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Morphology-dependent antimicrobial activity of Cu/CuxO nanoparticles

机译：Cu / CuxO纳米粒子的形态依赖性抗菌活性

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摘要

Cu/CuxO nanoparticles (NPs) with different morphologies have been synthesized with glucose as a reducing agent. The X-ray diffraction and Scanning electron microscopy imaging show that the Cu/CuxO NPs have fine crystalline peaks with homogeneous polyhedral, flower-like, and thumbtack-like morphologies. Their antimicrobial activities were evaluated on inactivation of Escherichia coli using a fluorescence-based live/dead staining method. Dissolution of copper ions from these NPs was determined. Results demonstrated a significant growth inhibition for these NPs with different morphologies, and the flower-like Cu/CuxO NPs were the most effective form, where more copper ions were dissolved into the culture media. Surface free energy calculations based on first-principle density functional theory show that different crystal facets of the copper NPs have diverse surface energy, indicating the highest reactivity of the flower-like NPs, which is consistent with the results from the dissolution study and antimicrobial activity test. Together, these results suggest that the difference between the surface free energy may be a cause for their morphology-dependent antimicrobial activity.
机译：以葡萄糖为还原剂合成了不同形态的Cu / CuxO纳米颗粒（NPs）。 X射线衍射和扫描电子显微镜成像表明，Cu / CuxO NP具有精细的晶体峰，具有均一的多面体，花状和图钉状形态。使用基于荧光的活/死染色方法评估大肠杆菌灭活后的抗菌活性。确定了这些NP中铜离子的溶解度。结果表明，这些形态各异的NP具有明显的生长抑制作用，而花状Cu / CuxO NP是最有效的形式，其中更多的铜离子溶解在培养基中。基于第一原理密度泛函理论的表面自由能计算表明，铜纳米颗粒的不同晶面具有不同的表面能，表明花状纳米颗粒具有最高的反应性，这与溶出度研究和抗菌活性的结果一致测试。总之，这些结果表明，表面自由能之间的差异可能是其依赖于形态的抗菌活性的原因。

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