Journal
NANOMATERIALS
Volume 8, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/nano8110887
Keywords
magnetic nanoparticles; magnetic biosensing; Brownian relaxation; AC susceptibility; multi-core particles
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Funding
- Swedish Foundation for Strategic Research (SSF) grant FLU-ID
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We developed a novel biodetection method for influenza virus based on AC magnetic susceptibility measurement techniques (the DynoMag induction technique) together with functionalized multi-core magnetic nanoparticles. The sample consisting of an incubated mixture of magnetic nanoparticles and rolling circle amplified DNA coils is injected into a tube by a peristaltic pump. The sample is moved as a plug to the two well-balanced detection coils and the dynamic magnetic moment in each position is read over a range of excitation frequencies. The time for making a complete frequency sweep over the relaxation peak is about 5 minutes (10 Hz-10 kHz with 20 data points). The obtained standard deviation of the magnetic signal at the relaxation frequency (around 100 Hz) is equal to about 10(-5) (volume susceptibility SI units), which is in the same range obtained with the DynoMag system. The limit of detection with this method is found to be in the range of 1 pM.
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