Potential of magnetically responsive (nano)biocomposites

Šafařı́k, Ivo; Pospíšková, Kristýna; Horska, Katerina; Šafařı́ková, Mirka

doi:10.1039/c2sm06861c

Cited by 50 publications

(26 citation statements)

References 46 publications

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“…Cell encapsulation allows fabricating live microbial cells with magnetic nanoparticles onto cell walls, which mimicks natural magnetotactic bacteria [15]. Fabrication of such "cyborg cells" allows for magnetically-facilitated spatial manipulation with microbial cells en masse [16][17]. Artificial magnetic cells have been successfully utilized in electrochemical [18] and microfluidic biosensors [19], as well as in applications requiring the selective concentration and isolation of microbial cells [20].…”

Section: Introductionmentioning

confidence: 99%

Nanoshell Assembly for Magnet-Responsive Oil-Degrading Bacteria

2016

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The modified polyelectrolyte-magnetite nanocoating was applied to functionalize the cell walls of oil decomposing bacteria Alcanivorax borkumensis. Cationic coacervate of poly(allylamine) and 20 nm iron oxide nanoparticles allowed for a rapid single-step encapsulation process exploiting electrostatic interaction with bacteria surfaces. The bacteria were covered with rough 70-100-nm-thick shells of magnetite loosely bound to the surface through polycations. This encapsulation allowed for external manipulations of A. borkumensis with magnetic field, as demonstrated by magnetically facilitated cell displacement on the agar substrate. Magnetic coating was naturally removed after multiple cell proliferations providing next generations of the cell in the native nonmagnetic form. The discharged biosurfactant vesicles indicating the bacterial functionality (150 ± 50 nm lipid micelles) were visualized with atomic force microscopy in the bacterial biofilms.

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Section: Introductionmentioning

confidence: 99%

Nanoshell Assembly for Magnet-Responsive Oil-Degrading Bacteria

2016

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“…The attractiveness of bioseparation processes applying such agents is caused by the non-destructive nature of magnetic field, use of simple devices and particles biocompatibility, easy manipulation and regeneration (Cerff et al, 2012;Lim et al, 2012;Prochazkova et al, 2013b;Safarikova et al, 2008;Safarik et al, 2012;Safarik & Safarikova, 2009;Yavuz et al, 2009). Magnetic harvesting of microalgae by application of an external magnetic field after successful adsorption of a magnetic agent onto microalgal cells can also be viewed as a single-step process, since flocculation and separation occur simultaneously (Vandamme et al, 2013).…”

Section: Harvesting Of Microalgal Biomassmentioning

confidence: 97%

Magnetically modified microalgae and their applications

Šafařı́k

Procházková

Pospíšková

et al. 2015

Critical Reviews in Biotechnology

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The majority of algal cells can interact with a wide range of nano- and microparticles. Upon interaction the modified cells usually maintain their viability and the presence of foreign material on their surfaces or in protoplasm can provide additional functionalities. Magnetic modification and labeling of microalgal biomass ensures a wide spectrum of biotechnological, bioanalytical and environmental applications. Different aspects of microalgal cell magnetic modification are covered in the review, followed by successful applications of magnetic algae. Modified cells can be employed during their harvesting and removal, applied in toxicity microscreening devices and also as efficient adsorbents of different types of xenobiotics.

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“…Despite the fact that different types of magnetic modification procedures have been successfully used for the preparation of large number of magnetically responsive materials [6], often the conditions used during these processes (e.g., high temperature, extremes of pH value, presence of organic solvents) do not allow to use such procedures for magnetization of sensitive biological structures or enzymes and other biomolecules immobilized on solid carriers. However, several gentle procedures have been already developed, e.g., for magnetic modification of prokaryotic and eukaryotic cells; different methods such as direct or polymer-mediated deposition of magnetic nanoparticles on the cell surface have been used [7,8].…”

Section: Introductionmentioning

confidence: 99%