柠檬醛纳米胶囊的制备及其稳定性研究

Preparation of citral nanocapsules and study on its aroma stability

以明胶、阿拉伯胶为壁材,司班60(S-60)、吐温20(T-20)为乳化剂,制备柠檬醛纳米胶囊。采用高压乳匀法,通过正交试验设计优化柠檬醛纳米胶囊的制备。采用动态光散粒径仪对其性能进行检测,利用顶空固相微萃取气质联用对柠檬醛主要降解产物进行研究。结果表明,壁材总量0.4%(明胶∶阿拉伯胶为1∶1),乳化剂总量0.4%(S-60∶T-20为2∶3),pH为3.8的缓冲液(1mol/L柠檬酸和1mol/L柠檬酸钠),柠檬醛0.1%,经120MPa压力均质3次。所制备得到的柠檬醛纳米胶囊体系稳定,平均粒径为228.4nm±7nm,柠檬醛纳米胶囊储藏6d(45℃)后柠檬醛剩余量为54.4%±0.2%。

Citral nanocapsules were formulated through high pressure homogenization processes, gelatin, arabic gum as the material of wall, and mixed with emulsifiers of Span60 （S-60） and Tween20（T- 20）. The formulation and the preparation conditions were optimized by orthogonal experiments, and the research studied for the average size of nanocapsule, the change rule of citral, and the citral main degradation products, etc. The change rule of citral was inspected by using headspace solid-phase microextraction and gas chromatography （HS--SPME--GC）. The results showed that the best formulation were 0. 2% gelatin, 0. 2% arabic gum, 0. 16% Span60, 0. 24% Tween60, buffer pH 3.8（1 mol/L citric acid and 1 mol/L citric acid sodium） and homogenization 3 times. The mean diameter of citral nanocapsules were 228.4 nm±7 nm. The citrai surplus quantity in the citral nanoeapsules which stored in the 45 ℃ by 6 clays was 54.4%±0.2%.