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| Fresh Preservation Effect of Silver-carried Chitosan Coated Paper on Cherry Tomato |
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| DOI：10.11980/j.issn.0254-508X.2016.07.006 |
| Key Words:chitosan silver coated paper fresh preservation cherry tomato |
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| Abstract:Silver-carried chitosan(CS) coatings were prepared by using chitosan (CS) and AgNO3 as raw materials and sodium borohydride (NaBH4) as reductant and used to prepared the coated paper. The structure, morphology and elemental composition of Ag-CS complex were analyzed with FT-IR, XRD, SEM and XPS. Cherry tomatoes were packaged with the coated paper. Fresh preservation effect of coated paper was studied. Weight loss rate, titratable acid and Vc content of the cherry tomato at different manner of package were measured. The results showed that at first coordination reactions took place between —NH2 and —OH containing in CS and Ag+. And then Ag+was reduced to the complexes of nano silver and chitosan, i.e. silver-carried chitosan.The crystallinity of CS decreased obviously. SEM confirmed that the film of silver-carried chitosan coatings was formed on the paper surface.After 10 days, weight loss rate, content decreases of titratable acid and Vc were 5.87%, 23.29% and 13.62%, respectively. Compared with the control samples, Ag-CS coated paper could reduce the loss of nutrients, thus the storage time of fruits and vegetables could be extended. |
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