Nutrition Science Fair Project?

Hi,

I'm interested in doing a food-related project for the science fair this year, and have thought of comparing the nutritional benefits of organic vs. inorganic citrus fruits. I have several questions:
1) Is it possible to measure the exact amount of fiber in a particular food? If so, how?
2) What about measuring vitamin or mineral content in a fruit? I'm aware of the awfully cliché vitamin C thing, but what about vitamins A,E,B,D, etc., or iron and zinc?
3) Could you give me a basic description of paper chromatography? 

Any help will be apprecited.

I didn't find the right solution from the Internet. 

References:

Thank you.

















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