Nutrition composition of sweet potatoes of different colors

The nutrition composition of sweet potatoes with different colors was analyzed.The results showed significant differences among three types of sweet potatoes in the contents of vitamin C,β-carotene,protein,carbohydrate,Cu,Fe,Mn,Mg,Zn and Ca.The orange-colored sweet potatoes had the highest level of β-carotene,and the lowest carbohydrate and Zn contents.The purple sweet potatoes were rich in protein,Zn,Fe,Mn,Mg and Ca,but poor in vitamin C.The sweet potatoes with yellow flesh had a Zn content between those with orange-and purple-colored flesh.