2，4-D在明胶／壳聚糖微球中的包埋与释放

以明胶／壳聚糖复合物为水相，液体石蜡为连续油相，农药2，4-二氯苯氧乙酸（2，4-D）为芯材，Span80为乳化剂，通过醛交联，采用反相乳液法制备了2，4-D-明胶／壳聚糖微球．考察了制备条件对微球形貌及包封率的影响，并研究了2，4-D在微球中的释放性能．结果表明：当Span80为1mL，油水比为4：1，用一定量甲醛与戊二醛的混合物为交联剂，芯壁材比大于1：14时，制备的微球形态圆整，表面光滑，分散性较好．该复合微球中2，4-D的包封率为70．8％，具有良好的缓释性能，作为一种新型农药剂型可望在农业领域得到应用．

2,4-D Embedded in and Release from Gelatin/Chitosan Microsphere

2,4-D-Gelatin/chitosan microspheres were prepared using inversed phase emulsion with dehyde crosslinking. Gelatin/chitosan complexes and liquid paraffin were used as aqueous phase and oil phase, respectively. Pesticide 2,4-dichlorphenoxyacetic acid （2,4-D） was used as core material and Span80 was used as emulsifier. The influence of preparing conditions on the structure and the entrapment efficteney of the microspheres were investigated, as well as the releasing characteristics of 2,4- D from the microspheres. The results indicated that when the dose of emulsifier Span80 was 0. lmL and the mass ratio of oil phase to water phase was 4 ： 1 with formaldehyde and glutaraldehyde complex as crosslinking agent the pesticide microspheres, which had good dispersion and smooth surfaces with spherical geometry could be prepared. At the same time the entrapment efficiency of 2,4-D was 70.8%. The complex microspheres with a good controlled-release properties to 2,4-D may be applied in the agriculture field as a new pesticide formulation.