Aplicação de filmes de quitosana aditivados com extrato de resíduo agroindustrial de acerola em sobrecoxa de frango

Abstract

In last years, a great progress in packaging technology has been made trying to maximize the protection that it provides to food and minimize the environmental impact of its disposal on the planet. In this scenario, environmentally packaging friendly has been constantly improving and gaining prominence among industries, such biofilms produced from chitosan, a natural polysaccharide that could form coatings for food application, since it is a non-toxic, biodegradable material with antifungal and antimicrobial properties. The objective of this study was the development and application of active biofilms from chitosan, incorporating active antioxidant compounds obtained from the acerola agroindustrial residue. For this, an extract of acerola was produced from the residue of acerola discarded by pulp industries, giving them new purpose. Biofilms of chitosan (1% w/v) with three different extract concentrations were developed: 0,0% (G1); 1,0% (G2) and 2.5% (G3) of acerola agroindustrial residue, added to the biofilm in order to provide antioxidant characteristics. The produced biofilms were used to pack pieces of boneless poultry and together with a control group (without biofilm/GC), stored at refrigeration temperature (4±1ºC). At pre-determined time intervals, in a first step, the chicken meat was evaluated for lipid oxidation (TBARS), pH and temperature. From the results of TBARS and pH obtained, it was observed that the biofilms of pure chitosan (G1) and incorporated with 1% of extract (G2) achieved better performance. Secondary analyzes were conducted with biofilms G1, G2 and a control group (GC), which were again applied in chicken and evaluated for pH, temperature, TBARS, color, water-holding capacity (WHA), texture profile analysis (TPA) and microbiological analysis. Also, all films were evaluated for DPPH radical sequestration capacity, phenolic content and retention, where it was possible to prove their antioxidant activity. The biofilm that presented the best results was G2 (1% of extract), which even after 20 days of storage (4±1ºC) preserved the sample with low values TBARS (0,385 mgMDA.kg-1), pH of 6,25, temperature of 10.33ºC, high WHA (86.5%), firm texture and maintenance of the microbiological quality, being efficient in retarding the lipid oxidation and maintaining the quality of the product for longer.