Effect of Plasticizers on the Preservation of Blueberries by Quaternary Ammonium Salt of Chitosan Coating
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Abstract:
In order to search the plasticizers to increase the preservation effects of quaternary ammonium salt of chitosan (HTCC) coating on blueberries, 2% glycerol, sorbitol and polyethylene glycol-6000 (PEG) were added to HTCC coating, respectively. The weight loss rate, hardness, Vc content, respiratory intensity and anthocyanin content of blueberries were detected. The results showed that the coating added with glycerol could increase the weight loss and reduce the hardness of blueberries obviously and had significant difference with other groups (p<0.05). Therefore, 2% glycerol was not suitable for adding to HTCC coating. The coating added with could reduce the weight loss and respiratory intensity of blueberries, and delay the changes of anthocyanin and total soluble solid (TSS), and had significant difference with other groups (p<0.05). At 8 d, the weight loss and respiration intensity of blueberries in the group of sorbitol addition were 80.71% and 80.16%, respectively of the ones of the group processing with the coating adding with PEG , and 81.25% and 75.47% respectively of the ones of CK. Therefore, 2% sorbitol can improve the preservation effect of HTCC, which is conducive to prolonging the shelf life of blueberries.