Colloids Surf B Biointerfaces:氧化石墨烯是如何发挥抗感染能力的?

2019-09-08 不详 网络

氧化石墨烯(GO)的抗菌性质引起了人们对医学领域的广泛兴趣。虽然GO对细菌的抗菌活性已得到很好的研究,但仍然缺乏对GO作用机制的更深入理解。本研究旨在阐明GO与革兰氏阳性和革兰氏阴性细菌相互作用的差异。通过紫外-可见光谱(UV-vis),拉曼和衰减全反射-傅里叶变换红外光谱(ATR-FTIR)表征合成的GO。进行活力,时间杀灭和乳糖脱氢酶(LDH)释放测定以及GO处理的细菌细胞的FESEM,TEM

氧化石墨烯(GO)的抗菌性质引起了人们对医学领域的广泛兴趣。虽然GO对细菌的抗菌活性已得到很好的研究,但仍然缺乏对GO作用机制的更深入理解。本研究旨在阐明GO与革兰氏阳性和革兰氏阴性细菌相互作用的差异。

通过紫外-可见光谱(UV-vis),拉曼和衰减全反射-傅里叶变换红外光谱(ATR-FTIR)表征合成的GO。进行活力,时间杀灭和乳糖脱氢酶(LDH)释放测定以及GO处理的细菌细胞的FESEM,TEM和ATR-FTIR分析。

检测结果显示合成GO完成了石墨烯向GO的转变,GO的抗菌活性呈浓度和时间依赖性的。随着GO浓度的增加,细菌中膜完整性的丧失增强,这相当于反应介质中LDH的升高释放。 GO处理的细菌培养物的表面形态显示GO对革兰氏阳性和革兰氏阴性细菌的作用机制的明显差异,革兰氏阳性金黄色葡萄球菌和粪肠球菌主要发生细胞内陷,而对于革兰氏阴性大肠杆菌和铜绿假单胞菌则会出现由于物理接触导致的膜破裂。与未处理的细菌细胞相比,GO处理的细菌细胞的ATR-FTIR表征显示蛋白质,肽和氨基酸区域的脂肪酸,酰胺I和酰胺II的变化。

因此,本研究结果进一步增强了我们对GO对细菌的抗菌活性的理解。

原始出处:

Pulingam T, Thong KL, et al., Graphene oxide exhibits differential mechanistic action towards Gram-positive and Gram-negative bacteria. Colloids Surf B Biointerfaces. 2019 Sep 1;181:6-15. doi: 10.1016/j.colsurfb.2019.05.023. Epub 2019 May 11.

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    2020-02-08 shanyongle
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    2020-05-03 waiwai3030
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    2020-07-28 sunylz
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