目的 对千禧果进行涂膜包装，从而延长其常温贮藏的货架期。方法 采用壳聚糖(Chitosan, CS)和羧甲基壳聚糖(Carboxymethyl Chitosan，CMCS)为基材，利用层层自组装(Layer-by-layer Self-assembly，LBL)的方法对千禧果进行涂膜保鲜包装，研究CS与CMCS之间的作用力类型，以及涂膜处理对千禧果的保鲜效果。结果 通过红外分析可知，CS与CMCS之间依靠氢键作用和静电力相互连接;通过实验确定CMCS/CS层层自组装双层涂膜对千禧果的保鲜效果相对最佳，在室温下能将千禧果的保鲜期延长至9 d，贮藏9 d后千禧果的质量损失率、腐烂率、硬度、可溶性固形物质量分数、维生素C含量及有机酸含量分别为3.3%、6.7%、5.3 kg/cm²、7.7%、29.3 mg/hg和0.48%。结论 CS和CMCS层层自组装多层涂膜对千禧果具有明显的保鲜效果，能有效延长其货 架期。

In order to prolong the shelf life of millennial fruits at room temperature, chitosan (CS) and carboxymethyl chitosan (CMCS) are coated on millennial fruits by layer-by-layer self-assembly (LBL) technology. The types of force between CS and CMCS as well as the preservation effects on millennial fruits are studied. The FTIR results show that there are hydrogen bonding and electrostatic force between CS and CMCS. The CMCS/CS LBL double-layer coating film has the best fresh-keeping effects which can extend the shelf life of millennial fruits at room temperature to 9 days. The weight loss rate, decay rate, firmness, total soluble solid, Vc and organic acid content for millennial fruits after 9 days is 3.3%, 6.7%, 5.3 kg/cm2, 7.7%, 29.3 mg/hg and 0.48% respectively. The LBL multilayer coating films of CS and CMCS can effectively inhibit the transpiration and respiration strength of millennial fruits, thereby prolonging their shelf life.