Abstract
Food packaging technology has been advancing to provide safe and high quality food products and to minimize food waste. Moreover, there is a dire need to replace plastic materials in order to reduce environmental pollution. The aim of this study was to prepare biodegradable antimicrobial packaging films from gelatin. Boric acid, disodium octaborate tetrahydrate, and sodium pentaborate were incorporated as the antimicrobial agents. Films containing boric acid and its salts showed antibacterial effect against Staphylococcus aureus and Pseudomonas aeruginosa, as well as antifungal and anticandidal effects against Aspergillus niger and Candida albicans. The mechanical strength of the films was mostly enhanced by the addition of boron derivatives. The rheological measurements and Fourier-transform infrared spectroscopy results suggest that boron derivatives did not interfere with the network formation during gelling. The morphology of boron-added antimicrobial films was found to be similar to the morphology of the control . In conclusion, the newly developed gelatin films containing 10% or 15% disodium octaborate (g/g gelatin) might be good candidates for biodegradable antimicrobial packaging materials.
Highlights
Petroleum-based plastics are commonly preferred in food packaging due to their low cost, ease of handling, various production technologies, lightweight, good barrier properties, and transparency (Shah et al, 2008; Lagaron and Lopez-Rubio, 2011)
Conductivity measurements showed that addition of boron derivatives has a similar effect on the conductivity as on pH
The results show that gelatin films containing different boron derivatives showed inhibitory effect on S. aureus, P. aeruginosa, and A. niger for all film formulations
Summary
Petroleum-based plastics are commonly preferred in food packaging due to their low cost, ease of handling, various production technologies, lightweight, good barrier properties, and transparency (Shah et al, 2008; Lagaron and Lopez-Rubio, 2011). Composed of polymers that can be degraded by microorganisms (Nur Hanani et al, 2014), biodegradable films made of proteins generally exhibit better mechanical and barrier properties than those made of polysaccharides (Cuq et al, 1998; Wang et al, 2007). An animalbased protein, has been widely used in biodegradable food packaging and edible film studies (Sobral et al, 2001; Bigi et al, 2004; Chambi and Grosso, 2006; Andreuccetti et al., 2009; Rivero et al, 2010; Nur Hanani et al, 2012a, 2014; Li et al, 2014). Gelatin forms thermoreversible gels when cooled below 30 °C
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