Preparação, caracterização e avaliação da eficácia de biofilmes a base de fécula de mandioca (manihot Esculenta crantz) e incorporados com polpas de manga (mangifera indica l) e de acerola (malpighia emarginata l) como aditivos antioxidantes

Abstract

With the intention of developing antioxidant natural active packages that uses a polymeric environment friendly matrix, this paper evaluates the characterization and incorporation of mango and acerola pulps as antioxidant additives for active bio-degradable packages made of cassava starch and plasticizers (sucrose and inverted sugar). Total Carotenoids, Phenol Compounds and Vitamin C extracted from mango and acerola pulps were investigated as antioxidant agents to be added in the bio-films. Palm oil´s lifetime packed in the enriched active compound bio-packages (0-17,1% m/m of mango pulp and/or 0-17,1% m/m of acerola pulp) was monitored for 45 days under accelerated oxidative conditions (63%UR/30 ºC). Palm oil packed in non added bio-films (C1), in low density polyethylene (C2) and without any package (C3) was used as controlling samples. After 45 days of storage, the palm oil packed in the most concentrated additives bio-films has presented the lowest oxidation index, and as expected, those packages presented the highest antioxidant losses, which demonstrates that, instead of the product, the packages has suffered most of the oxidation process. The pulp incorporation in the bio-films has triggered significant changes in their physical, chemical, mechanical and thermal characteristics. The permeability to water steam and the number of glazed transition temperatures were reduced when incorporated the biggest additives concentration (17,1% m/m of mango pulp and 17,1% m/m of acerola pulp) compared to the controlling samples, and has occurred an increase in the traction resistance and stretching percentage. A bio-film made of cassava starch without the additives was used as controlling sample (C). Therefore, the incorporation of mango and acerola pulps in the cassava starch bio-films has conferred a pronounced protective effect against lipid oxidation, significantly changing their physical, chemical, mechanical and thermal characteristics.