羧甲基壳聚糖/海藻酸钠包埋柠檬醛精油微球制备工艺优化及其性能分析

以羧甲基壳聚糖和海藻酸钠为壁材制备柠檬醛微球，考察了羧甲基壳聚糖、氯化钙和海藻酸钠浓度对柠檬醛微球包埋率的影响。采用响应面法优化柠檬醛微球包埋工艺，并进一步对其性能进行分析。研究结果表明，适量的羧甲基壳聚糖、氯化钙和海藻酸钠能较好形成柠檬醛微球；微球的优化工艺参数分别为羧甲基壳聚糖浓度3.5 g/L、氯化钙浓度4.5 g/L和海藻酸钠浓度8.5 g/L，此时包埋率值为81.79%。柠檬醛微球性能研究表明，其具有控释和抗油脂氧化性能；外观呈圆型，乳白色半透明状，表面平滑有光泽；红外光谱证实柠檬醛精油被完好包裹在微球内部。由此可见，微球化有效提高柠檬醛精油的稳定性和利用率。

Process Optimization of Preparation and Properties Analysis of Citral Oil Microsphere Embedded by Arboxymethyl Chitosan/Sodium Alginate

In this paper the microspheres of citra oil were prepared of the carboxymethyl chitosan and sodium alginate as wall materials was studied. The effects of the carboxymethyl chitosan, calcium chloride and sodium alginate on the embedding rate of citral oil were investigated. Quadratic rotary combinational design was applied to optimize the embedding process on the microspheres of citral oil. Their properties were analyzed. The results showed that the amount of carboxymethyl chitosan, calcium chloride and sodium alginate could form the microspheres of citral oil. The optimized conditions were the carboxymethyl chitosan concentration of 3.5 g/L, the calcium chloride concentration of 4.5 g/L and the sodium alginate concentration of 8.5 g/L. The encapsulation yield was 81.79%. Meanwhile, the microspheres of citral oil had the properties of controlled release and anti-lipid oxidation. They were around, milky white and translucent. Their appearance were smooth and gloss. It was confirmed that citral oil was well embedded in the microsphere by FTIR. Thus the microsphere method was effective to improve the stability and utilization of citral oil.