in titration .or any other method
How do you test vitamin C in broccoli?
You mention titration, so you want to know about quantitative analysis, I suppose.
Here you find details about methods to determin the amount of ascorbic acid in different plant ( and animal ) tissues:
ferricyanide method,
colorimetric determination,
indicator method
and a "new method"
http://www.jbc.org/cgi/reprint/108/2/563...
Quantitative and qualitative analysis can be made by chromatography f.e.
There are also a lot of modern methods like reversed phase HPLC analysis or spectrophotometric determination .
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