Formulasi serbuk tahu sutera instan menggunakan metode respon permukaan (response surface methodology)

Abstract

Tofu is one of the popular food product in Asia. Tofu is a gel of soy protein that has a delicious taste, soft texture, cheap in price, easily digestible and has high protein content. Tofu is a product that has a short shelf life due to its high water content, especially in the raw form so there are frequently encountered cases of formalin using to extend the shelf life of tofu. Production of tofu by using silken tofu powder (premix) is expected to be the solution of this problem. The aim of this study is to find the best formula of silken tofu powder and optimize the process (coagulation time and temperature) using response surface methodology. Result of the first stage in this study showed the selected main raw material was soy milk powder, the ratio of silken tofu powder and water was 1:2, the range of GDL was 1- 1,5%, the range of STPP was 0,05% - 0,15%, the range of Na2HPO4 and NaH2PO4 was 0,125% - 0,175%, the range of coagulation time was 30-50 minutes and the range of coagulation temperature was 70-90oC. The response surface methodology performed in the second stage of this study. It shows that the selected formula for silken tofu powder is GDL 1 %, STPP 0,06%, and Na2HPO4 and NaH2PO4 0,125% and for coagulation time and temperature are 49 minutes and 89oC. Measured texture response of silken tofu made from the chosen formula and the optimum coagulation time and temperature is 149.3 gf.