1.Cleaned , Stewed (water/sweet potato ratio of 1:6 (w/w).
2. Cooking temperature 100 C and cooking time 25 min) and manually peeled.
3. Homogenized with the aid of a household blender to produce purple sweet potato puree
4. The contents of anthocyanins, flavonoids and total phenolics, on dry basis in puree were 44.28 mg/100 g,1.217 g/100 g and 2.504 g/100 g respectively.