Nutrients in fresh versus frozen spinach

Question
You gave such a helpful answer to my recent question (about hulled millet) that I'd like to bring to you another nutritional question on my mind of late. How much of the nutritional value of spinach (i.e. of fresh or frozen) survives the canning process?  Thanks.

Answer
Andrew,

Thanks for your kind word :)

I found it difficult to compare raw and frozen spinach directly because of the different density of different forms, but I do have data concerning spinach cooked from fresh, canned, and frozen spinach.

Spinach cooked from frozen is higher than cooked from fresh in vitamins A, B6, B12, even C. It's also higher in calcium, copper, magnesium, and zinc.

All the details can be found here:
http://atkinszone-recipes.blogspot.com/2008/09/nutrients-in-fresh-canned-and-fro...

On the other hand, practically all nutrient contents are reduced in canned spinach. BTW, tomatoes are different - some of their health benefits don't disappear in the canned ones:
http://atkinszone-recipes.blogspot.com/2006/03/tomato-tips-dont-forget-about-can...

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