Preparation of Antimicrobial Collagen Casings with High Mechanical Properties

Abstract

Tea Polyphenols (TP) has received much attention for their excellent antioxidant and antibacterial activities. Some additives (such as sodium alginate and sodium pyrophosphate) have good hydrophobicity which have influence on the mechanical properties of food. The effect of TP on the antibacterial activity of collagen casing was investigated, the effect of addition of TP, sodium pyrophosphate and sodium alginate on mechanical properties including tensile force, tensile strength and elongation at break were also studied. Results from the single factor experiments demonstrated that TP showed strong antibacterial activities against Escherichia coli, Staphylococcus aureus and Salmonella according to the Minimum Inhibitory Concentration (MIC) and the inhibition zone method. Moreover, the mechanical properties of collagen casings were obviously influenced by the addition of TP and two food additives including sodium alginate and sodium pyrophosphate. This work would be useful for application of collagen casings with TP in food package to extend shelf-life of sausage during processing, transportation and storage.

Preparation of Collagen Casings with High Mechanical Properties using Response Surface Methodology

“…2A and Fig. 3A, the longitudinal and transverse tensile force increased firstly and then decreased as the concentration of sodium alginate increased, which was consistent with our previous research (Xie et al, 2020). We also found that longitudinal tensile force reached the lowest value and transverse tensile force reached highest value when concentration of TP was 1.5 and 1.99%, respectively ( Fig.…”

“…In response surface experimental, RSM using BBD was employed to investigate the relationship between three independent variables (X1, concentration of sodium alginate; X2, concentration of sodium pyrophosphate; X3, concentration of TP) that was code at three levels (-1, 0, 1) and six dependent variables (Y1, longitudinal tensile force; Y2, transverse tensile force; Y3, longitudinal tensile strength; Y4, transverse tensile strength; Y5, longitudinal elongation at break; Y6, transverse elongation at break) of collagen casings in this study (Table 1). All the ranges of the parameters in RSM were selected based on the results of single factor experiments according to our previous study (Xie et al, 2020). The concentrations of sodium alginate, sodium pyrophosphate and TP varied from 2.5 to 3.5%, 2.5 to 3.5% and 1.5 to 2.5%, respectively.…”

Recent Advances in Bio-Based Smart Active Packaging Materials

“…In tests, researchers have demonstrated that the addition of antibacterial tea polyphenols to collagen casings significantly improves the mechanical properties of the casings and increases the antibacterial activity against Escherichia coli, Staphylococcus aureus, Bacillus subtilis and Salmonella [ 22 ]. Collagen can also be modified by crosslinking with other proteins that are thermally stable [ 23 ].…”