The immunoprotective effect of ACA microcapsule is better than that of APA one.The effective analgesic time of ACA-BCC is longer than that of APA-BCC.

• 结论移植到小鼠腹腔中的ACA微囊化的牛嗜铬细胞可以起到镇痛作用，其有效镇痛时间较APA微囊化的牛嗜铬细胞长。