Abstract:
The aim of this work was to make 3 methodologies to prepare okud sweet potato flour were studied by the variation of temperature processes. In this study, the use of each okud sweet potato flour to replacement substitute the wheat flour in doughnut cakes. The transformation of okud sweet potato into flour are divided into 3 routes. It is made as follows: peeling the okud sweet potatoes skin and slide it 1 millimeter thickness of the okud sweet potatoes. 1) Non-heating process. 2) Boiling process. 3) Steaming process. The results showed that the non-heating process make reddish orange okud sweet potato flour, boiling process make yellowish orange okud sweet potato flour and steaming process make orange okud sweet potato flour. From the process of producing okud sweet potato without the heat, the color is the lighten. The sensory evaluation from all kinds of okud sweet potatoes flour, the flour from the non-heating process was chosen instead of the plain flour in doughnut cakes. Because it has the highest score of sensory acceptance. Boiling process and steaming process to make the lost yellow color because beta-carotene is usually reduced when heated. But when you use okud sweet potato flour make by heating process mixed with other ingredients in doughnut cakes. The batter of doughnut cakes is suck the water, change to tight and thick. After bake doughnut cakes texture of product is heavy and stiff but doughnut cakes use non-heating process batter is not suck the water and texture of product is solf and spongy. The doughnut cakes were prepared by using okud sweet potato as wheat flour substitution in the different ratio of okud sweet potato flour and wheat flour 5 level. From the results of sensory evaluation, it can be concluded that the optimum partially substituted was 30 percent okud sweet potato flour.