THE APPLICATION OF CASSAVA STARCH FROM TWO CASSAVA (Manihot esculenta Crantz) CULTIVARS AS A BIODEGRADABLE PLASTIC PRODUCT.
Keywords:Cassava starch, Biodegradable film, Glycerol, Plasticizer
The purpose of this research was to study the effect of using glycerol as a plasticizer on physical and mechanical properties of the film made of cassava starch. Two cultivars of the cassava, Ha-Na-Tee and Rayong 2, were used in this study. The preparation of the film was performed by dissolving cassava starch in water to the concentration of 5 wt% and the glycerol was added at 4 levels; 0, 20, 30 and 40 wt%. The film was casted in a mold and dried at 60 oC for 18 h. The properties; thickness, water activity (aw), solubility, tensile strength (TS), puncture strength, and the degradation of the films were evaluated. The thickness of the films was in the range of 0.20-0.30 mm. The aw value of films ranged from 0.40 to 0.50. The cassava starch of both cultivars could form flexible films by using glycerol as a plasticizer. The solubility of the film was increased with the increase of glycerol content. Tensile and puncture strength of the starch film were increased with the decrease of the glycerol content. After the films were buried under the ground for 2 weeks, they were degraded by 55-58 %. This degradation increased with the increasing of glycerol content. These results indicated that the cassava starch films were biodegradable which could help reduce the amount of the non-biodegradable packaging waste.
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