来自Bacillus subtilis的银纳米颗粒合成及其对抗抗甲素耐药黄金葡萄球菌 (Staphylococcus aureus) 的ROS介导的树脂杀菌活性
Minakshi Sinha1, Hemlata Kumari1, Shaurya Prakash1
1Department of Biochemistry, Central University of Haryana, Mahendergarh, India.
Journal of basic microbiology
|August 8, 2025
概括
绿色合成的银纳米粒子 (AgNPs) 对MRSA等耐药细菌表现出强大的抗菌活性. 这些AgNP降低了细菌的易感性,并抑制了生物膜的形成,为打击抗微生物耐药性 (AMR) 提供了一个有前途的途径.
科学领域:
- 纳米技术纳米技术
- 微生物学 微生物学
- 材料科学 材料科学 材料科学
背景情况:
- 包括MRSA和VRSA在内的金色葡萄球菌的抗菌素耐药性 (AMR) 构成了全球严重的健康威胁,使临床环境中的治疗复杂化.
- 耐药性感染的增加,特别是在中等收入国家,由高住院率和不当使用抗生素加剧,导致发病率和死亡率增加.
- 纳米技术为对抗急性和慢性微生物感染提供了创新解决方案,其中银纳米粒子 (AgNPs) 特别有前途.
研究的目的:
- 用一种绿色化学方法与Bacillus subtilis无细胞提取物合成银纳米粒子 (AgNPs).
- 用各种光谱和成像技术来描述合成的AgNP.
- 评估AgNP对抗多药耐药性病原体的抗微生物疗效,包括对甲基西林耐药黄金葡萄球菌 (MRSA).
主要方法:
- 使用Bacillus subtilis无细胞提取物进行AgNP的绿色合成.
- 通过UV-VIS,FT-IR,SEM,TEM,泽塔电位,XRD和EDX分析对AgNP进行表征.
- 对包括MRSA在内的グラム阴性和グラム阳性细菌进行抗微生物疗效测试,确定最小抑制度 (MIC),并通过ROS产生,宏分子泄漏和生物膜抑制评估杀菌效应.
主要成果:
- 鉴定证实了AgNPs.的成功合成.
- AgNPs显示出对MRSA具有显著的抗微生物效力,最小抑制度 (MIC) 为0.4 mg/mL,并且对其他测试的病原体有效.
- 通过诱导活性氧物种 (ROS) 生产和宏分子泄漏,AgNPs表现出杀菌作用,并且在1.6 mg/mL度下有效抑制了高达82%的生物膜形成.
结论:
- 绿色合成的AgNP对广泛的细菌病原体具有强大的抗菌活性,包括MRSA等耐药菌株.
- 抗菌机制涉及通过ROS生成增加细胞敏感性,并促进DNA和蛋白质泄漏.
- AgNP有效地抑制了细菌生物膜的形成,突出了它们对抗Staphylococcus aureus感染中抗菌素耐药性日益增长的挑战的潜力.
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