Abstract
Abstract Corn starch/polyvinyl alcohol (PVA)/glycerol composite films incorporated with ε-polylysine were prepared, and their properties were investigated. The Fourier-transform infrared (FTIR) spectroscopy indicated that the interactions happened between the amino group of ε-polylysine and hydroxyl group starch/PVA composite films. X-ray diffraction (XRD) analysis showed that the addition of ε-polylysine decreased the intensity of all crystal peaks. Thermogravimetric (TGA) analysis suggested that ε-polylysine improved the thermal stability of composite films. Scanning electron microscopic (SEM) analysis showed that the upper surface of composite films incorporated with ε-polylysine presented more compact and flat surface. The antimicrobial activity of the composite film progressively increased with the increasing of ε-polylysine concentration (P < 0.05). The tensile strength, elongation at break and water absorption significantly increased, whereas water solubility decreased with the increasing of ε-polylysine concentration (P < 0.05). Therefore, the corn starch/PVA/glycerol composite films incorporated with ε-polylysine had good mechanical, physical and antimicrobial properties and could have potential application as a novel antimicrobial packaging material.
Highlights
IntroductionStarch, a natural, inexpensive and biodegradable polymer, has been widelyPVA is a synthetic polymer that can be biodegradable in the natural environment [2,4]
To reduce environmental pollution, starch, a natural, inexpensive and biodegradable polymer, has been widelyPVA is a synthetic polymer that can be biodegradable in the natural environment [2,4]
Corn starch/PVA/glycerol composite films incorporated with ε-polylysine were prepared, and their mechanical, physical and antimicrobial properties were investigated
Summary
Starch, a natural, inexpensive and biodegradable polymer, has been widelyPVA is a synthetic polymer that can be biodegradable in the natural environment [2,4]. The relatively high cost and the low biodegradation rate are two major restrictions while using packaging materials made of pure PVA [5] These defects can be eliminated by blending starch in pure PVA [6]. To confer the antimicrobial property, many antimicrobial substances such as sorbic acid, chlorine dioxide, nisin and pectin have been successfully incorporated in food packaging materials [13,14,15]. Among these antimicrobial substances, antimicrobial peptides that act as biological preservatives have received extensive attention due to their safety. There are some reports about the preparation of food packaging films containing ε-polylysine for controlling spoilage and pathogenic microorganisms [21,22,23]
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