...
首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >The Role of pH in Modulating the Electronic State Properties of Minocycline Drug and Its Inclusion within Micellar Carriers
【24h】

The Role of pH in Modulating the Electronic State Properties of Minocycline Drug and Its Inclusion within Micellar Carriers

机译:pH在调节Minocycline药物的电子态特性及其在胶束载体中的包裹性中的作用

获取原文
获取原文并翻译 | 示例
           

摘要

A detailed investigation of the spectral and photophysical properties of minocycline (MC) in water at different pHs, solvents of different polarity, and micellar surfactant solutions was carried out in this study. An unusual behavior was highlighted with respect to other tetracyclines due to the presence of an additional dimethylamino group in the MC molecular structure. In particular, four equilibrium constants associated with monodeprotonation reactions were characterized by steady-state spectroscopy. Femtosecond time resolved pump probe and fluorescence up-conversion measurements allowed the dynamics of the lowest excited singlet state of the five different acid base species of MC to be characterized in terms of lifetimes and transient spectra. Two emissive species associated with keto enol tautomerism resulting from excited-state intramolecular proton transfer (ESIPT) were revealed with time constants of a few and tens of picoseconds. TD-DFT quantum mechanical calculations were also performed to define the state order and nature of the differently protonated species, together with their absorption spectra. The role of pH proved to be fundamental in modulating the drug charge and therefore the interaction with cationic micelles where the neutral form of MC, that is the biologically active one, resulted efficiently included.
机译:在这项研究中,对米诺环素(MC)在不同pH值,不同极性的溶剂和胶束表面活性剂溶液中的光谱和光物理性质进行了详细的研究。由于在MC分子结构中存在另外的二甲基氨基,因此对于其他四环素而言,突出了一种不寻常的行为。特别地,通过稳态光谱法表征了与单去质子化反应相关的四个平衡常数。飞秒时间分辨泵浦探针和荧光上转换测量,可以根据寿命和瞬态光谱来表征MC的五个不同酸碱物种的最低激发单重态的动力学。揭示了与由激发态分子内质子转移(ESIPT)引起的酮-烯醇互变异构相关的两种发射物种,其时间常数为几十皮秒。还进行了TD-DFT量子力学计算,以定义不同质子化物种的状态顺序和性质,以及它们的吸收光谱。 pH的作用被证明是调节药物电荷的基础,因此与阳离子胶束的相互作用被有效地包括在内,其中阳离子的胶束中性形式的MC即具有生物活性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号