Effect of colloidal magnetite (FeO) nanoparticles on the electrical characteristics of the azolectin bilayer in a static inhomogeneous magnetic field.

Biochim Biophys Acta Biomembr

Kotel'nikov Institute of Radio Engineering and Electronics of RAS, Mokhovaya 11-7, Moscow 125009, Russia; Faculty of Physics, Lomonosov Moscow State University, Leninskie gory, 1, building 2, 119991 Moscow, Russia.

Published: October 2024

AI Article Synopsis

  • This study investigates how applied magnetic fields and superparamagnetic nanoparticles (MNPs) affect the electrical properties of bilayer lipid membranes.
  • Key findings include an increase in membrane conductance when nanoparticles are added in a magnetic field, with potential formation of nano-sized pores.
  • Additionally, a negative current was detected at zero command voltage, likely due to nanoparticles crossing the membrane, and significant changes in capacitance linked to the surface potential and MNP binding were observed.

Article Abstract

This work is devoted to the study of the combined effects of applied magnetic field and MNPs on the electrical characteristics of bilayer lipid membranes. We present results of the study of electrical parameters of azolectin membranes in a static inhomogeneous magnetic field at the one-sided addition of positively charged quasi-spherical superparamagnetic magnetite nanoparticles with a diameter of about 4 nm. The magnet was located at different distances from the membrane, and the magnetic field attracted the nanoparticles to the membrane surface with different strengths. We observed three pronounced effects that depended on the external magnetic field. Firstly, after addition of nanoparticles in a magnetic field, the conductance of the membranes increased. A smooth increase in conductance was accompanied in some cases by the appearance of current jumps, which can be associated with the formation of through pores with a radius of no more than 1 nm. The conductance increased with increasing magnetic field gradient. Secondly, at zero command voltage, a negative current through the membrane was observed. Although our experiments did not allow us to unambiguously determine which particles create this current, we believe that this current is associated with the penetration of particles through the membrane. This effect intensified with increasing magnetic field gradient. Thirdly, we observed a sharp change in the nonlinear dependence of capacitance on voltage associated both with the change in the surface potential of the azolectin membrane and with the effect of MNP binding to the membrane surface on the apparent membrane capacitance.

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Source
http://dx.doi.org/10.1016/j.bbamem.2024.184352DOI Listing

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