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.
Compliments of www. manuscriptex.com
A sweet potato
Irish potatoes do have more electricity!They are also the yummiest!
The main differences between a potato and a sweet potato are their appearance, taste, and nutritional content. Potatoes have a smooth skin and white flesh, while sweet potatoes have a rough, reddish-brown skin and orange flesh. Sweet potatoes are sweeter in taste and have more vitamins and minerals than regular potatoes.
It can be measured by UV- spectrophotometer. The pH differential method has been used to determine the anthocyanin content
Some delicious recipes that feature spongy sweet potato as the main ingredient include sweet potato casserole, sweet potato fries, sweet potato pancakes, and sweet potato pie.
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
Sweet potato is a fibrous root because the potato itself is the root.
Considering potato's are plants. I'd suppose it is the starch granules since they are specialized plastids for storing carbon hydrates.
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
root