Fig 1.
The process of KGM composite film preparation.
Table 1.
Composition and quality fraction of membrane fluid.
Table 2.
Design factor range and levels (coded).
Fig 2.
Ascorbic acid standard curve.
Table 3.
Effect of different essential oils on weight loss ratio of tomatoes.
Table 4.
Effect of different essential oils on tomatoes hardness.
Table 5.
Effect of three optimal essential oil concentrations on weight loss ratio of tomatoes.
Table 6.
Comparative effects of three optimal essential oil concentrations on tomatoes hardness.
Fig 3.
(a) The effect of KGM concentration on the weight loss ratio; (b) The effect of KGM concentration on the hardness; (c) The effect of soaking time on the weight loss ratio; (d) The effect of soaking time on the hardness.
Table 7.
Box-Behnken experimental design portfolio.
Table 8.
Variance analysis results of regression model for weight loss ratio.
Table 9.
Reliability analysis of the model.
Fig 4.
Response surface/contour plot of each interactive factor to tomatoes weight loss ratio.
Table 10.
Results of variance analysis of hardness regression model.
Table 11.
Reliability analysis of the model.
Fig 5.
Response surface/contour plot of each interactive factor to tomatoes hardness.
Table 12.
Mechanical properties, thickness, water vapor permeability, and water solubility of composite and pure KGM films.
Fig 6.
Note: (a) and (b) represent the surface microstructure images of single film and composite film, respectively, while (c) and (d) represent the cross-sectional microstructure images of single film and composite film, respectively.
Fig 7.
Infrared Spectra of KGM Composite Film.
Fig 8.
(a) Effect of KGM composite film coating preservative on weight loss ratio of tomatoes; (b) Effect of KGM composite film coating preservative on the hardness of tomatoes; (c) Effect of KGM composite film coating preservative on TSS content of tomatoes; (d) Effect of KGM composite film coating preservative on Vc content of tomatoes; (e) Effect of KGM composite film coating preservative on POD activity of tomatoes; (f) Effect of KGM composite film coating preservative on MDA content of tomatoes.
Scheme 1.
The reaction mechanism of KGM composite coating during different stages of tomatoes preservation.