全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
材料工程  2008 

纳米银对大肠杆菌的抗菌作用及其机制

, PP. 106-109

Keywords: 纳米银,大肠杆菌,抗菌作用

Full-Text   Cite this paper   Add to My Lib

Abstract:

以大肠杆菌为研究对象,对纳米银的抗菌效果进行了研究,并对其抗菌机制做了初步探讨。纳米银对大肠杆菌的抑制生长曲线的结果表明,20μg/mL的纳米银能够完全抑制106cfu/mL的大肠杆菌细胞生长,纳米银使大肠杆菌的延滞期加长,并且纳米银浓度越高,延滞期越长。采用透射电镜观察了经纳米银粒子处理过的大肠杆菌细胞形态变化过程,结果显示纳米银粒子先在细胞壁上产生小的孔洞,通过这些孔洞进入周质空间,导致细胞膜成分渗漏和破坏细胞膜,进而进入细胞内部。进入细胞内部的纳米银粒子使DNA浓缩呈紧张态,并与破损细菌的细胞质结合积聚,最后引起胞内物质流失。另外,纳米银对大肠杆菌总DNA影响的分析表明,随着纳米银浓度的增高,大肠杆菌总DNA样品降解的程度增大。

References

[1]  夏金兰,王春.刘新星.抗菌剂及其抗菌机理[J].中南大学学报,2004,35(1):31-38.
[2]  杨玉旺,刘敬利.纳米银研究和应用新进展[J].工业催化,2003.11(12):7-12.
[3]  SAMBROOK J,FRITScH EF,MANISTIS T.Molecular cloning:a laboratory manual[M].3rd ed,New York:Cold Spring Harbor Laboratory Press,2001.
[4]  SONDI I,SALOPEKAI-SONDI B.Silver nanoparticles as antimicrobial agent:a case study on E.coli as a model for Gram-negative bacteria[J].Journal of Colloid and Interface Science,2004,275:177-182.
[5]  HAMOUDA T,BAKER JR.Antimicrobial mechanism of action of surfactant lipid preparations in enteric gram-negative bacilli[J].Journal of Applied Microbiology,2000,89:397-403.
[6]  刘康时,江显异,赵英.银系无机抗菌剂作用机理的研究进展[J].佛山陶瓷,2001,11(56):1-5.
[7]  BERGER TJ,SPADARO JA,CHAPIN SE,et al.Electrically generated silver ions:quantitative effects on bacterial and mammalian cells[J].Anti Microb Agents,1976,9(2):357-358.
[8]  ZHAO GJ,STEVENS SE.Multiple parameters for comprehensire evaluation of the susceptibility of Escherichia coli to the silver ion[J].Bio Met als,1998,11:27-32.
[9]  林爱红,秦彦珉,饶健.等.纳米抗菌剂抑菌杀菌性能研究[J].实用预防医学,2003,10(2):168-170.
[10]  STOIMENOV PK,KLINGER RL,MARCHIN GL,et al.Met al oxide nanoparticles as bactericidal agents[J].Langmuir,2002,18:6679-6686.
[11]  FENG QL,WU J,CHEN GQ,et al.A mechanistic study of the antibacterial effect of silver ions on Escherichia coli and Staphylococcus aureus[J].J Biomed Mater Res,2000,52:662-668.
[12]  AMRO NA,KOTRA LP,WADU-MESTHRIGE K,et al.High-resolution atomic force microscopy studies of the escherichia coli outer membrane:structural basis for permeability[J].Langmuir,2000,16:2789-2796.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133