ResumoNeste trabalho foram estudados os efeitos plastificante e antiplastificante do glicerol e do sorbitol sobre as propriedades de sorção de água e mecânicas de filmes de amido de mandioca . Os filmes foram produzidos por casting empregando-se amido de mandioca (3 g/ 100 g de solução filmogênica) e diferentes concentrações de glicerol ou sorbitol (0, 5, 10, 15, 30 e 40 g/100 g de amido). Glicerol e sorbitol apresentaram efeito antiplastificante quando empregados em baixas concentrações (≤ 15 g/100 g amido) e sob baixos valores de atividade de água (≤ 0,58). O efeito antiplastificante pode ser demonstrado pelo decréscimo da hidrofilicidade e da flexibilidade dos filmes nestas condições. Em concentrações mais elevadas de plastificante e sob maiores atividades de água, os plastificantes empregados exerceram o efeito esperado de plastificação. Palavras-chave: Antiplastificação, amido de mandioca AbstractIn this work were studied the plasticizing -antiplasticizing effects of glycerol and sorbitol on moisture sorption and mechanical properties of cassava starch films. Films were produced by casting with cassava starch (3g starch/100 g filmogenic solution) and different concentrations of glycerol or sorbitol (0, 5, 10, 15, 30 and 40 g/100 g starch). Glycerol and sorbitol acted as antiplasticizers when used at a low concentration (≤ 15 g/100 g starch) and low values of water activity (≤ 0,58). The antiplasticizing effect could be demonstrated by the decrease in hydrophilicity and in flexibility of the films at these conditions. At higher concentrations and higher water activity values, the employed plasticizers exerted its plasticizing effect.
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