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Vitamin C

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Vitamin C

Postby bauke » Sat Jan 20, 2007 10:37 am

For a school project i am doing something with Vitamin C. Im basically extracting it from potatoes and then getting it to decolourise DC.PIP . Now, i would like to know:
- are there any inhibitors to this reaction?
- If i have a solutino of Vitamin C, and i use it again a week later, will the activity of the vitamin C be the same?

I've tried looking it up on the internet, but i cannot find any information on it anywhere. So, any help would be much appriciated.

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Postby sdekivit » Sat Jan 20, 2007 11:51 am

vitamin C gets oxidised when it comes into contact with air, so the concentration vitamin C will change in time.

you'll probably know that in bananas there is a chemical that breaks down vitamin C. You can use orange juice and banan juice to see the effect on the decolourisation of DCPIP.
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Postby bauke » Sun Jan 21, 2007 5:29 pm

okay... So this chemical breaks down the Vitamin C? and its found in oranges and bananas?
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Postby MrMistery » Sun Jan 21, 2007 6:20 pm

no, the chemical which breaks down the vitamin is found in bananas. The vitamin itself is found in oranges...
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Postby Dustfinger » Mon Jan 22, 2007 9:20 am

What? So bananas kill vitamin C off ?
Does that mean it is are sort of unhealthy to eat bananas with oranges ?
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Postby MrMistery » Mon Jan 22, 2007 4:44 pm

Well that depends on the medium in which that chemical acts. I have never heard of it before either.
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Postby sdekivit » Mon Jan 22, 2007 7:52 pm

never heard of it ? you should do a basic redox titration with the conversion of I(-) <--> I2 with the indicator starch.

--> no it's not healthy to eat bananas and ornages together as was thought a few years ago
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Postby Dustfinger » Tue Jan 23, 2007 9:22 am

Oh, good point then. I quite often eat them together..... :(
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Postby sachin » Tue Jan 23, 2007 12:12 pm

How does the Vit.C (Ascorbic Acid) is used in our body?.. :wink:
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Postby Dustfinger » Wed Jan 24, 2007 8:40 am

Don't tell me you don't know what Vitamin C does !!! :evil:
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Postby micching1204 » Fri Jan 26, 2007 9:59 am

Dustfinger wrote:What? So bananas kill vitamin C off ?
Does that mean it is are sort of unhealthy to eat bananas with oranges ?

haha~
how does banana kill???
i think it'll be alrite to hav thm together~
coz tropical fruit juice owes contains these....
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Postby Dustfinger » Mon Jan 29, 2007 10:29 am

I meant that bananas contain a substance that fights VitaminC ....
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