Controlled Release of 5-Aminosalicylic Acid (5-ASA) from New Biodegradable Polyurethanes
作者:El-Refaie Kenawy、Salem S. Al-Deyab、Mohamed H. El-Newehy
DOI:10.3390/molecules15042257
日期:——
Segmented polyurethanes containing azo aromatic groups in the main chain were synthesized by reaction of 3,3'-azobis(6-hydroxybenzoic acid) (ABHB), 5-[4-(hydroxyphenyl)azo] salicylic acid (HPAS), and 5-[1-hydroxynaphthyl)azo] salicylic acid (HNAS) with hexamethylenediisocyanate (HDI). All synthesized monomers and polymers were characterized by elemental analysis, FTIR, 1H-NMR spectra, TGA and DSC analysis. All the synthesized azo polymers showed good thermal stability and the onset decomposition temperature of all these polymers was found to be above 195 ºC under nitrogen atmosphere.The release of 5-ASA under physiological conditions (pH = 7.8 and pH = 1.5) was investigated at body temperature (37 ºC). The release rate of 5-ASA increased with increasing pH (i.e., 7.8 > 1.5).
含偶氮芳香基团的主链分段聚氨酯通过3,3'-偶氮双(6-羟基苯甲酸)(ABHB)、5-[4-(羟苯基)偶氮]水杨酸(HPAS)和5-[1-羟基萘基)偶氮]水杨酸(HNAS)与六亚甲基二异氰酸酯(HDI)的反应合成。所有合成的单体和聚合物均通过元素分析、傅里叶变换红外光谱(FTIR)、核磁共振氢谱(1H-NMR)、热重分析(TGA)和差示扫描量热法(DSC)进行表征。所有合成的偶氮聚合物均表现出良好的热稳定性,在氮气环境下,这些聚合物的起始分解温度均高于195 ºC。在体温(37 ºC)下,研究了在生理条件(pH = 7.8 和 pH = 1.5)下5-ASA的释放情况。5-ASA的释放速率随pH的增加而增加(即7.8 > 1.5)。