The present invention provides a water-soluble modified HA practically used as a drug carrier and a production method thereof. The present invention provides: a water-soluble modified hyaluronic acid, the residence time in blood of which is elongated to a practical level, which is produced by introducing a substituent into the carboxy group of the glucuronic acid of hyaluronic acid or a derivative thereof, via an amide bond, at a lower limit of an introduction rate of 5 mole % or more, using a BOP condensing agent in an aprotic polar solvent; and a production method thereof. Moreover, by cross-linking the modified hyaluronic acid, the present invention provides a hyaluronic acid gel capable of extremely long drug sustained-release even at the same cross-linking functional group introduction rate as that of the conventionally known gel.
本发明提供一种
水溶性的改性透明质酸,可实际用作药物载体及其生产方法。本发明提供一种
水溶性的改性透明质酸,其在血液中的停留时间延长到实际
水平,通过在无极性极性溶剂中使用BOP
缩合剂,将取代基通过酰胺键引入到透明质酸或其衍
生物的
葡萄糖醛酸羧基中,引入速率的下限为5摩尔%或更高,并提供其生产方法。此外,通过交联改性透明质酸,本发明提供一种透明质酸凝胶,即使交联功能团引入速率与传统已知凝胶相同,也能实现极长时间的药物持续释放。