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Transformation of Escherichia coli mediated by magnetic nanoparticles in pulsed magnetic field

Paper ID Volume ID Publish Year Pages File Format Full-Text
18428 42723 2006 5 PDF Available
Title
Transformation of Escherichia coli mediated by magnetic nanoparticles in pulsed magnetic field
Abstract

A magneto-transformation method was developed for transferring plasmid DNA into Escherichia coli. Superparamagnetic nanoparticles (Fe3O4) having the saturation magnetization up to 68 emu/g were prepared by the method of co-precipitation at alkaline and thermal conditions, coated with polyethyleneimine (PEI), and then complexed with negatively charged DNA molecules. Plasmid DNA (pGEX-1λT) attached to the PEI-coated magnetic nanoparticles could be transformed into E. coli DH1 by the application of a high magnetic field in pulses. Experimental results suggested that magnetic nanoparticles could well assist DNA delivery into bacterial cells. Factors that could significantly influence the transformation efficiency included the multiple pulsing in magnetic field and concentrations of DNA and magnetic nanoparticles. The highest transformation efficiency could be achieved by pulsing for three times in the 2.15 T magnetic field. The survival declined drastically at the additional pulses. Magneto-transformation of cells with 25 μg DNA and 16 μg magnetic nanoparticles resulted in transformants number in the range from 1600 to 2480, corresponding to efficiency from 64 to 99 cfu/μg DNA. Although the yield of transformants increased with input DNA, the transformation efficiency decreased with DNA dosage. Superparamagnetic nanoparticles played a crucial role in the bacterial transformation in strong magnetic field. Increasing the amount of input magnetic nanoparticles decreased both the survival and transformation efficiency. The higher dosage of nanoparticles led to more dead cells.

Keywords
Magneto-transformation; Superparamagnetic nanoparticle; Pulsed magnetic field; Gene transfer; Escherichia coli
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Transformation of Escherichia coli mediated by magnetic nanoparticles in pulsed magnetic field
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 39, Issue 3, 3 July 2006, Pages 366–370
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us