Well, that's a tricky one to answer, because pigmentation varies widely. As a ballpark on a standard sweet potato, I would say around, but not more than, 42 mg per 100 grams.
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A sweet potato
It can be measured by UV- spectrophotometer. The pH differential method has been used to determine the anthocyanin content
It can better sweet a sweet potato because it already has a lot of energy used inside it
no a sweet potato is a tubers
I have looked at several pages and the two best ones were http://www.bbcgoodfood.com/content/recipes/ingredients/sweet-potato/ and http://allrecipes.com/recipes/fruits-and-vegetables/vegetables/sweet-potato/top.aspx. However, the second website was the better of the two as this has more choice and variety.
Sweet potato is a fibrous root because the potato itself is the root.
sweet potato
root
A sweet potato is a vegetable. Sweet potato's are considered to be a root vegetable because it grows underground. The sweet potato is pinkish orange in color.
Sweet potato reproduces by roots that can grow into new sweet potatoes. -Note that the reproduction methods of the sweet potato and potato are different.
Japanese sweet potato
The Kumara is the Maori sweet potato.