Effect of Glycerol on Nano SiOx-chitosan Coating Synthesized in Situ
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Abstract:
Nano SiOx-chitosan preservation coatings were prepared by an in situ method, and the effect of glycerol dosage on their gas permeability, mechanical properties, and freshness storage properties were investigated. The coatings were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscope (SEM), and Transmission electron microscope (TEM) analyses. Meanwhile, the gas permeability, mechanical properties, freshness storage properties to the Sciaenops ocellatus when using the preservation coating were studied. The results showed that with an increase in glycerol concentration, the gas permeability and breaking elongation of the nano SiOx-chitosan coating increased but the tensile strength decreased. Upon the addition of glycerol, the coatings became smooth and the crystal structure changed. The preservation properties of the nano SiOx-chitosan coating with glycerol were obvious. However, the results of biochemical indexes and sensoryevaluation indicated that the influence of glycerol on the preservation ability was notobvious.Compared with the 0.30% glycerol, the TBA and texture changes were delayed, and the growth of the total bacteria was reduced by the coating with 0.10% glycerol effectively.
