均质条件对明胶乳液膜物理性能及控释性的影响

Effect of Homogenization on Physical and Controlled Release Properties of Gelatin Emulsion Films

针对蛋白膜材料机械性能和水汽阻隔性能较差的问题,采用微射流乳化的方法制备了新型橄榄油/明胶乳液膜材料,分析了均质条件对成膜乳液粒径分布和乳液膜物理性能的影响,并探讨了膜材料中油滴分布与膜材料的机械性能和水汽阻隔性之间的关联性,以及膜材料对溶菌酶的控释性.结果表明:高速分散处理的成膜乳液的油滴粒径较大且分布不均,成膜过程中部分油相富集在膜表面形成类似双层结构,膜材料机械性能较差;而经过微射流处理可以获得纳米尺度的粒子集中分布的成膜乳液,膜材料中油相均匀分散,具有良好的的抗拉强度;与对照膜相比,两种处理方法制备的乳液膜均有着较强的水汽阻隔性,但对于不同均质处理呈现不同的机制;利用微射流处理制备的膜材料具有良好的机械性能和水汽阻隔性,并对溶菌酶良好的控释性.

Protein-based films are of poor mechanical and water vapor-barrier properties. In order to solve this problem, a novel gelatin-olive oil emulsion film was prepared via the microfluidic emulsification technique. Then, the effects of homogenization on the particle size distributions of emulsions and the physical properties of the films were analyzed, and the correlations between the lipid droplet distributions and the mechanical as well as water vapor-barrier properties of the films were discussed. In addition, the controlled release properties of the films to lyso- zyme were also investigated. The results show that （ 1 ） when the emulsion is dispersed at a high rate, the lipid droplet is of large and unevenly-distributed particle size, and the corresponding film is of poor mechanical property, with a hi-layer-liked protein-lipid structure occurring during the forming of the film due to the enrichment of partial oil phase on the film surface; （2） when the emulsion is treated by means of microfluidization, it is in nano-scale with a concentrated particle distribution, and the corresponding film is of evenly-distributed oil phase and excellent tensile strength; （3） as compared with the control, the emulsion films obtained through the two above-mentioned homogenization techniques both have better water vapour-barrier property, although the corresponding mechanisms are different; and （4）the film prepared through microfluidization possesses excellent mechanical and water vapor- barrier properties as well as good controlled release ability to lysozyme.