia.org/wiki/Photosystem_2

Some more info on the biology lab of DCPIP reduction.. http://bio.classes.ucsc.edu/bio20L/MANUAL/Lab%205.pdf


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Vesp

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Re: What can chloroplasts reduce?
« Reply #1 on: June 10, 2010, 12:04:03 AM »
an old, lost topic.. but maybe it will be revived now at another question - that likely does not have any real usefulness to it, but something that could lead into some interesting conversation...

If chloroplasts have the ability to reduce foreign compounds, such as quinones to hydroquinones, and I assume they have a reduction potential of -0.324 volts because NADP + 2H+ + 2e- ----> NADPH   E'o  = -0.324 V according to http://www.botany.ubc.ca/biol350/topic7.html

my question is -- what can be reduced at -0.324 V? Perhaps something along the way of thebaine to oripavine, or even further to morphine? Plants obviously do it somehow -- could it just be the simple reductive powers from the chloroplast? I doubt it but maybe..

(http://www.ncbi.nlm.nih.gov/pmc/articles/PMC279748/ -- talks about the reduction ability of various things from rats, such as their liver, to reduce thebaine to oripavine to codeine and morphine or something like that)



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