... sweet potato with remove the peel,dehydrate, steam cooking and dry. Purple Sweet Potato Starch- Purple Sweet Potato powder ... Retaining all dry matter:Protein,fat, carbohydrate, Vitamin, mineral and dietary fiber except the skin of purple sweet potato. ... of anthocyanins, VC has scavenging free radicals, antioxidation, and anti-aging efficacy, and can be used to slow down inflammation in asthma disease ...