Physical and Chemical Properties of Potato Starch Film: Effect of Adding Sorbitol

Abstract

The purpose of this research was to study film production from potato starch and to study the physical and chemical properties of the potato starch film. Ten grams of potato starch and 0, 1, 3, and 5 g of sorbitol were dissolved in 200 ml of distilled water, stirred, and heated at 80 °C for 2 hrs. To form starch film, 100 grams of the starch solutions were poured into a mold of acrylic sheet sized 12 x 8 squared centimeters and dried at 50 °C for 3 hrs. The films were then tested for physical and chemical properties, e.g. texture, thickness, tensile strength, stretch percentage, and water solubility. The results showed that the appearances of the films were clear and translucent, with the addition of plasticizer, and sorbitol, increased flexibility and not easy to brittle, crumple, or break. The formulas without plasticizers were brittle, crumpled, cracked, and not flexible from potato starch with a sorbitol ratio of 0, 1, 3, and 5 grams, the film had an average thickness of 51.00, 60.30, 96.00 and 74.30 micrometer, respectively and an increase in elasticity. When the amount of sorbitol increased. The average values were 8.44, 10.67, 18.92 and 38.26 percent, respectively, but the tensile strength decreased, with average values of 43.72, 31.67, 9.02 and 4.61 Mpa, respectively. The water solubility test results were found the film was more soluble in water when sorbitol was added. The average water solubility percentages were 26.63, 46.08, 47.67 and78.88 respectively. The experimental results showed that potato starch mixed with sorbitol could produce biofilm.