Abstract

PARDO CUERVO, Oscar Hernando  and  VELASCO MOSQUERA, Reinaldo. Physicochemical and mechanical properties of film obtained from native and oxidized arracacha starch. Rev. ion [online]. 2012, vol.25, n.spe, pp.23-29. ISSN 0120-100X.

Arracacha (Arracacia xanthorrhiza Bancroft) native starch (NS) was oxidized (OS) to develop biodegradable films by changing the concentration of glycerol (Formulation A, B, C, D, E), in order to determine the effect of starch type and concentration of plasticizer on the physicochemical and mechanical properties of the films. The starches were characterized by fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD) and volumetric techniques. The films made with NS presented more transparency than those obtained from OS equal proportions of the plasticizer. NS films had lower water solubility and stability in acid and alkaline conditions, than those obtained with OS. The effect of alkaline conditions was higher than the acidic conditions for the two types of films in all treatments. Regarding to mechanical properties, it was observed that the type of starch and the amount of plasticizer used in the formulation to obtain the films have significant effect (p <0.01) on tensile strength (TS) and percentage of elongation (%E). When using NS for the production of films, there is a higher value in RT and on average it is higher when using the formulation. By using NS obtaining films were presented on average higher %E and it is higher when using the formulation C. Among the two factors that affect the mechanical properties of the films obtained, there was not interaction.

Keywords : oxidized; plasticizer; stability; tensile strength.

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