| To prepare the microcapsules of litchi pericap extractive and study its stability, the arabic gum and malt dextrin (3：1) were used as wall-materials, and the microcapsules were prepared by spray drying method. Several single factors such as wall-materials, the ratio of wall-materials to core, stirring temperature and time, blowing temperature and speed, feeding speed were studied by taking the encapsulation efficiency and moisture as indexes. Orthogonal experiments were carried out to gain an optimal process, which showed that the ratio of wall-materials to core was 1：5, the stirring temperature was 35℃ and time was 0.5 h, blowing temperature was 190℃ and speed was 4.3 m/s, and feeding speed was 7 r/min. Results indicated that this process was stable and reliable. Then the stability of microcapsules was studied on properties of appearance and polyphenols content, and the results showed that the microcapsules improved the stability of litchi pericarp extractive effectively under high temperatures and strong light conditions. |
