在细菌表面上聚合和相互作用的阴离子纳米粒子
Steven C Hayden1, Gengxiang Zhao, Krishnendu Saha
1School of Chemistry and Biochemistry, Georgia Institute of Technology, 910 Atlantic Drive, Atlanta, Georgia 30332, USA.
Journal of the American Chemical Society
|April 12, 2012
概括
阴性黄金纳米粒子 (AuNPs) 与格拉姆阴性和格拉姆阳性细菌的相互作用不同. 纳米颗粒大小决定了聚合模式和细菌溶解,通过蛋白质分解处理可以逆转这些模式.
科学领域:
- 纳米技术 纳米技术
- 微生物学 微生物学
- 表面化学 表面化学
背景情况:
- 金纳米粒子 (AuNPs) 越来越多地被用于生物医学应用.
- 了解纳米粒子-细胞膜相互作用对于有针对性的输送和有效性至关重要.
- 细菌细胞外在格拉姆阴性和格拉姆阳性物种之间存在显著差异.
研究的目的:
- 为了研究化单层保护黄金纳米粒子 (AuNPs) 与细菌细胞膜的尺寸依赖相互作用.
- 阐明不同大小的AuNP的独特聚合模式和对细菌活力的影响 (溶解).
- 确定细菌表面蛋白在调解这些相互作用中的作用.
主要方法:
- 阴离子AuNPs (6nm和2nm) 的合成和表征.
- 用大肠杆菌 (Gram-) 和细菌细菌 (Gram+) 化AuNP.
- 使用传输电子显微镜 (TEM) 和紫外线光谱学分析AuNP-细菌相互作用.
- 评估细菌溶解和蛋白质溶解处理的影响.
主要成果:
- 在大肠杆菌和B. subtilis上观察到明显的AuNP表面聚合模式.
- AuNP的大小影响了聚合模式和细菌溶解的程度.
- 细菌的蛋白质分解处理消除了观察到的独特的聚合模式,表明蛋白质参与.
- 较小的2nm AuNPs与6nm AuNPs相比显示出更明显的效果.
结论:
- 阴离子AuNP与细菌膜的相互作用取决于大小和特定物种.
- 细菌表面蛋白质在调解AuNP聚合和随后的细胞效应方面发挥着至关重要的作用.
- 这些发现为纳米粒子与细菌相互作用的机制提供了洞察力,这与抗菌战略有关.
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