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Solid state NMR characterization of zeolite beta based drug formulations containing Ag and sulfadiazine

机译:含Ag和磺胺嘧啶的基于β沸石的药物配方的固态NMR表征

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In this study we present a detailed characterization of zeolite beta-based drug formulations with antibacterial properties, containing Ag and sulfadiazine (SD). Solid state NMR spectroscopy (H-1, C-13, Si-29, Al-27 and H-1-Si-29 CP-HETCOR experiments) was applied to address some important questions concerning the changes in zeolite structure as a result of the simultaneous presence of both drugs SD and silver sulfadiazine (AgSD). A mechanism for transformation of octahedral defect framework Al sites and encapsulation of the extraframework Al (EFAl) present in the parent beta material into framework tetrahedral species as a result of the drug loading procedure is proposed. The analysis of H-1 spectra suggested that an ion exchange process between the zeolite protons and Ag ions occurred upon the solid-state procedure of silver introduction by AgNO3 or AgSD. Suggestions about the location of the drug molecules inside the pores and/or on the crystallite surface are made and the nature of the drug-carrier interactions is discussed. Comparison of H-1 spin-lattice (T-1) and spin-spin (T-2) relaxation times of pure drugs and drug loaded formulations indicate amorphization of the drug incorporated into the zeolite pores.
机译:在这项研究中,我们介绍了含有银和磺胺嘧啶(SD)的具有抗菌特性的基于β沸石的药物制剂的详细表征。固态NMR光谱法(H-1,C-13,Si-29,Al-27和H-1-Si-29 CP-HETCOR实验)被用于解决一些重要的问题,这些问题涉及沸石结构的变化。药物SD和磺胺嘧啶银(AgSD)同时存在。提出了一种八面体缺陷构架A1位点转变和由于药物加载过程而将母体β材料中存在的构架外Al(EFA1)封装成构架四面体物种的机制。对H-1光谱的分析表明,在通过AgNO3或AgSD固态引入银的过程中,沸石质子与Ag离子之间发生了离子交换过程。提出了关于药物分子在孔内和/或在微晶表面上的位置的建议,并讨论了药物-载体相互作用的性质。纯药物和载药制剂的H-1自旋晶格(T-1)和自旋自旋(T-2)弛豫时间的比较表明,掺入沸石孔中的药物会发生非晶化。

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