Effect of chitosan-potassium sorbate compound liquid film coating on preservation of fresh wolfberry

Research on the effect of different chitosan compound fluid films on preservation of fresh wolfberry was carried out.The hardness, electrical conductivity, soluble solids content, PPO and POD enzyme activity, V_C content of fresh wolfberry were detected once a day at normal temperature of 25 ℃ to select the best chitosan compound liquid.The results showed that 1.0%chitosan and 0.1% potassium sorbate mixed with acetic acid of p H4.0 had the best preservation effect.The fresh wolfberry could be preserved for 7 days at normal temperature of 25 ℃ and the cell permeability, hardness, electrical conductivity, soluble solids content and V_C content could be kept well. The fruit senescence was put off and storage period of fresh wolfberry was extended.