intercalators. In contrast, Isatin binds with ctDNA via groove mode (Kb[Isatin–ctDNA] = 7.32 × 104 L mol−1) without any significant enhancement in ctDNA viscosity. The fluorescence quenching of Isatin by ctDNA was observed as static. CD spectra indicated that Isatin effectively absorbs into grooves of ctDNA, leading to transition from B to C form. Thermodynamic parameters like enthalpy changes (∆H < 0) and entropy
研究了Isatin及其衍
生物Isatin-3-isonicotinylhydrazone(IINH)和Isatin-β-thiosemicarbazone(IBT)与小牛胸腺DNA(ctDNA)的相互作用,以利用UV-Vis /荧光/圆二色性描述药物理化性质。 (CD)光谱,粘度测量和多元
化学计量学。IINH和IBT分子插入DNA的碱基对之间,UV吸收的变色,CD阳性谱带的增加,比粘度的急剧增加以及IINH和IBT与ctDNA形成的
亚甲基蓝和
中性红染料的置换。分子。观察到的固有结合常数(K b [IBT–ctDNA] = 1.03×10 5和K b[IINH–ctDNA] = 1.09×10 5 L mol -1)与其他嵌入剂大致相当。相反,Isatin通过凹槽模式(K b [Isatin–ctDNA] = 7.32×10 4 L mol -1)与ctDNA结合,而ctDNA粘度