目的 制备一种新型可降解复合保鲜膜，并探究其对鲤鱼的保鲜效果。方法 采用离子交换法合成一种新型插层水滑石-脱氢乙酸插层水滑石（MgAl-DHA-LDHs）。以果胶为主要成膜材料，甘油为增塑剂，脱氢乙酸根插层水滑石纳米材料为填充物, 合成MgAl-DHA-LDH/果胶复合保鲜膜。分别用 X 射线衍射（X-ray diffraction, XRD）、红外光谱（Fourier transform infrared spectrometer, FI-IR）分别对插层水滑石和复合保鲜膜进行表征, 并研究脱氢乙酸根插层水滑石复合物的添加量对鲤鱼保鲜效果的影响。结果 实验结果表明，脱氢乙酸根成功插入水滑石中，当MgAl-DHA-LDHs质量分数为0.2%时鲤鱼的保鲜效果最佳, 其菌落总数、硫代巴比妥酸值(TBARs)、挥发性盐基氮（TVB-N）、pH值均低于空白对照组。结论 此种复合保鲜膜对鲤鱼具有较好的保鲜效果, 可延长货架期5~6 d。

The work aims to prepare a new type of degradable composite preservative film and study its preservation effect on carp. A new type of intercalated layered double hydrotalcite--dehydroacetic acid intercalated layered double hy-drotalcite (MgAl-DHA-LDHs) was synthesized by ion exchange method. MgAl-DHA-LDHs/pectin composite film was prepared with pectin as the matrix, glycerin as the plasticizer and MgAl-DHA-LDHs as filler. The MgAl-DHA-LDHs and the composite preservative film were characterized respectively by X-ray diffraction (XRD) and Fourier transform infrared spectrometer (FI-IR). The effects of the addition of the MgAl-DHA-LDHs on the preservation effect of carp were studied. The results showed that, the dehydroacetate was successfully intercalated into LDHs. The carp was best preserved when the mass fraction of MgAl-DHA-LDHs was 0.2%. The total viable count, thiobarbituric acid value (TBARs), total volatile basic nitrogen value (TVB-N) and pH of the blank group were higher than those of each treatment group. The proposed composite preservative film has good preservation effect on carp, and it can extend the shelf life by about 5-6 d.