Properties and Application of Multifunctional Composite Polypropylene-Based Films Incorporating a Combination of BHT, BHA and Sorbic Acid in Extending Donut Shelf-Life

Abstract

To extend the shelf-life of packaged donut without the addition of preservative, polypropylene-based active composite films loaded with a combination of sorbic acid, BHA and BHT were prepared by the extrusion moulding method: T1 (Control-pure PP-film), T2 (PP-BHT1%-SA2%), T3 (PP-BHA3%-SA2%) and T4 (PP-BHT1%-BHA1%-SA2%). The incorporation of active additives enhanced water vapour permeability (WVP) and increased oxygen permeability of films. Active films had higher antioxidant activity than pure PP in the order T4 > T2 > T3 (89.11, 83.40 and 79.16%). In vitro examinations demonstrated a significant antibacterial effect on Escherichia coli and S. aureus growth. Overall migration was not significantly different for watery food simulants, while in acidic and fatty foods increased it significantly. The effect of the active films on the fried and packaged donut samples showed significantly higher moisture contents and peroxide values, while acidity was lower. T2 film is proposed due to the preservation of the intrinsic properties of the film, increasing the storage period up to 25 to 50 days.

Active Polypropylene-Based Films Incorporating Combined Antioxidants and Antimicrobials: Preparation and Characterization

“…Also, FTIR analysis revealed the characteristic peaks for BHA ( Figure 3 B) at wavenumbers (cm −1 ) of 3395 (O–H bound stretching), 2952 (C‒H stretching), 1506 (phenyl ring), 414 (bending of –CH 2 adjacent to the phenyl), 1365 (bending of –CH 2 adjacent to the phenyl) and 1033 (C‒O bond stretching), and 815, 765, and 679 (bending of C=C out of plane phenol ring) [ 62 , 63 , 64 , 65 ]. Sorbic acid ( Figure 3 C) showed absorption peaks at wavenumbers (cm −1 ) of 2963 to 2560 (O–H bond stretching modes in a carboxylic acid), 1690 (C=O stretching), 1630 (C=C stretching), 1421 (C–C stretching), 1322 (C–O stretching), 1262 (–CH 3 rocking vibration), 1000 and 924 (C–C stretching), and 695 to 462 (C=C bending) [ 40 ].…”

“…Different physico-mechanical, thermal, structural, antioxidant/antimicrobial and migration properties of the obtained films were investigated. For this study, the composite films were separately prepared by combination of antioxidant and antimicrobial additives (as shown in Table 1 ) according to the procedure reported previously [ 40 ].…”

“…Escherichia coli (ATCC 25922), Staphylococcus aureus (ATCC 29523) and Aspergillus niger (ATCC 9029) were selected to assess the in-vitro antimicrobial activity of PP-based composite films according to the procedure explained in details earlier [ 40 ].…”

“…Distilled water, acetic acid in water (3% v / v ) and ethanol in water were (95% v / v ) considered as food simulants for aqueous foods (pH > 4.5), acidic foods (pH < 4.5), and fatty foods, respectively. Details of migration test was previously reported [ 40 ].…”

Effect of polyethylene terephthalate incorporated with titanium dioxide and zinc oxide nanoparticles on shelf‐life extension of mayonnaise sauce

“…Also, incorporating a combination of antioxidant and antimicrobial substances in food packaging is an emerging packaging system that extends the shelf-life of foods (Fasihnia et al, 2020). The LDPE films prepared with combination of Ag, ZnO, and CuO nanoparticles improved mechanical and antibacterial properties (Dehghani et al, 2019).…”