微胶囊化硫酸亚铁的研究

Study on ferrous sulfate microencapsulation

以黄原胶、阿拉伯胶、卡拉胶3种多糖为壁材,采用冷冻干燥法对硫酸亚铁进行包埋处理,制成硫酸亚铁微胶囊。探讨和确定测定微胶囊表面铁时清洗表面铁的条件,并研究制备微胶囊时壁材的浓度、芯材与壁材的比例对微胶囊包埋效果的影响。结果确定清洗微胶囊表面铁采用50%乙醇水溶液作为溶剂,处理时间为5 min。壁材浓度对3种微胶囊的包埋率几乎无明显影响,而随着壁材/芯材比例的增加,包埋率明显增加。其中,当以5%黄原胶作壁材,壁材/芯材为301∶时,包埋率相对较高,可达97%。

Three kinds of polysaccharides, including xanthan gum, arabic gum and carrageenan, were used as coating materials to prepare ferrous sulfate microcapsules by freeze drying. The condition of washing unencapsulated iron was discussed when determining exterior iron of microcapsules, and the effect of wall material concentration, the ratio of wall material to core material on the encapsulation efficiency were studied. The results showed that washing exterior iron of microcapsule was used 50%（v/v） ethanol as solvent and washing time was 5 minutes. The wall material concentrations had no significant effect on encapsulating efficiency. And with the increase of the ratio of wall material to core material, the encapsulating efficiency of the three polysaccharides all increased significantly, especially for xanthan gum. When 5% xanthan gum was as coating material, and the ratio of coating material to core matedal was 30：1, the encapsulating efficiency was relatively higher, up to 97%.