PEMANFAATAN UBI JALAR UNGU (Ipomoea batatas L. Poir) SEBAGAI PENGGANTI SEBAGIAN TEPUNG TERIGU DAN SUMBER ANTIOKSIDAN PADA ROTI TAWAR [Purple Sweet Potato (Ipomoea batatas L. Poir) as a Partial Subtitute of Wheat flour and Source of Antioxidant on Pla

Purple sweet potato ( Ipomoea batatas L. Poir) is potential for functional food, especially as antioxidant source due to its purple color and other nutrient content. The objective of this research was  to produce plain bread containing antioxidant by partial substitution of wheat flour with purple sweet potato flour. The result showed that the best plain bread was produced by a maximum substitution of 20% purple sweet potato flour to wheat flour. The hedonic characteristics of the resulting bread including aroma, taste, and texture were not significantly different from bread without substitution. Nevertheless, the crust was harder and darker. Addition of 1.0% GMS emulsifier and reduction of purple potato flour to 15% increased the score of softness, hedonic  texture, acceptance level, as well as the volume of the bread. The substituted bread had  antioxidant activity of 55833.78 ppm DPPH as shown by the IC 50 value and contained  4.30% of dietary fiber.