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TitleSpherical and needle shaped magnetic nanoparticles for friction and magnetic stimulated transformation of microorganisms
Author(s)Mendes, Gabriel Pinto
Kluskens, Leon D.
Mota, M.
Lanceros-Méndez, S.
Hatton, T. Alan
KeywordsMagnetic nanoparticles
Verwey transition
Yoshida effect
Issue dateApr-2021
PublisherElsevier BV
JournalNano-Structures and Nano-Objects
CitationMendes, Gabriel Pinto; Kluskens, Leon D.; Mota, Manuel; Lanceros-Méndez, S.; Hatton, T. Alan, Spherical and needle shaped magnetic nanoparticles for friction and magnetic stimulated transformation of microorganisms. Nano-Structures and Nano-Objects, 26(100732), 2021
Abstract(s)Spherical and needle shaped magnetic nanoparticles (MNPs) were synthesized by thermal decomposition, functionalized with 2-pyrrolidinone for the attachment of pUC19 plasmidic DNA and used in transformations assays of Escherichia coli JM109. Frictional and magnetic stimulation were employed for promoting the translocation of the nanoparticle-pUC19 complexes across the cell envelope. Transformants were obtained through frictional stimulation using needle shaped MNPs achieving a maximum transformation efficiency of 3.1 × 102 CFU/g pUC19. Magnetic stimulation was also performed using both types of nanoparticles under conventional magnetofection conditions on a magnetic bioreactor and did not induce transformation of E. coli JM109, possibly due to the field intensity at the region of the cells (100 mT) not being high enough to overcome the rigidity of the bacterial cell envelope. This work substantiates the need for the delivery agent to have a high aspect ratio in order to achieve transformation of prokaryotes. Moreover, it highlights the limitations of magnetic stimulation for translocation of MNPs across the microbial cell wall, as opposed to magnetofection of eukaryotic cells whereby the entry of genetic material can be readily accomplished using spherical MNPs through an endocytotic uptake mechanism.
DescriptionSupplementary material related to this article can be found online at
Publisher version
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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