Abstract |
Magnetite and metallic cobalt-based nanoparticles with sizes ranging from 10 to 300 nm and surface-functionalized with poly(hexamethylene biguanide) (PHMBG) are introduced as capable lipopolysaccharide (LPS)- sequestering agents. The nanoparticles efficiently bind to whole E. coli cells and can be used to separate the cells effectively from suspension using a magnet. A fluorescence dye displacement assay shows strong affinities of the nanoparticles for lipid A, the glycolipid component of LPS responsible for septic shock. The particle- lipid A affinity is of the same order of magnitude or higher than that of polymyxin B. The affinity of smaller (< 50 nm) magnetite particles modified with PHMBG to lipid A is several-fold higher than that of their larger counterparts (> 100 nm) due to their higher surface area to volume ratio. The nanoparticles possess high saturation capacity for double-stranded lambdaDNA from E. coli, with which particle- polyelectrolyte complexes are formed. The PHMBG-modified nanoparticles are potent bactericides, inhibiting E. coli viability and growth at concentrations at < or = 10 microg/mL.
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Authors | Lev Bromberg, Emily P Chang, Carmen Alvarez-Lorenzo, Beatriz Magariños, Angel Concheiro, T Alan Hatton |
Journal | Langmuir : the ACS journal of surfaces and colloids
(Langmuir)
Vol. 26
Issue 11
Pg. 8829-35
(Jun 01 2010)
ISSN: 1520-5827 [Electronic] United States |
PMID | 20155986
(Publication Type: Journal Article, Research Support, U.S. Gov't, Non-P.H.S.)
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Chemical References |
- Fluorescent Dyes
- Lipopolysaccharides
- DNA
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Topics |
- DNA
(chemistry)
- Escherichia coli
(chemistry, growth & development)
- Fluorescent Dyes
(chemistry)
- Lipopolysaccharides
(chemistry)
- Nanoparticles
- Spectrometry, Fluorescence
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