苯甲酸根插层水滑石/果胶复合保鲜膜对草鱼保鲜效果研究

Bio-nano-hybrid coatings for grass carp preservation based on pectin and MgAl-benzoic acid-LDHs

目的改善保鲜膜的性能,拓展果胶的应用领域。方法以果胶为基质,改性后的苯甲酸根插层水滑石纳米材料为填充物,制备一种新型保鲜膜。分别用X射线衍射(X-ray diffraction,XRD)、红外光谱(Fourier transform infrared spectrometer,FI-IR)对纳米水滑石和复合保鲜膜进行表征,并探讨苯甲酸根插层水滑石复合物的添加量对草鱼保鲜效果的影响。结果 MgAl-苯甲酸根-LDHs添加量为0.05%时草鱼保鲜效果最佳,且空白组的菌落总数、硫代巴比妥酸值(thiobarbituric acid,TBA)、挥发性盐基氮(total volatile basic nitrogen,TVB-N)、pH值均高于各处理组。结论复合保鲜膜具有较好的保鲜效果,并且能延长货架期8 d左右。

Objective To improve the performance of preservative film and expand the application of pectin. Methods A new type of preservative film was prepared by using pectin as the matrix and the modified benzoic acid root intercalated into the nano MgAl-benzoic acid-LDHs as filler. The nano-LDH and the preservative film were characterized by X-ray diffraction（XRD） and Fourier transform infrared spectrometer（FI-IR）. The effects of the addition of the MgAl-benzoic acid-LDHs on the preservation of grass carp were discussed. Results The grass carp was best preserved when MgAl-benzoic acid-LDHs was added in 0.05%. The total viable count, thiobarbituric acid value（TBA）, total volatile basic nitrogen value（TVB-N） and pH of the blank group were higher than those of each treatment group. Conclusion The composite preservative film has a good preservation effect, and can extend the shelf life of about 8 d.