Clarification of date varieties Kaluteh juice using bentonite and gelatin

In this study، response surface methodology and face central composite design in order to investigate decolorization and clarification extraction of Kaluteh date was used for the production of liquid sugar. The optimum amount of bentonite (1-3 g/l) and gelatin (0/02-0/08 g/l) was determined that the desired amount of bentonite and gelatin، 3 and 0/05 (g/l)، respectively. To determined the optimum conditions for maximum activity of these two compounds for clarification with regard to fixed amount of bentonite and gelatin، three factors determine the temperature (30-70 °C)، pH (4-6) and time (40-120 min) was implemented. Parameters consists of the colors، ash and absorbance. Bentonite and gelatin at low temperature and pH with over time، more active and reduce the mount of impurities. The least amount of this responses for the color at 420 (nm)، ash and absorbance at 660 (nm)، 4302 Icumsa، 0/421 % and 0/059، respectively. By comparing amounts in the optimum point the clear syrup by bentonite and gelatin، the initial syrup، it was found that this technique able to reduce the mount syrup color، ash and absorbance، 68/25 %، 8/7 % and 89/46 %، respectively.