To provide a biodegradable hydrogel having an acetal structure whose hydrolysis rate under different pH environments in the living body can be accurately controlled. A hydrogel obtained by crosslinking a polyalkylene glycol derivative having a cyclic benzylidene acetal structure represented by formula (1) shown below with a crosslinking agent.
In formula (1), R1 and R6 are each independently a hydrogen atom or a hydrocarbon group; R2, R3, R4 and R5 are each independently an electron-withdrawing or electron-donating substituent or a hydrogen atom; s is 1 or 2, t is 0 or 1, and s + t is 1 or 2; P1 is a polyalkylene glycol having the number of terminals from 2 to 8; Z1 and Z2 are each independently a selected divalent spacer; W1 is an integer of 2 to 8 and is equal to the number of terminals of the polyalkylene glycol; and X1 is a chemically reactive functional group.
提供一种具有
缩醛结构的可
生物降解
水凝胶,其在
生物体内不同 pH 值环境下的
水解速率可得到精确控制。一种
水凝胶,由具有下式(1)所示环状亚苄基
缩醛结构的聚亚烷基二醇衍
生物与一种
交联剂交联而成。
在式 (1) 中,R1 和 R6 各自独立地为氢原子或烃基;R2、R3、R4 和 R5 各自独立地为取电子或供电子取代基或氢原子;s 为 1 或 2,t 为 0 或 1,s + t 为 1 或 2;P1 是端子数为 2 至 8 的聚亚烷基二醇;Z1 和 Z2 各自独立地是选定的二价间隔物;W1 是 2 至 8 的整数,且等于聚亚烷基二醇的端子数;以及 X1 是
化学活性官能团。