以玉米淀粉为原料，采用酸解、辛烯基琥珀酸酐( OSA) 疏水改性和冷冻粉碎复合改性方法制备小颗粒淀粉，研究了酸解时间对小颗粒淀粉及稳定Pickering 乳液的影响．利用扫描电子显微镜和粒径分析仪对小颗粒淀粉的形态与粒径分布进行表征，探究了小颗粒淀粉在Pickering 乳液中的应用． 结果表明: 随着酸解时间延长，小颗粒淀粉颗粒粒径明显降低，其体积平均粒径由原淀粉的15. 6 μm 降低到6. 6 μm; 颗粒呈碎片状，且分散均匀; OSA 改性取代度随酸解时间延长而降低; 以小颗粒淀粉为乳化剂制备Pickering 乳液，乳液稳定性随着颗粒粒径的减小而增加; 乳化指数随着乳液贮存时间的延长而降低，并趋于稳定; 酸解48 h 和72 h 复合改性小颗粒淀粉制备的乳液稳定性较好，贮存30 天后乳化指数保持在60%．

In this paper,firstly,by using maize starch as a raw material,small-particle starch granules were prepared by means of acid hydrolysis,octenyl-succinic anhydride ( OSA) modification and freeze-grinding.Then,the effects of acid hydrolysis time on the properties of small-particle starch and the stability of Pickering emulsion were investigated.Finally,the morphology and particle size distribution of the prepared small-particle starch were characterized by using a scanning electron microscopy and a particle size analyzer,and the application of the smallparticle starch to Pickering emulsion was investigated.The results show that ( 1) with the prolonging of hydrolysis time,the particle size of starch granules decreases significantly,and the volume average particle size reduces from 15. 6μm to 6. 6μm; ( 2) the prepared starch granules are fragmented and disperse evenly; ( 3) the degree of substitution of OSA modified starch decreases as acid hydrolysis time prolongs; ( 4) the prepared Pickering emulsion,which uses the small-particle starch as the emulsifier,possesses a stability increasing with the decrease of particle size; ( 5) the emulsifying index of Pickering emulsion decreases with the prolonging of storage time and stabilizes in the end; and ( 6) the Pickering emulsion prepared with the starch after an acid hydrolysis for 48 h or 72 h possesses good stability,for instance,the emulsifying index achieves 60% even after a storage for 30 d.