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Enhancement of Magnetic Hyperthermia by Mixing Synthetic Inorganic and Biomimetic Magnetic Nanoparticles

机译:通过混合合成的无机和仿生磁性纳米粒子增强磁热疗。

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摘要

In this work we report on the synthesis and characterization of magnetic nanoparticles of two distinct origins, one inorganic (MNPs) and the other biomimetic (BMNPs), the latter based on a process of bacterial synthesis. Each of these two kinds of particles has its own advantages when used separately with biomedical purposes. Thus, BMNPs present an isoelectric point below neutrality (around pH 4.4), while MNPs show a zero-zeta potential at pH 7, and appear to be excellent agents for magnetic hyperthermia. This means that the biomimetic particles are better suited to be loaded with drug molecules positively charged at neutral pH (notably, doxorubicin, for instance) and releasing it at the acidic tumor environment. In turn, MNPs may provide their transport capabilities under a magnetic field. In this study it is proposed to use a mixture of both kinds of particles at two different concentrations, trying to get the best from each of them. We study which mixture performs better from different points of view, like stability and magnetic hyperthermia response, while keeping suitable drug transport capabilities. This composite system is proposed as a close to ideal drug vehicle with added enhanced hyperthermia response.
机译:在这项工作中,我们报告了两种不同来源的磁性纳米粒子的合成和表征,一种是无机的(MNPs),另一种是仿生的(BMNPs),后者是基于细菌合成过程的。当与生物医学目的分开使用时,这两种颗粒中的每一种都有自己的优势。因此,BMNPs的等电点低于中性(约pH 4.4),而MNPs在pH值为7时零ζ电位,对于磁热疗法似乎是极好的试剂。这意味着仿生颗粒更适合装载在中性pH下带正电的药物分子(例如,阿霉素),并在酸性肿瘤环境中释放。反过来,MNP可以在磁场下提供其传输能力。在这项研究中,建议使用两种浓度不同的两种颗粒的混合物,以试图从每种颗粒中获得最佳效果。我们从不同的角度研究哪种混合物表现更好,例如稳定性和磁热疗反应,同时保持合适的药物转运能力。该复合系统被提议为具有增加的高热反应的接近理想药物载体。

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