Effects of Clove and Licorice Extracts and Quaternary Ammonium Salt of Chitosan Composite Coatting on Preservation of Blueberry Fruits

In order to improve the effects of quaternary ammonium salt of chitosan(HTCC)coating on preservation of blueberries,0.5% clove and licorice extracts were respectively added to HTCC coating and blueberries were coated with the two composite coatings. The effects of the two composite coatings on the preservation of blueberries at 4 ℃ were studied. The results showed that compared with HTCC coating alone,the two composite coatings could reduce the weight loss of blueberries,decrease the degree of reducing of V_C content and hardness,delay the changes of anthocyanin,and get better preservative effect. Moreover,the preservative effect of the coating added with clove extracts was better than that with licorice extracts. Therefore,0.5% clove extracts could improve the preservative effect of HTCC coating,which was beneficial to the preservation of blueberries.