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Edible films based on gluten from four types of Brazilian wheat gluten (2 "semi-hard" and 2 "soft") were prepared and mechanical and barrier properties were compared with those of wheat gluten films with vital gluten. Water vapor, oxygen permeability, tensile strength and percent elongation at break, solubility in water and surface morphology were measured. The films from "semi-hard" wheat flours showed similar water vapor permeability and solubility in water to films from vital gluten and better tensile strength than the films from "soft" and vital gluten. The films from vital gluten had higher elongation at break and oxygen permeability and also lower solubility in water than the films from the Brazilian wheat "soft" flours. In spite of the vital gluten showed greater mechanical resistance, desirable for the bakery products, for the purpose of developing gluten films Brazilian "semi-hard" wheat flours can be used instead of vital gluten, since they showed similar barrier and mechanical properties. Filmes à base de glúten de quatro tipos de farinhas de trigo brasileiras (2 "semi-fortes " e 2 "fracas") foram preparados e suas propriedades mecânicas e de barreira foram comparadas com filmes com glúten vital (comercial). Permeabilidade ao vapor d'água e oxigênio, resistência à tração, porcentagem de elongação na ruptura, solubilidade em água e morfologia de superfície foram medidas. Filmes de glúten das farinhas "semi-fortes" mostraram similar permeabilidade ao vapor d'água e solubilidade em água em comparação aos filmes de glúten vital e melhor resistência à tração do que os filmes das farinhas "fracas" e glúten vital. O filme de glúten vital apresentou maior elongação na ruptura e permeabilidade ao oxigênio do que os filmes das farinhas brasileiras e ainda mais baixa solubilidade que as farinhas fracas. Apesar do glúten vital ter uma grande resistência mecânica, desejável para produtos de panificação, para o propósito do desenvolvimento de filmes comestíveis as farinhas de trigo "semi-duras" brasileiras podem ser usadas ao invés do glúten vital, já que elas mostraram propriedades de barreira e mecânicas similares

food science and technology

Development and characterization of edible films based on gluten from semi-hard and soft Brazilian wheat flours (development of films based on gluten from wheat flours)