Elaboração de filmes comestíveis de amido adicionados de polpa de acerola

Abstract

Due to the environmental impact generated by the continued use of inert material derived solely from petroleum derivatives, there was an increase in research aimed at development of films based on biopolymers, as they quickly reincorporate the environment. The biodegradable edible films prepared on the basis of biopolymers can be consumed together with food because they play support roles of nutrients, conservation, improvement of nutritional and sensory characteristics of foods, thereby raising the quality and shelf life of food. In this context, the polysaccharides present themselves as an alternative because they are able to form solid polymeric matrices. This study aimed to characterize and develop flexible thin films made from cassava starch, by the spreading technique (casting), evaluating the effect of cassava starch in the film formation conditions on the variables of the pulp and centrifuged lyophilized and plasticizer film formation from solutions (SS) at 4.0% (w / w) total solids cassava starch in the pulp (34.54, 42, 60, 78 and 85.45%), glycerol (15.86, 20, 30, 40 and 44.14%). The SF were dried at 30 ° C for 24 to 48 hours. The films were placed in relative humidity controlled at 52.9% for six days for further characterization. The films were developed and characterized for thickness, water solubility, water vapor permeability (WVP), water activity, contact angle and mechanical properties. Analyzing the results showed that the thickness reduction was influenced by the interaction between the concentration of pulp and glycerol; the concentration increase pulp reduced the PVA, the concentration increased pulp and glycerol and their interaction influenced the reduction solubility in water, the elevation of glycerol concentration and increased interaction between pulp and glycerol reduced the water activity of the films, the increase of pulp concentration, a decrease of contact angle. Concerning the mechanical properties, it was observed that the strength of drilling was reduced with increasing concentration of pulp and glycerol. There was a reduction of the puncture deformation with increasing concentration of pulp. The rise in pulp reduced the tensile strength of films. The increase in tensile strain was observed with increasing the concentration of pulp and glycerol. The reduction in modulus occurred with increasing concentration of pulp and glycerol, but the interaction between pulp and glycerol influenced by raising the elastic modulus. The increase in pulp concentration caused the increase in vitamin C and beta carotene from the movies.