Re: Which fruit juice has the most vitamin c content?

One of the best source of information is the Nutrient Data Laboratory of the USDA at http:// www.nal.usda.gov/fnic/foodcomp.

Browsing there, I was able to find those vitamin C values (mg per cup):

orange: 50
apple: 41
grape: 24
tomato: 18
grapefruit: 38
Sunny Delight: Not available

Please note that these values may depend on the kind of juice: fresh, made from concentrated with vitamin C added or not, etc.

An interesting experiment to do in school is to measure the content of vitamin C yourself. There are many well written methods on the web, including this one:

http://www.eecs.umich.edu/~coalitn/sciedoutreach/ funexperiments/quickndirty/csustan/vitaminc.htm