喷雾干燥法制备柠檬醛微胶囊及微胶囊稳定性研究

以甲基纤维素（MC）、羧甲基壳聚糖（CMCTS）和海藻酸钠（Alg）为复合壁材,通过层层自组装法,采用喷雾干燥法制备柠檬醛微胶囊,研究了壁材组成对微胶囊的柠檬醛含量、形态、吸水性能及稳定性的影响,以柠檬醛含量为指标确定柠檬醛微胶囊的最佳壁材组成及工艺条件为:甲基纤维素（内层）0.8g/50mLH₂O、羧甲基壳聚糖1.0g/30mLH₂O、海藻酸钠6.0g/180mLH₂O、甲基纤维素（外层）0.8g/50mLH₂O,柠檬醛含量为4.54%。添加双亲性MC作为内层壁材使柠檬醛含量提高了3.12%。以MC作为外层壁材使柠檬醛含量提高了0.23%,90d内微胶囊的吸水量降低了0.42%,提高了微胶囊在贮存过程中的稳定性。 

Preparation of citral microcapsules through spray-dring and the stability of the micorcapsules

Spray-drying and layer by layer self-assembly method were employed to prepare citral microcapsule, using methylcellulose ( MC) , carboxymethyl chitosan ( CMCTS) and sodium alginate ( Alg) as the wall materials components.The effects of wall material composition on citral content, morphology, water absorption, and stability of the citral microcapsules were investigated.The optimum wall material composition and prepare conditions were as follows: MC ( in) 0.8 g/50 m L H₂O, CMC1.0 g/30 m L H₂O, Alg 6.0 g/180 m L H₂O, MC ( out) 0.8 g/50 m L H₂O, the citral content of citral microcapsule being 4.54%.Using amphiphilic MC as the inner wall materials improved the citral content by 3.12%. Using MC as the outer wall material increased the citral content of citral by 0.23%, reduced the water absorption of microcapsules by 0.42% in 90 days and improved the stability of the microcapsules during storage.