Elaboração e caracterização de filmes biodegradáveis à base de amido de semente de jaca incorporados com antocianinas

Abstract

The interest in biodegradable packaging has grown in recent years due to environmental pollution. Films composed of natural biopolymers such as starch are advantageous because of their availability, can be extracted from the jackfruit seed (Artocarpus integrifolia L.). The preparation of films containing natural pigments such as anthocyanins is promising, because of the color changing ability of these molecules with the pH variation. The objective of this work was to elaborate and characterize starch films incorporated with anthocyanins aiming at the application as intelligent packaging, indicating pH change. Initially, the raw materials were extracted from natural sources. The starch was extracted from jackfruit seed and the anthocyanins from the midnight grapes (a variety of black grapes) skin. The films were elaborated by the casting technique using different concentrations of starch and anthocyanins. Afterwards, they were characterized by analysis of thickness, solubility, water vapor permeability and by tensile tests. In addition, both the starch and the biodegradable film were characterized by Fourier-transform infrared spectroscopy (FT-IR) and by thermal analysis. The color changing ability of the films was confirmed by colorimetric changes after being used as packaging in fish (tilapia) and shrimp, suggesting the possible use of these materials as indicators of pH change.