Vitamin C

[bauke]

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.

Bauke

[sdekivit]

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.

[bauke]

okay... So this chemical breaks down the Vitamin C? and its found in oranges and bananas?

[MrMistery]

no, the chemical which breaks down the vitamin is found in bananas. The vitamin itself is found in oranges...

[Dustfinger]

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

[MrMistery]

Well that depends on the medium in which that chemical acts. I have never heard of it before either.

[sdekivit]

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

[Dustfinger]

Oh, good point then. I quite often eat them together.....

[sachin]

How does the Vit.C (Ascorbic Acid) is used in our body?..

[Dustfinger]

Don't tell me you don't know what Vitamin C does !!!

[micching1204]

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....

[Dustfinger]

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