两相剪切流法制备玉米胚芽油微胶囊的研究

Preparation of Corn Germ Oil Microcapsules Based on Two-phase Shear Flow

摘要:

基于气液两相剪切流，提出了一种结构简单、成本低、控制方便的微胶囊制备方法，设计了基于冷热加工工艺的玻璃微喷嘴为核心器件的微胶囊制备系统。研究了微胶囊制备工艺参数和芯、壁材配方对微胶囊有效直径Deff的影响规律，利用混合正交实验确定了最优的系统微胶囊制备工艺参数，并在最优的微胶囊制备工艺参数条件下确定了微胶囊芯、壁材的最佳配方。试验结果表明：表征微胶囊制备系统稳定性的液体含量l变化平缓，变异系数Cv<6.38%，系统具有较好的稳定性；在最优的微胶囊制备工艺参数和芯、壁材配方条件下即微喷嘴直径1000 μm、微喷嘴不含平行端部、喷射压力0.04 MPa、海藻酸钠浓度1%、氯化钙浓度1%、壁材与芯材的比值为2:1时微胶囊的包埋率可达56.44%；干燥后玉米胚芽油微胶囊微观结构较规则，表面致密，可以有效完成对玉米胚芽油的包埋。

Abstract:

A new method forpreparing microcapsules was proposed based on the shear flow of the gas-liquid two phase.An atomization system was designed, in which the micro-nozzle was the core device. The influence law caused by the preparation process parameters and the formula were studied. The optimum preparation process parameters and the optimum formula were determined through orthogonal experiments. Experiments showed that, the content of liquid changed smoothly and the relative standard deviation Cv was smaller than 6.38%, and the atomization system showed high stability. The optimum conditions were determined as follows: diameter of the micro-nozzle 1000 μm,spray pressure 0.04 MPa, alginate concentration 1%, CaCl2 concentration 1%, ratio of the wall material to the core material 1:2 and micro-nozzle without parallel ends, under which the embedding rate could reach 56.44%. The corn germ oil microcapsules had good microstructure and dense surface, which may prolong the storage stage of the corn germ oil.