Caracterização e avaliação das propriedades antioxidantes defilmes biodegradáveis incorporados com polpas de frutas tropicais

Abstract

This research aimed to develop and characterize flexible active packages formulated by the incorporation of pulps from tropical fruits to a polymeric matrix of manioc starch, plasticized with glycerol. The mechanical properties, the barriers and the antioxidant efficacy of these packages were evaluated during storing. The packages were produced by casting, with fixed concentrations of manioc starch (4.5%) and glycerol (1.0%), and variable concentrations of mango, acerola and seriguela pulps between 5 and 20%. The barrier properties (width, humidity, total solids, water activity and solubility) and the mechanical properties of the films were evaluated. The antioxidant action of the additives incorporated was evaluated through the storage of palm oil packed with the films containing the natural additives. Its oxidation was monitored for 40 days, under conditions of accelerated oxidation (63%UR/30ºC). The addition of fruit pulps to the films promoted an increase of the mechanical resistance. The films with the added pulps performed an antioxidant effect on the palm oil during the 40 days storage, which could be applied for the oxidation control of this product.