Detection of rolling circle amplified DNA molecules using probe-tagged magnetic nanobeads in a portable AC susceptometer.

de la Torre TZ, Mezger A, Herthnek D, Johansson C, Svedlindh P, Nilsson M, Strømme M

Biosens Bioelectron 29 (1) 195-199 [2011-11-15; online 2011-08-22]

Here, the volume-amplified magnetic nanobead detection assay (VAM-NDA) is for the first time applied for detection of rolling circle amplified (RCA) DNA molecules in a portable, commercial AC susceptometer that operates at ambient temperatures and with an analysis time of about 20 min. The performance of the assay is investigated using three different magnetic nanobead sizes: 50, 130 and 250nm. The performance of the assay using the AC susceptometer is compared to the performance achieved using a superconducting quantum interference device (SQUID). It is found that the performance of the assay is comparable in the two setups with a quantitative detection limit of ∼4pM for all bead sizes under study. The findings show that the VAM-NDA holds promise for future wide-spread implementation in commercial AC susceptometer setups thus opening up for the possibility to perform magnetic bead-based DNA detection in point-of-care and outpatient settings.

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PubMed 21907556

DOI 10.1016/j.bios.2011.08.019

Crossref 10.1016/j.bios.2011.08.019

S0956-5663(11)00543-4