Lignin is a source of phenolic compounds. It can be an excellent raw material for the production of films with whey protein isolate (WPI). The present study investigates WPI films with lignin microparticles (LMP). The structural, morphological, physical (thermal and mechanical analysis, water vapor barrier, color parameters, and transparency) properties, and the antioxidant properties were determined. The concentration of LMP were 0, 0.25, 0.50, and 0.75% (w/w). Structural analysis showed the addition of LMP to WPI‐based films did not change the film structure. A good dispersion of the microparticles is observed for the treatments containing 0.25 and 0.50% (w/w) LMP. In the concentrations of WPI and LMP used, an improvement in the thermal (increase of 13.46°C in Tg) and mechanical properties (35% more resistant) were observed, as well as higher temperatures of degradation and lower water vapor barrier (12 and 16% for 0.25 and 0.50%, w/w, LMP). The films containing LMP showed antioxidant potential, with higher values for 0.75% (w/w) of LMP.Practical ApplicationsThe Whey Protein Isolate is by‐product of the cheese industry and Lignin is a by‐product of the cellulose, paper, and ethanol biorefineries. The lignin improved the resistance of packaging to handling, providing longer use time for the packaging. These two polymers combined interesting characteristics for the development of new active packaging, with antioxidant action, capable of reducing food degradation and expanding the shelf life of foods.
This study aimed to evaluate the antioxidant activity of whey protein isolate (WPI) films containing different lignin microparticle (LMP) concentrations (0, 0.25, 0.50 and 0.75% w/w) during 4 days of storage at 4°C. The antioxidant activity was determined, and the effect of the active films on the prevention of oxidation in ground meat (Biceps femoris) was investigated by the identification of volatile compounds through gas chromatography coupled to a mass spectrometer (GC–MS), thiobarbituric acid reactive substance (TBARS) values, myoglobin redox forms and instrumental colour. An increase in the antioxidant activity was observed for the films as a function of the LMP concentration. A reduction of TBARS values was observed for the treatments with LMP. No significant differences were observed for the myoglobin redox forms. The use of 0.50% w/w of LMP in WPI‐based films can provide antioxidant properties to the material under the conditions studied, allowing its use for controlling the lipid oxidation in ground meat.
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