Abstract
To improve the film-forming ability and gas permeability of chitosan (CS), cross-linked CS was prepared via cross-linking reaction with diepoxy-poly (ethylene glycol) (PEG) and used for coating preservation of vibration damaged Nanguo pears. Results showed that the elongations at break of cross-linked CS films increased from 10.4 to 31.5 cm/100 cm with PEG insertion. Meanwhile, the carbon dioxide/oxygen (CO2/O2) perm-selective ratio increased from 3.48 to 6.02 with 37.5 g/100 mL PEG addition, which is beneficial for the formation of a low O2 and high CO2 microenvironment. Both disc diffusion assay and in vivo antimicrobial activity assay on pears revealed that the CS-PEG coating can effectively inhibit the growth of spoilage organisms. CS-PEG coated pears also have lower respiration rates and malondialdehyde content. Principal component analysis displayed that CS-PEG coating has a significant effect on hardness and sensory quality of pears. The CS-PEG coated vibration damaged pears maintained a better physical appearance and remarkable hardness for 25 days.
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